| Abbreviation or symbol | Definition | Description |
0-9 [edit] |
A [edit] |
| Ac | beyond corners | Commonly used when measuring the corners of a hex bulldoze, such as a hex nut. |
| AF | across flats | Commonly used when measuring the flat surfaces of a hex drive, such as a hex nut. |
| AFF | above finished floor | A dimension that establishes a distance away from the finished flooring. Example would be the top of a java table to the shag of the carpet, not where the bottom of the tables feet dig in. |
| AISI | American Iron and Steel Institute | The AISI acronym is commonly seen as a prefix to steel grades, for example, "AISI 4140". The SAE steel grade organisation was formerly a joint AISI-SAE system. |
| Al or AL | aluminium | |
| ALY | alloy | |
| AMER | American | Referring to the U.s.a. |
| AMS | Aerospace Material Standards | Standards in materials scientific discipline and engineering maintained by SAE International and widely used in the aerospace manufacturing industries. |
| AN- | Regular army-Navy | A prefix for standard hardware (itemize hardware) ID numbers. Came from the era of circa 1890s-1945, when the U.S. Army and Navy were leading the way on product standardization for logistics improvement, yielding the The states Military Standards system. Today manufacture and ISO also practice a lot of this standardization specification, freeing the U.S. DOD and military to do less of it (as explained at United States War machine Standard > Origins and development), although many MIL standards are still electric current. (See also MS- and NAS.) |
| ANN | anneal, annealed | |
| ANSI | American National Standards Found | And the many standards that information technology bug, for example, ANSI Z87.1. |
| APPROX [two] | approximately | |
| AQL | adequate quality level | The threshold of defectiveness that is allowable in a group of parts. Information technology is trivial to say that no one wants any error, and that anybody wants compatible perfection; only in the existent earth, it almost never happens. The intelligence behind defining AQLs is in figuring out how much mistake is tolerable given the costs that would be incurred past whatever efforts to further reduce its incidence. |
| AR | as required | An abbreviation used in parts lists (PLs, LMs, BoMs) in the quantity-per-associates field when a discrete count is non applicative. For example, in an assembly with a bolted articulation using four bolts, the PL quantity column volition say "4" for the bolt PN, "4" for the nut PN, and "AR" for the liquid threadlocker that volition be applied. |
| AS | Aerospace Standards; Australian Standards | one. Aerospace Standards, technical standards maintained past SAE International and widely used in the aerospace manufacturing industries. Standard aerospace hardware sometimes has the Every bit- prefix in the catalog numbers. ii. Australian Standards, standards per Australian industry. |
| Equally, APS, APV, AV, APSL, AVL | approved product supplier, canonical vendor, approved-product-supplier list, approved-vendor list | When only certain companies are approved past the CDA to industry the product (that is, to make what the cartoon depicts/defines), they are called by names such as "approved supplier", "approved product supplier", "canonical vendor", or "canonical product vendor". The listing of such companies (which usually changes over fourth dimension) is called an APSL, AVL, or like names. Vetting the companies on this listing requires the CDA to audit (and possibly periodically re-audit) the companies, which incurs an overhead expense for the CDA. Therefore, smaller companies will often cite larger companies' lists in order to avoid the toll of duplicating the try. |
| ASA | American Standards Clan | Former proper name for ANSI (1920s-1960s). |
| ASME | American Society of Mechanical Engineers | And the many standards that it issues, for example, ASME Y14.v. |
| ASSY or ASY | associates | referring to an assembly of parts rather than just ane (sub)office ("piece office", "detail part"). |
| ASTM | Formerly the American Lodge for Testing and Materials; now ASTM International | Maintains technical standards, especially regarding materials science and engineering and metrology. |
| AVG | average | |
| AWG | American Wire Gauge | |
B [edit] |
| BASIC | basic dimension | A bones dimension is i that is the theoretical value without any tolerance range. It does not serve as an acceptance criterion. It is thus similar in some respects to a reference dimension. The reason why a basic dimension does non acquit a tolerance is that its actual value will fall (passably) wherever it is put by other features' actual values, where the latter features are the ones with tolerances defined. A common and simple instance is hole location: If a hole's centerpoint location has a position tolerance, then the centerpoint'south coordinates practise non demand (and should non accept) split tolerances applied to them. Thus they are instead given as basic dimensions. In modern practice bones dimensions have a rectangular box around them, or sometimes the give-and-take "Bones". |
| BC or B.C. | bolt circle | |
| BCD or B.C.D. | bolt circumvolve diameter | |
| BHC | bolt pigsty circle | Same definition equally the bolt circle diameter |
| BHCS | button caput cap screw | Like an SHCS but with a button head. |
| BHN | Brinell hardness number | |
| BoM or BOM | bill of materials | Likewise called a list of materials (LM or L/M). Overlaps a lot in concept with a parts list (PL or P/50). There is no consistently enforced distinction between an L/Thousand, a BoM, or a P/L. |
| BoP or BOP | bought out part | A part which is outsourced from an external supplier, or "bought out". |
| BP , B/P | blueprint | "per B/P" = "per drawing" |
| BRZ | bronze | |
