| Abbreviation or symbol | Definition | Description |
0-9 [edit] |
A [edit] |
| AC | across corners | Commonly used when measuring the corners of a hex bulldoze, such as a hex nut. |
| AF | across flats | Usually used when measuring the flat surfaces of a hex drive, such as a hex nut. |
| AFF | higher up finished floor | A dimension that establishes a altitude away from the finished floor. Example would be the elevation of a coffee table to the shag of the carpet, non where the bottom of the tables anxiety dig in. |
| AISI | American Atomic number 26 and Steel Found | The AISI acronym is commonly seen as a prefix to steel grades, for example, "AISI 4140". The SAE steel class system was formerly a joint AISI-SAE system. |
| Al or AL | aluminium | |
| ALY | alloy | |
| AMER | American | Referring to the United States |
| AMS | Aerospace Cloth 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 (catalog hardware) ID numbers. Came from the era of circa 1890s-1945, when the U.South. Army and Navy were leading the way on production standardization for logistics improvement, yielding the United States Military Standards system. Today manufacture and ISO also practise a lot of this standardization specification, freeing the U.S. DOD and military to exercise less of it (as explained at United States Military Standard > Origins and evolution), although many MIL standards are still current. (See as well MS- and NAS.) |
| ANN | anneal, annealed | |
| ANSI | American National Standards Found | And the many standards that information technology problems, for case, ANSI Z87.one. |
| APPROX [2] | approximately | |
| AQL | adequate quality level | The threshold of defectiveness that is allowable in a grouping of parts. It is trivial to say that no one wants whatsoever error, and that everyone wants compatible perfection; but in the real world, it almost never happens. The intelligence behind defining AQLs is in figuring out how much fault is tolerable given the costs that would be incurred by any efforts to further reduce its incidence. |
| AR | equally required | An abbreviation used in parts lists (PLs, LMs, BoMs) in the quantity-per-assembly field when a discrete count is not applicable. For case, in an associates with a bolted joint using four bolts, the PL quantity column will say "4" for the bolt PN, "4" for the nut PN, and "AR" for the liquid threadlocker that will exist applied. |
| AS | Aerospace Standards; Australian Standards | 1. Aerospace Standards, technical standards maintained by SAE International and widely used in the aerospace manufacturing industries. Standard aerospace hardware sometimes has the As- prefix in the catalog numbers. 2. Australian Standards, standards per Australian industry. |
| AS, APS, APV, AV, APSL, AVL | canonical production supplier, approved vendor, canonical-product-supplier list, approved-vendor list | When only certain companies are approved by the CDA to manufacture the product (that is, to make what the drawing depicts/defines), they are called past names such as "canonical supplier", "approved product supplier", "approved vendor", or "approved product vendor". The listing of such companies (which usually changes over time) is chosen an APSL, AVL, or similar names. Vetting the companies on this list requires the CDA to audit (and possibly periodically re-inspect) the companies, which incurs an overhead expense for the CDA. Therefore, smaller companies will oft cite larger companies' lists in club to avoid the cost of duplicating the effort. |
| ASA | American Standards Association | Former proper name for ANSI (1920s-1960s). |
| ASME | American Society of Mechanical Engineers | And the many standards that it bug, for example, ASME Y14.v. |
| ASSY or ASY | assembly | referring to an assembly of parts rather than just one (sub)office ("piece part", "detail part"). |
| ASTM | Formerly the American Society for Testing and Materials; now ASTM International | Maintains technical standards, especially regarding materials scientific discipline and engineering and metrology. |
| AVG | average | |
| AWG | American Wire Gauge | |
B [edit] |
| BASIC | basic dimension | A basic dimension is one that is the theoretical value without any tolerance range. It does not serve equally an acceptance criterion. Information technology is thus similar in some respects to a reference dimension. The reason why a basic dimension does not behave a tolerance is that its actual value will fall (acceptably) wherever information technology is put by other features' actual values, where the latter features are the ones with tolerances divers. A mutual and unproblematic example is pigsty location: If a hole's centerpoint location has a position tolerance, so the centerpoint's coordinates do not need (and should non have) separate tolerances applied to them. Thus they are instead given every bit bones dimensions. In modern practice bones dimensions have a rectangular box around them, or sometimes the give-and-take "Basic". |