| BSC | basic dimension | Run across basic dimension info above. |
C [edit] |
| CAD | computer-aided design, computer-aided drafting; cadmium [plating] | |
| Muzzle | Commercial and Government Entity [code] | A Cage lawmaking is a unique identifier to label an entity (that is, a specific government agency or corporation at a specific site) that is a CDA, ODA, or MFR of the office defined by the drawing. Ane corporation can have many CAGE codes, equally can one authorities, considering each segmentation, department, and site (campus) can have its ain CAGE lawmaking. The same CAGE code can alter owners over the years. For example, a CAGE code that formerly referred to a certain Martin Marietta site will now refer to Lockheed Martin at that same site (although the buildings may take been replaced and the signage may say different names). |
| C-C or C-TO-C | eye-to-centre; on centres | Defines centre-to-centre distance of two features, such as two holes. |
| CBN | cubic boron nitride | A textile from which some cutter inserts are made. |
| CDA | electric current design activity | The CDA is the entity (whether it be a corporation, a unit of a national armed services or ministry of defence, or another civilian government agency) that currently has design authority over the part blueprint (definition). Information technology may be the entity who get-go designed the function (that is, the ODA), but today information technology is besides probable to be a designated successor entity, owing to mergers and acquisitions (M&A) action (east.k., ODA company was bought by CDA company); contract letting (e.g., an Regular army engineering department ODA turns over the design activity to the prime contractor that makes well-nigh or all of the parts, turning that contractor into the new CDA); privatization (eastward.thousand., a authorities privatizes the blueprint and manufacture of materiel, and a country arsenal [land armory] ODA transfers design authority to a private arsenal [defense contractor] ODA); or patent licensing (east.one thousand., a patent-holding inventor [ODA] licenses i or several companies to manufacture products using his intellectual property, in which case the "same" part could end up with multiple design regime, although they may not be considered the official/nominal CDA). |
| CERT or cert | certification | For example, certification of metallurgical content and processes |
| CG | centerless basis, centerless grinding | |
 | Center mark | Defines the center of a circle or partial circle. |
| CH or CHAM | chamfer | |
| CI | cast iron | No longer a commonly used abbreviation. Ameliorate to spell out for clarity. |
| CL or ℄ | centreline or centerline; class | 1. Center line, the central centrality of a characteristic. 2. Form, for instance, "paint per spec XYZ revision C blazon 1 class 2" may be abbreviated as "paint per spec XYZ REV C TY ane CL 2" or even in some cases "paint per spec XYZ-C-1-2". (The latter practice is not uncommon but is cryptic for workers with minimal training and experience. The first two options are better practice.) |
| CNC | estimator numerical command | |
| CR | controlled radius | Radius of an arc or circle, with no flats or reversals. This strict version of radius definition is specified in demanding applications when the form of the radius must exist controlled more than strictly than "but falling within the dimensional tolerance zone". It is poor applied science to specify a CR instead of an R just on the theory of enforcing proficient workmanship. CR is for critical features whose performance truly requires near-perfect geometry. Like most such characteristics, its presence increases the cost of the office, because it raises the costs of manufacturing and quality assurance. |
| CRES | corrosion-resistant [steel] | Largely synonymous with stainless steel, unless specific grades, specs, and distinctions are fabricated on the drawing. Some people treat CRES equally a subset of the stainless steels. |
| CRS | cold rolled steel; on centres | Defines middle-to-centre altitude of two features, such as two holes. |
| C/T | Correlation / Tracking | |
C'BORE or CBORE or  | counterbore | |
CSK or CSINK or  | countersink | |
| CTN, ctn | carton | |
D [edit] |
 | depth, deep, down | Defines the depth of a feature. |
| ⌀ [2] | diameter | Bore of a circle. In a characteristic command frame (FCF), the ⌀ symbol tells you that the tolerance zone for the geometric tolerance is cylindrical. Abbreviations for "diameter" include ⌀, DIA, and D. |
| D | diameter; delta | Abbreviations for "diameter" include ⌀, DIA, and D. For delta usage, run across for example "delta notes". |
| DIA [ii] | diameter | Diameter of a circle. Abbreviations for "diameter" include ⌀, DIA, and D. |
| DIP | ductile atomic number 26 pipage | |
| DIM | dimension, dimensioning | |
| Practice , do | ditto | Seen occasionally in older drawings instead of repeating a given dimension. |
| DOD , DoD | [U.Due south.] Department of Defense force | Run into also Mod. |
| DPD | digital production definition | A synonym of MBD. |
| DWG , dwg | cartoon | Referring to the engineering drawing |
E [edit] |
| ED | edge distance | Drilled holes, and fasteners are unremarkably required to have a minimum edge altitude (min ED). |
| EO , ECO, ECN | applied science order | An order from the engineering department (to be followed past the product department or vendor) overriding/superseding a item on the cartoon, which gets superseded with revised information. Also called by diverse other names, such as engineering change lodge (ECO), engineering modify observe (ECN), cartoon change observe (DCN), and then on. Encounter also REV. |
| EQL , EQ | equal, equally | For example, "⌀10 4X EQL SPACED ON BC" means "drill four holes of 10mm bore equally spaced around the bolt circumvolve." |
| ERC | electrical rule check | |