| BC or B.C. | bolt circle | |
| BCD or B.C.D. | bolt circle bore | |
| BHC | bolt hole circumvolve | Same definition as the bolt circle diameter |
| BHCS | button head cap screw | Like an SHCS but with a button head. |
| BHN | Brinell hardness number | |
| BoM or BOM | beak of materials | Too chosen a list of materials (LM or L/M). Overlaps a lot in concept with a parts list (PL or P/L). There is no consistently enforced stardom between an 50/1000, 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 | design | "per B/P" = "per drawing" |
| BRZ | bronze | |
| BSC | basic dimension | See basic dimension info above. |
C [edit] |
| CAD | computer-aided design, computer-aided drafting; cadmium [plating] | |
| CAGE | Commercial and Authorities Entity [code] | A Muzzle code is a unique identifier to label an entity (that is, a specific regime bureau or corporation at a specific site) that is a CDA, ODA, or MFR of the role defined by the drawing. Ane corporation can take many Muzzle codes, as tin i government, considering each sectionalization, section, and site (campus) tin can take its own Muzzle lawmaking. The same CAGE lawmaking can alter owners over the years. For example, a CAGE code that formerly referred to a certain Martin Marietta site will at present refer to Lockheed Martin at that aforementioned site (although the buildings may have been replaced and the signage may say different names). |
| C-C or C-TO-C | centre-to-centre; on centres | Defines centre-to-heart distance of two features, such equally two holes. |
| CBN | cubic boron nitride | A fabric from which some cutter inserts are made. |
| CDA | current design activity | The CDA is the entity (whether it be a corporation, a unit of measurement of a national military or ministry of defence, or another civilian regime agency) that currently has design potency over the part pattern (definition). It may exist the entity who showtime designed the part (that is, the ODA), just today it is also likely to be a designated successor entity, owing to mergers and acquisitions (One thousand&A) activity (e.g., ODA visitor was bought past CDA company); contract letting (e.thou., an Army engineering section ODA turns over the design activity to the prime number contractor that makes about or all of the parts, turning that contractor into the new CDA); privatization (e.thou., a government privatizes the design and manufacture of materiel, and a country arsenal [state armory] ODA transfers design authority to a individual armory [defense force contractor] ODA); or patent licensing (due east.thousand., a patent-belongings inventor [ODA] licenses one or several companies to manufacture products using his intellectual holding, in which case the "same" function could end upwardly with multiple design authorities, although they may not exist considered the official/nominal CDA). |
| CERT or cert | certification | For example, certification of metallurgical content and processes |
| CG | centerless ground, centerless grinding | |
 | Center marker | Defines the heart of a circle or partial circle. |
| CH or CHAM | chamfer | |
| CI | cast iron | No longer a commonly used abbreviation. Better to spell out for clarity. |
| CL or ℄ | centreline or centerline; class | one. Middle line, the key centrality of a feature. two. Grade, for instance, "paint per spec XYZ revision C type 1 grade 2" may exist abbreviated every bit "paint per spec XYZ REV C TY 1 CL 2" or even in some cases "paint per spec XYZ-C-1-2". (The latter practise is non uncommon just is cryptic for workers with minimal training and experience. The first two options are meliorate practice.) |
| CNC | reckoner 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 strictly than "just falling within the dimensional tolerance zone". Information technology is poor engineering to specify a CR instead of an R simply on the theory of enforcing skillful workmanship. CR is for critical features whose performance truly requires near-perfect geometry. Similar most such characteristics, its presence increases the price of the part, because information technology raises the costs of manufacturing and quality balls. |
| 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 eye-to-center distance 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, downwards | Defines the depth of a feature. |
| ⌀ [2] | diameter | Diameter of a circle. In a feature 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 "bore" include ⌀, DIA, and D. For delta usage, see for example "delta notes". |
| DIA [2] | bore | Diameter of a circle. Abbreviations for "diameter" include ⌀, DIA, and D. |