| Exist. | existing | |
F [edit] |
| f | cease | An italic f (Latin small alphabetic character f) written on a line representing a surface was an one-time way of indicating that the surface was to be machined rather than left in the as-bandage or every bit-forged land. The "f" came from "finish" in the sense of "automobile finish" as opposed to raw stock/casting/forging. Later the ASA convened upon a letter 5 (specifically a sans-serif V) touching the surface. Soon this evolved into the "bank check marker" sign with accompanying number that tells the reader a max roughness value (RMS, microinches or micrometres) for the machined finish, to exist measured with a profilometer. |
| FAO | finish all over | A note telling the manufacturer that all surfaces of the part are to be machined (every bit opposed to leaving any surfaces as-bandage or every bit-forged). Not an obsolete usage, but not seen as commonly as it was decades ago; not least because parts that once would take been spot-faced castings are at present likelier to be contoured from barracks with CNC milling. Merely more than importantly, best engineering practise today, reflecting design for manufacturability and avoidance of spurious cost drivers, is either to specify specific, quantifiable requirements for surfaces with specific needs (such as RMS roughness measurements in microinches or micrometres, plus any plating or painting needs), or to get out finish out of the part definition (and thus at the manufacturer's discretion) because it is non of import to fit, office, or criticality. This same spirit is behind the shift in military standards from writing requirements well-nigh methods to writing them instead about performance, with the method to reach that goal beingness up to the ingenuity of the designer. |
| FCF | feature control frame | The rectangular box (with several cells) that conveys geometric tolerances in GD&T. Information technology typically tells you what sort of geometric status (e.k., parallel, perpendicular, circular, concentric), followed past what size (and perhaps shape) the tolerance zone is, and finally which datums it relates to, the order of gaging confronting them, and what material condition applies to them (LMC, MMC, or RFS). A bore symbol (⌀) tells you that the zone for the geometric tolerance is cylindrical. |
| FD or F/D | field of the drawing | The [main] field of the cartoon, as opposed to other areas of information technology, such equally the parts list (P/L), general notes (G/Due north), flagnotes (F/Northward or FL), title block (T/B), rev block (R/B), pecker of materials (B/M or BoM or BOM), or list of materials (Fifty/M). Rationales for drawing changes that are noted in the rev block often use these abbreviations for brevity (eastward.g., "DIM 14.00 was 12.50; added default TOL info to T/B; added leader lines to F/D; added alternate hardware IDs to P/L; added alternate alloy to L/M"). |
| FIM | total indicator move | See as well TIR. |
| FL | flag annotation, flagnote | A note that is called out in specific spots in the field of the drawing. Information technology is numbered with a stylized flag symbol surrounding the number. A full general note applies generally and is non called out with flags. |
| FL | Flooring Level | Floor Level of an existing or proposed building or concrete pad |
| FN or F/N | flag note, flagnote; find number | i. Flagnote: A flagnote is a note that is called out in specific spots in the field of the drawing. It is numbered with a stylized flag symbol surrounding the number (or sometimes a delta symbol). A general note applies mostly and is not called out with flags. 2. Find number: "FN" significant "find number" refers to the ordinal number that gives an ID tag to one of the constituents in a parts list (listing of materials, nib of materials). Thus "spike using FN7" refers to a fastener that is "notice number" 7 in the list. |
| FoS | characteristic of size | A type of physical feature on a part. An FoS is a characteristic that can have size associated with it, usually involving the opposition of 2 surfaces (east.g., the ii diametrically contrary sides of a hole wall; the two contrary walls of a slot or flange). Features of size (FoSs) in reality always have actual sizes and forms that differ from their theoretical size and course; the purpose of tolerancing is to define whether the deviation is adequate or non. Thus material condition (LMC, MMC, somewhere in between, or RFS) is important in GD&T. ) A given geometric tolerance may be defined in relation to a certain FoS datum being at LMC or at MMC. |
| FPSO | Floating Production Storage and Offloading | An FPSO is a floating product system that receives fluids (crude oil, h2o and a host of other things) from a subsea reservoir through risers, which then split up fluids into rough oil, natural gas, water and impurities within the topsides production facilities onboard. Rough oil stored in the storage tanks of the FPSO is offloaded onto shuttle tankers to go to market place or for further refining onshore. FPSO and FSO (Floating Storage and Offloading) systems today have become the principal method for many offshore oil and gas producing regions effectually the earth |
| FS | far side | The drawing notations "near side" and "far side" tell the reader which side of the part a feature is on, in occasional contexts where that fact is not communicated using the rules of projection alone. Contexts of usage are rather limited. Ane example is hole locations; "3X AND 3X FAR SIDE" defines symmetrical groups of 3 holes on both sides of a part (6 total), without having to redefine equivalent pigsty center coordinates on two carve up views, 1 for each grouping. This is not just a convenience for the designer merely also a method of error prevention, considering it provides a way to avoid forking geometric definition that ideally should be kept unforked to prevent discrepancies. For example, the groups defined above cannot accidentally go asymmetrically discrepant in a future revision by the revisor failing to revise both groups equally (because their definition is unified in but one place). Another example is part marking locations. An surface area for part identification mark can be circled on a top view only assigned to either the top or lesser of the part only with a "near side" or "far side" note—which obviates adding any otherwise-unneeded bottom view to the field of the cartoon. |
| FSCM | Federal Stock/Supply Code for Manufacturers | An older proper name for "Cage lawmaking". Also NSCM (National Stock/Supply Code for Manufacturers). |
| FTG | fitting | |
G [edit] |
| GCI | gray cast fe | |
| GD&T or GDT | geometric dimensioning and tolerancing | A standardized language for defining and communicating dimensions and tolerances. |
| GN or Thou/N | general note(s) | Well-nigh engineering drawings have a notes list, which includes both general notes and flag notes. |
H [edit] |
| HBW | hardness, Brinell, tungsten tip | See Brinell scale. (The "West" comes from the element symbol for tungsten, W, which comes from the High german Wolfram.) |
| HDPE | high-density polyethylene | |
| HHCS | hex head cap spiral | |
| HRA | hardness, Rockwell, A scale | See Rockwell scale. |
| HRB | hardness, Rockwell, B scale | Encounter Rockwell scale. |
| HRC | hardness, Rockwell, C scale | Run across Rockwell scale. |
| HRS | hot rolled steel | |
| HT TR | heat treat, heat treatment | |
| H&T or H/T or HT | hardened and tempered | A form of estrus handling in which the metal is start hardened and then tempered. Compare N&T. |
I [edit] |
| IAW | in accordance with | A common need in engineering science drawings is to instruct the user to exercise activity X in accordance with technical standard Y. For example, "Weld all subassemblies IAW AWS XYZ.123" ways "Weld all subassemblies in accordance with American Welding Society standard number XYZ.123" (the number is hypothetical in this case). The give-and-take "per" is functionally equivalent to "IAW" in such contexts; thus "rivet all sheet metal per MIL-PRF-123456" or "[...] IAW MIL-PRF-123456". Part of the motivation behind the choice of words "in accordance with" is that they do non allege that whatsoever particular activity is explicitly specified by standard XYZ.123 (which "per" could exist interpreted as alleging, at least in connotation); rather, these words merely instruct the user that whatever south/he does must not contradict the standard in whatever way. Just this is a subtle connotative distinction, and "per" and "IAW" are denotatively equivalent. |
| ID | inner diameter; identity, identification number | |
| IED | Insufficient Edge Altitude | Drilled holes usually have a required minimum edge altitude, if the inspection finds that the edge distance is below minimum, then commonly reported as having an IED condition. |
| ISO | International Arrangement for Standardization | And the many standards that it specifies, for instance, ISO 10303 |
J [edit] |
| JIS | Japan Industrial Standard | Reference to standards published by the Japanese Standards Association |
K [edit] |
| KEY | key | Drawing callouts marked "KEY" define "central characteristics" that are considered especially important for fit, office, safety, or other reasons. They are thus subjected to higher inspection sampling levels. |
| KPSI , kpsi | kilopounds per foursquare inch, that is, thousands of pounds per foursquare inch | See word at synonym KSI. |
| KSI , ksi | kilopounds per foursquare inch, that is, thousands of pounds per square inch | KSI (or ksi), also abbreviated KPSI or kpsi, is a common non-SI measurement scale for ultimate tensile strength, that is, the number of units of tensile force that a material can endure per unit of cantankerous-sectional area earlier breaking. In the SI system, the unit is the pascal (Pa) (or a multiple thereof, often megapascals (MPa), using the mega- prefix); or, equivalently to pascals, newtons per square metre (North/k2). |
L [edit] |
| LDD | limited dimension drawing | An implementation of model-based definition that however uses a 2D drawing, but only containing critical information. All information missing from the drawing is to be pulled from a 3D model of the part or assembly. |
| LH | left-hand | Referring to handedness, such as the helix handedness of spiral threads or the mirror-image handedness of a symmetrical pair of parts. |
| LM or Fifty/Yard | list of materials | Too chosen a neb of materials (BoM, BOM). Overlaps a lot in concept with a parts listing (PL or P/L). In that location is no consistently enforced distinction between an L/M, a BoM, or a P/L. |
| LMC | to the lowest degree material condition | A fabric status in GD&T. Means that a feature of size (FoS) is at the limit of its size tolerance in the direction that leaves the least material left on the function. Thus an internal feature of size (e.g., a hole) at its biggest diameter, or an external feature of size (due east.g., a flange) at its smallest thickness. The GD&T symbol for LMC is a circled 50. (See likewise MMC and RFS.) A given geometric tolerance may be divers in relation to a certain FoS datum being at LMC or at MMC. |
M [edit] |
| MACH | motorcar; machined | |
| MAJ | major | As in major bore, or major characteristic (for sampling level) |
| MAX [2] | maximum | |
| MBD | model-based definition | Definition of the part via a 3D CAD model rather than via a 2d engineering science drawing. Drawings may be printed (plotted) from the model for reference use, but the model remains the governing legal musical instrument. |
| MBP | measurement between pins | threads, splines, gears (internal, female) (synonymous with MBW) (see also MOP, MOW) |