| DIP | ductile iron pipage | |
| DIM | dimension, dimensioning | |
| DO , do | ditto | Seen occasionally in older drawings instead of repeating a given dimension. |
| DOD , DoD | [U.Southward.] Department of Defense | See also Mod. |
| DPD | digital product definition | A synonym of MBD. |
| DWG , dwg | drawing | 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 | engineering science social club | An order from the engineering department (to be followed past the production department or vendor) overriding/superseding a detail on the drawing, which gets superseded with revised data. Too called past various other names, such every bit engineering change order (ECO), technology change notice (ECN), cartoon change detect (DCN), and and so on. Encounter also REV. |
| EQL , EQ | equal, equally | For example, "⌀ten 4X EQL SPACED ON BC" ways "drill four holes of 10mm diameter equally spaced around the bolt circle." |
| ERC | electric rule cheque | |
| EXIST. | existing | |
F [edit] |
| f | cease | An italic f (Latin small-scale alphabetic character f) written on a line representing a surface was an old mode of indicating that the surface was to be machined rather than left in the every bit-cast or every bit-forged land. The "f" came from "stop" in the sense of "machine finish" as opposed to raw stock/casting/forging. Later on the ASA convened upon a letter V (specifically a sans-serif V) touching the surface. Shortly this evolved into the "bank check 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. |
| FAO | finish all over | A annotation telling the manufacturer that all surfaces of the office are to be machined (equally opposed to leaving whatsoever surfaces as-bandage or equally-forged). Not an obsolete usage, only not seen as commonly as it was decades ago; not least considering parts that once would have been spot-faced castings are now likelier to be contoured from billet with CNC milling. Simply more importantly, best technology practice 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 whatsoever plating or painting needs), or to get out cease out of the part definition (and thus at the manufacturer's discretion) considering it is not of import to fit, function, or criticality. This aforementioned spirit is behind the shift in war machine standards from writing requirements most methods to writing them instead about performance, with the method to attain that goal being up to the ingenuity of the designer. |
| FCF | characteristic control frame | The rectangular box (with several cells) that conveys geometric tolerances in GD&T. It typically tells you what sort of geometric condition (e.m., parallel, perpendicular, round, concentric), followed past what size (and maybe shape) the tolerance zone is, and finally which datums it relates to, the social club of gaging against them, and what material status applies to them (LMC, MMC, or RFS). A diameter 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 drawing, equally opposed to other areas of it, such every bit the parts list (P/L), full general notes (G/N), flagnotes (F/North or FL), championship block (T/B), rev block (R/B), bill of materials (B/M or BoM or BOM), or listing of materials (Fifty/G). Rationales for cartoon changes that are noted in the rev block frequently utilise these abbreviations for brevity (due east.g., "DIM 14.00 was 12.l; added default TOL info to T/B; added leader lines to F/D; added alternate hardware IDs to P/Fifty; added alternate alloy to L/Thousand"). |
| FIM | total indicator movement | Come across also TIR. |
| FL | flag note, flagnote | A note that is chosen out in specific spots in the field of the drawing. It is numbered with a stylized flag symbol surrounding the number. A general note applies generally and is not called out with flags. |
| FL | Floor Level | Floor Level of an existing or proposed building or concrete pad |
| FN or F/N | flag note, flagnote; find number | 1. 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 notation applies generally and is non called out with flags. two. Detect number: "FN" pregnant "find number" refers to the ordinal number that gives an ID tag to one of the constituents in a parts listing (list of materials, bill of materials). Thus "spike using FN7" refers to a fastener that is "find number" 7 in the listing. |
| FoS | feature of size | A type of physical characteristic on a part. An FoS is a feature that can have size associated with it, usually involving the opposition of two surfaces (e.g., the two diametrically opposite sides of a pigsty wall; the two reverse 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 form; the purpose of tolerancing is to define whether the divergence is acceptable 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. |