| MBW | measurement betwixt wires | threads, splines, gears (internal, female) (meet likewise MBP, MOP, MOW) |
| MF or Yard/F | make from | When one role number is made from some other, it means to take part A and automobile some boosted features into information technology, creating part B. The parts list or L/M, in the "cloth" field, will say "M/F PN 12345". |
| MFD | manufactured | |
| MFG | manufacturing | |
| MFR | manufacturer | May be the aforementioned entity as the CDA or ODA, or may not exist. |
| MIL- | [U.Southward.] Military | A prefix for the names of various United States Military Standards and Specifications, for example, MIL-STD-*, MIL-SPEC-*, MIL-DTL-*, MIL-PRF-*, MIL-A-*, MIL-C-*, MIL-S-*, MIL-STD-1913, MIL-STD-1397. |
| MIN [two] | minimum; minutes; pocket-size | |
| MMC | maximum cloth condition | A material condition in GD&T. Means that a feature of size (FoS) is at the limit of its size tolerance in the direction that leaves the about material left on the function. Thus an internal feature of size (e.one thousand., a pigsty) at its smallest bore, or an external feature of size (e.grand., a flange) at its biggest thickness. The GD&T symbol for MMC is a circled Thou. (Come across too LMC and RFS.) A given geometric tolerance may be divers in relation to a sure FoS datum beingness at LMC or at MMC. |
| Mod , MoD | Ministry of Defence [U.Thou. and others] | See also DOD. |
| MOP , MoP | measurement over pins | threads, splines, gears (external, male person) (synonymous with MOW, measurement over wires) |
| MOW , MoW | measurement over wires | threads, splines, gears (external, male) (see also MBW, MBP, MOP) |
| MPa , MPA | megapascals | The common SI measurement calibration for ultimate tensile forcefulness (UTS), that is, the number of units of tensile force that a material tin can endure per unit of cross-sectional area before breaking. At that place is only one correct casing for the symbol, cap-M-cap-P-small-a, which, like any SI unit of measurement symbol, properly should be preserved even when surrounding text is styled in all caps (which latter is a oft employed tradition in engineering drawing). Simply it is not uncommon to see "MPA" through carelessness. Users are not dislocated regardless. In non-SI terms, the unit for UTS is the KSI (or ksi), which see herein. |
| MRB | material review board | A committee that reviews some nonconforming materials which are submitted as potentially still usable/saleable (if the nonconformance does not hinder fit or function). |
| MS- | [U.S.] Armed services Standard | Standards established by the U.S. military and widely used in the aerospace manufacturing (military and civil) and other defense industries. Standard hardware sometimes uses the MS- prefix in the catalog numbers. (Run into also AN- and NAS.) |
N [edit] |
| NAS | National Aerospace Standards | Standards maintained by SAE International and widely used in the aerospace manufacturing industries. The "National" formerly implicitly referenced the U.s.a., just today NAS and other standards are used globally. Standard hardware for aerospace piece of work sometimes uses the NAS- prefix in the catalog numbers. (Encounter also AN- and MS-.) |
| NC | National Fibroid; numerical control | The [U.S.] National Coarse serial of pre-1949 corresponds today to the Unified National Coarse (UNC) of the Unified Thread Standard. |
| NCM | nonconforming fabric(southward) | This abbreviation is used in a machine shop when recording nonconformances (out of tolerance, etc.). For instance, "An NCM tag was tied to the flake function." |
| NCR | nonconformance written report | A report listing nonconformances (out of tolerance, etc.). Helps to clarify system weaknesses (such as worn-out equipment, operators in need of more preparation, or risky practices). |
| NEC | non elsewhere classified; National Electric Code | In the sense of "non elsewhere classified", the abbreviation is well known within certain fields, merely not others; to avoid defoliation, spell out. The National Electrical Code is a standard for electrical work. |
| NEF | National Actress Fine | The [U.S.] National Extra Fine series of pre-1949 corresponds today to the Unified National Actress Fine (UNEF) of the Unified Thread Standard. |
| NF | National Fine | The [U.S.] National Fine series of pre-1949 corresponds today to the Unified National Fine (UNF) of the Unified Thread Standard. |
| NL or N/Fifty | notes list | A list of notes that appears somewhere on the drawing, often in the upper left corner. |
| NOM [2] | nominal | |
| NORM or NORMD | normalized | referring to normalization, a stress-relieving heat treatment. See also HT TR. |
| NPS | Naval Primary Standard[three] | (Not to be confused with annotating strait pipe as "NPS", which should instead be annotated NPSM, NPSL, or NPSH[4]) |
| NPT | National Pipage Taper | A subset serial of the Unified Thread Standard. |
| NS | National Special; nearly side | 1. National Special, a spiral thread series; run across Unified Thread Standard. An extensible serial, covering various special threads. two. Most side: The drawing notations "almost side" and "far side" tell the reader which side of the part a feature is on, in occasional contexts where that fact is not communicated using the rules of projection alone. Contexts of usage are rather limited. See "far side" for examples. |
| NSCM | National Stock/Supply Code for Manufacturers | An older name for "CAGE code". Also FSCM (Federal Stock/Supply Code for Manufacturers). |
| N&T or N/T or NT | normalized and tempered | A grade of rut handling in which the metal is first normalized (stress-relieved) then tempered. Compare H&T. |
| NTS | not to calibration | See also Engineering drawing > Calibration. |
O [edit] |
| OAL | overall length | |
| OC | on eye(s) | That is, heart-to-heart; defines centre-to-eye altitude of two features, such as 2 holes. |
| OD | outer diameter | |
| ODA | original design activity | The entity that originally designed a function. Compare to CDA, the entity that currently has design authority over the part design (definition). |
| OHL | over high limit | This abbreviation is used in a machine store when recording nonconformances. For case, "role scrapped because ID is OHL." See also ULL. |
| OPP | opposite | See Part number > Symmetrical parts for explanation. |
| ORIG | original | |
P [edit] |
| pc, pcs | piece, pieces | |
| PD | pitch diameter | |
| PDM , PDMS | product data management, product data manager [app], product information management organization [app] | A database(s) and related application(southward) that facilitate all aspects of managing data files—e.g., TDPs, TDP versions, drawings, model datasets, specs, addenda, certs, memoranda, EOs, ECOs, DCNs, RFQs, quotes, POs, due east-mails, faxes, photos, give-and-take processor documents, spreadsheets. See also PLM. |
| PH or P/H | atmospheric precipitation hardening, atmospheric precipitation-hardened; pilot hole | |
| PHR BRZ | phosphor bronze | |
| PL or P/L | parts list | A list, usually tabular and often on the drawing (if not accompanying the drawing on a separate sail), listing the parts needed in an associates, including subparts, standard parts, and hardware. There is no consistently enforced distinction between an L/M, a BoM, or a P/Fifty. |
| PLM | product lifecycle management; plant lifecycle direction | See also PDM. |
| PMI | Product and manufacturing data | Product and manufacturing information conveys non-geometric attributes in 3D estimator-aided blueprint (CAD) and Collaborative Production Development systems necessary for manufacturing product components and assemblies. |
| PN or P/North | part number | |
| POI | point of intersection | A point that makes easier the layout, toolpath programming, or inspection of the function. It is the intersection signal of lines that may not run across on the finished part, such as the tangent lines of a curve or the theoretical sharp corner (TSC) that edge-breaking and deburring will remove. Meet likewise SC, TSC, and Air-conditioning. |
| P.F. | printing fit | A fastening or mating between two parts which is accomplished past friction afterwards the parts are pushed together. |
| PSI | pounds per square inch | A unit for pressure. Encounter also KSI. |
| PTFE | polytetrafluoroethylene | Also well known past the brand name Teflon. |
| PVC | polyvinyl chloride | |
Q [edit] |
| QMS | quality management system | A organization in place to ensure that quality of industry is produced and maintained; a system to forestall defective parts from being fabricated, or, even if made, from getting into finished inventories. |
| QTY or qty | quantity | |
R [edit] |
| R | radius | Radius of an arc or circle. Flats and reversals (falling within the dimensional tolerance zone) are tolerated unless "CR" (controlled radius) is explicitly specified. |
| RA , Ra | roughness, average; Rockwell A calibration | See surface roughness; run into Rockwell scale. |
| RB , Rb | Rockwell B scale | Run into Rockwell scale. |
| RC , Rc | Rockwell C scale | See Rockwell scale. |
| REF or ( )[2] | reference dimension | Meet Reference dimension. On a technical drawing a dimension or notation that is given but for reference and therefore is not intended to be used as a part acceptance criterion (although it may be used equally an aid to production or inspection). Parenethesis( value ) denote the aforementioned thing and were standartized past ASME. When a dimension is divers in one view but as well mentioned again in another view, it will be given as reference in the 2nd case. This rule prevents the mistake of defining information technology in two different ways accidentally; the "primary" (non-reference) mention is the only one that counts as a characteristic definition and thus as a office acceptance criterion. See also basic dimensions, which are like in some respects. |
| REQD or REQ'D | required | For example, "4 REQD" written side by side to a fastener ways that four of those fasteners are required for the assembly. |
| REV | revision | Engineering drawings and textile or process specifications are often revised; the usual revision control convention is to label the versions A, B, C, D, etc.; a revision cake (rev cake) is a tabular area on the drawing (typically in the upper right corner) that lists the revision letters, a brief clarification of the changes and reasons, and blessing initials and dates. Revisions beyond "Z" start the alphabet over once again with doubling, e.grand., AA, AB, AC, AD, then on. In the days of manual drafting, redrawing was expensive, so engineering orders (EOs, ECOs, DCNs, ECNs) were not always incorporated into a next-letter revision. They thus accompany the drawing as office of the TDP. With the dissemination of software usage (CAD, CAM, PDMSs), revision control is often improve handled nowadays, in competent hands at to the lowest degree. In recent years the revision control of engineering drawings has even been standardized by ASME, in their standard Y14.35M.[v] |
| RFS | regardless of characteristic size | A textile condition (or more precisely, freedom from such) in GD&T. Means that a given geometric tolerance is true in relation to a sure datum regardless of its actual size (LMC ≤ actual size ≤ MMC). |
| RH | right-hand | Referring to handedness, such as the helix handedness of spiral threads or the mirror-prototype handedness of a symmetrical pair of parts. |
| RHR | roughness height reading | Meet surface roughness. |
| RL | Reduced Level or Relative Level | Surface Level |
| RMA | render material authority | Come across also RTV. |
| RMS | root mean square | RMS in general is a statistical technique to define a representative value for a grouping of data points. With regard to surface roughness, information technology means that the heights of the private microscopic peaks and valleys shall be averaged together via RMS to yield a measurement of roughness. See too herein f every bit a finish mark. |
| RT or R/T | rough turn, crude turned; room temperature | Rough-turned ways turned on a lathe only not finished to a final machined dimension and surface roughness. Can apply to bar stock or to parts in-procedure. Room temperature is sometimes abbreviated "RT" within tables of specs for finishing operations (plating, painting, etc.). |
| RTP | release to production | The issuance of a cartoon from the applied science/pattern activity to the production activity. In other words, the effect when a draft becomes a completed, official certificate. A stamp on the drawing proverb "ISSUED" documents that RTP has occurred. |
| RTV | room-temperature vulcanizing; render to vendor | 1. RTV sealants, a way to seal joints. 2. Render to vendor, send parts back to a vendor for rework or refund because they are nonconforming. Such RTV frequently requires an RMA. |
| RZ , Rz | roughness, mean depth | Encounter surface roughness. |
S [edit] |
| SAE | Formerly the Guild of Automotive Engineers; now SAE International | And the many standards that information technology issues, for example, the SAE AMS and SAE Every bit standards serial. |
| SC or S/C | abrupt corners | Dimensions may be given as "across sharp corners" although the corners go radiused. In other words, distances may be given from intersection points where lines intersect, regardless of edge breaks or fillets. This is usually implied past default, so "Southward/C" oft need not be explicitly added. But in some cases it clarifies the definition. See also TSC, POI, and AC. |
| SF or South/F | spotface slip fit | |
| SFACE or S/Face up | spotface | |
| SHCS | socket head cap spiral | A cap screw with a socket caput (ordinarily implying a hex socket, driven with a hex cardinal. |
| SHN | shown | Run into Function number > Symmetrical parts for explanation. |
| SHSS | socket head gear up spiral | A gear up screw with a socket head (ordinarily implying a hex socket, driven with a hex key. |
| SI | Système international [d'unités] [International System of Units] | The metric system in its current course (latest standards). |
| SN or Southward/N | serial number | |
| SOL ANN | solution anneal, solution annealed | |
| SPEC or spec | specification | |
| SPHER ANN | spheroidize anneal | |
| SPOTFACE | Spot facing | |
| SR | spherical radius | Radius of a sphere or spherical segment. |
| SS or S/S | stainless steel; supplant | i. Stainless steel, see also CRES. 2. Supersede/supersedes/superseded, refers to when one document (specification, standard, drawing, etc.) replaces (supersedes) another (see also revision control). |
| SST | stainless steel | Equally per Y14.38–2007 |
| STD | standard | |
| Footstep | Standard for the Eastxchange of Product Model Data | A standard format defined by ISO 10303 for MBD data generation, storage, and substitution. |
| STA | solution treated and anile | |
| STI | screw thread insert | |
| STL | steel | |
| STK | stock | A nominal dimension for the stock textile, such as bar stock |
| SW | Schlüsselweite | Translates as Key or Wrench Width. Width across flats, oft found on drawings of German origin. |
T [edit] |
| TAP | tapped hole | Usually implies drilling a hole if the hole does not already be. |
| TB or T/B | championship block | An area of the drawing, almost always at the lesser right, that contains the title of the drawing and other key information. Typical fields in the championship block include the drawing title (usually the role proper noun); drawing number (usually the part number); names and/or ID numbers relating to who designed and/or manufactures the part (which involves some complexity because blueprint and manufacturing entities for a given function number ofttimes change over the years due to mergers and acquisitions, contract letting, privatization, and the buying and selling of intellectual holding—see CDA and ODA); company proper noun (see previous comment); initials/signatures of the original draftsman (every bit wells as the original checker and tracer in the days of manual drafting); initials/signatures of approval managers (issuance/release-to-product information); cross-references to other documents; default tolerancing values for dimensions, geometry, and surface roughness; raw-material info (if not given in a separate list/bill of materials); and access control information (information most who is authorized to possess, view, or share copies of the data encoded by the cartoon, eastward.thousand., classification notices, copyright notices, patent numbers). Drawing revision (versioning) information is not always included in the championship block because it often appears in a separate revisions block. |
| TCC | fourth dimension-electric current curve | |
| TDP | technical data package | The complete parcel of data that defines a part, of which the cartoon itself is oft only a subset. It also includes applied science orders (cartoon change notices), 3D model datasets, information tables, memoranda, and any special weather condition called out by the buy order or the companies' terms-and-weather condition documents. |
| THD or thd | thread | |
| THRD | threaded | |
| THK or thk | thickness | |
| THRU | through | Optionally applied to a hole dimension to signify that the hole extends through the workpiece. For example, THRU may be stated in a hole dimension if the hole's terminate condition is non clear from graphical representation of the workpiece.[vi] |
| THRU ALL | Through all | Similar to THRU. Sometimes used on pigsty dimensions for clarity to denote that the hole extends through multiple open space features as it goes through the whole workpiece.[7] |
| TIR | total indicator reading; full indicated run-out | For measurements of eccentricity and other deviations from nominal geometry |
| TOS | summit of steel | |
| TOL | tolerance, tolerancing | |
| TSC | theoretical sharp corner(due south) | Come across discussion at SC and POI. |
| TY | type | For an caption of "type" abbreviated as "TY", see the instance given at "CL" meaning "class". |
| TYP [2] | Typical | Other features share the same characteristic. For example, if the drawing shows viii holes on a commodities circle, and simply ane is dimensioned, with "TYP" or "(TYP)" post-obit the dimension characterization, it means that that hole is typical of all eight holes; in other words, information technology means that the other 7 holes are that size also. The latest revisions of Y14.5 deprecate "TYP" by itself in favor of the specifying of a number of times, such as "2X" or "8X". This helps avoid any ambiguity or uncertainty. TYP or Typical was described in Mil-Std-8, the directing torso prior to adoption of the dimension tolerance interpretation Y14.v serial. Its last revision was C in 1963, but can still be found in many older aircraft drawings. |
U [edit] |
| UAI | utilize as-is | One of the possible MRB dispositions. Others include fleck and rework. |
| ULL | under low limit | This abridgement is used in a machine shop when recording nonconformances. For example, "part scrapped because OD is ULL." See as well OHL. |
| UNC | Unified National Coarse | A subset serial of the Unified Thread Standard. |
| UNEF | Unified National Extra Fine | A subset series of the Unified Thread Standard. |
| UNF | Unified National Fine | A subset serial of the Unified Thread Standard. |
| UNJC | Unified National "J" series Coarse | A subset series of the Unified Thread Standard, with controlled root radius and increased minor diameter. For applications requiring maximum fatigue resistance amid chronic vibration (such every bit in aircraft). |
| UNJF | Unified National "J" serial Fine | A subset series of the Unified Thread Standard, with controlled root radius and increased pocket-sized diameter. For applications requiring maximum fatigue resistance amidst chronic vibration (such every bit in aircraft). |
| UNO | unless noted otherwise | A fairly well-known abbreviation, but to avert confusion, spell out. |
| UNS | Unified National Special; unified numbering arrangement | Unified National Special is a subset serial of the Unified Thread Standard. Information technology is an extensible series, covering various special threads. The unified numbering system is a vaguely named standard for naming alloys by principal element percentages. |
| UON | unless otherwise noted | A little-used (thus not well recognized) abbreviation. To avert confusion, spell out. |
| UOS | unless otherwise specified | A fairly well-known abbreviation, but to avoid confusion, spell out. |
| USASI | United states of america of America Standards Establish | Former name for ANSI (1966–1969). |
| USS | Usa Standard; United states Steel | U.Due south. Standard threads became the National serial (e.g., NC, NF, NEF), which became the Unified National series (e.g., UNC, UNF, UNEF); encounter Unified Thread Standard. Every bit for U.S. Steel, it was once the largest steel company on earth, often an approved supplier, and not infrequently a sole source; hence its mention on drawings. |
| UTS | ultimate tensile strength; Unified Thread Standard | |
V [edit] |
| v | finish | A letter v (Latin small letter v) written on a line representing a surface is a way to indicate that the surface is to be machined rather than left in the as-cast or equally-forged land. The older symbol for this was a small script (italic) f (encounter herein f). Later the ASA convened upon a letter Five (specifically a sans-serif V) touching the surface. Before long this evolved into the "cheque mark" sign with accompanying number that tells the reader a max roughness value (RMS, microinches or micrometres) for the machined terminate, to be measured with a profilometer. |
Due west [edit] |
| WC | tungsten carbide | The "W" comes from the element symbol for tungsten, Due west, which comes from the German Wolfram. |
| WI | wrought atomic number 26 | Both the material and the abridgement are obsolete, or well-nigh so. Spell out the words if this fabric is to be mentioned at all in modern drawings. |
| W/I, w/i | within | A niggling-used abridgement. Amend to spell out for clarity. |
| W/O, w/o | without | Better to spell out for clarity. |
| Ten | | |
| _X_ | used to point the word "past" | When the alphabetic character Ten is preceded past a space, this means "by". For case, a chamfer may be called out as 12 X 45° |
| 10 [2] or ( ) | number of places—for example, 8X or (viii) | When a dimension is used in multiple places either of these prefixes tin can be added to the dimension to define how many times this dimension is used. This instance signifies eight places. At that place should be no whitespace between the numeral and the letter of the alphabet X. (Note on character encoding: Although in typography (including Unicode) the letter Ten and the multiplication sign (×) are singled-out characters with differing glyphs, it is a longstanding tradition in engineering drawing that the letter Ten is interchangeable with the multi sign, unless otherwise specified by the CAx systems used.) |
Y [edit] |
| Y14.X | — | Calls out the drawing standard that this drawing is following. For example, ASME Y14.five and Y14.100 are commonly used standards that define all of the symbols and drafting conventions used. |
| YS | yield strength | |
Z [edit] |
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