| FS | far side | The cartoon notations "nearly side" and "far side" tell the reader which side of the office 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 iii holes on both sides of a part (half-dozen full), without having to redefine equivalent hole center coordinates on ii separate views, one for each group. This is not only a convenience for the designer but too a method of error prevention, considering it provides a way to avert forking geometric definition that ideally should be kept unforked to forbid discrepancies. For example, the groups defined above cannot accidentally become asymmetrically discrepant in a time to come revision past the revisor failing to revise both groups equally (because their definition is unified in just i place). Some other instance is part marking locations. An area for part identification marking tin can be circled on a top view but assigned to either the peak or lesser of the function simply with a "about side" or "far side" notation—which obviates adding whatever otherwise-unneeded lesser view to the field of the drawing. |
| FSCM | Federal Stock/Supply Code for Manufacturers | An older name for "CAGE code". Likewise NSCM (National Stock/Supply Code for Manufacturers). |
| FTG | fitting | |
K [edit] |
| GCI | gray bandage iron | |
| GD&T or GDT | geometric dimensioning and tolerancing | A standardized language for defining and communicating dimensions and tolerances. |
| GN or G/N | general note(due south) | Most engineering science drawings have a notes list, which includes both general notes and flag notes. |
H [edit] |
| HBW | hardness, Brinell, tungsten tip | Come across Brinell scale. (The "Due west" comes from the chemical element symbol for tungsten, West, which comes from the High german Wolfram.) |
| HDPE | high-density polyethylene | |
| HHCS | hex head cap spiral | |
| HRA | hardness, Rockwell, A scale | Encounter Rockwell scale. |
| HRB | hardness, Rockwell, B scale | Run across Rockwell scale. |
| HRC | hardness, Rockwell, C calibration | See Rockwell scale. |
| HRS | hot rolled steel | |
| HT TR | estrus care for, heat treatment | |
| H&T or H/T or HT | hardened and tempered | A form of oestrus treatment in which the metal is first hardened and then tempered. Compare N&T. |
I [edit] |
| IAW | in accordance with | A common need in engineering drawings is to instruct the user to exercise activity 10 in accordance with technical standard Y. For example, "Weld all subassemblies IAW AWS XYZ.123" means "Weld all subassemblies in accordance with American Welding Social club standard number XYZ.123" (the number is hypothetical in this example). The word "per" is functionally equivalent to "IAW" in such contexts; thus "rivet all sail metal per MIL-PRF-123456" or "[...] IAW MIL-PRF-123456". Part of the motivation behind the selection of words "in accordance with" is that they do not criminate that any particular activity is explicitly specified by standard XYZ.123 (which "per" could be interpreted as alleging, at least in connotation); rather, these words but instruct the user that whatsoever s/he does must not contradict the standard in any manner. But this is a subtle connotative distinction, and "per" and "IAW" are denotatively equivalent. |
| ID | inner diameter; identity, identification number | |
| IED | Bereft Edge Distance | Drilled holes normally have a required minimum edge distance, if the inspection finds that the border distance is beneath minimum, and so commonly reported as having an IED condition. |
| ISO | International Organisation for Standardization | And the many standards that it specifies, for case, ISO 10303 |
J [edit] |
| JIS | Nihon Industrial Standard | Reference to standards published by the Japanese Standards Association |
Chiliad [edit] |
| Primal | key | Drawing callouts marked "Central" define "key characteristics" that are considered especially important for fit, function, prophylactic, or other reasons. They are thus subjected to college inspection sampling levels. |
| KPSI , kpsi | kilopounds per foursquare inch, that is, thousands of pounds per foursquare inch | See discussion at synonym KSI. |
| KSI , ksi | kilopounds per foursquare inch, that is, thousands of pounds per square inch | KSI (or ksi), likewise 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 textile tin endure per unit of measurement of cross-sectional surface area before 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 (N/m2). |
L [edit] |
| LDD | limited dimension drawing | An implementation of model-based definition that still uses a 2D drawing, simply simply 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 every bit the helix handedness of screw threads or the mirror-paradigm handedness of a symmetrical pair of parts. |
| LM or L/M | list of materials | Besides called a bill of materials (BoM, BOM). Overlaps a lot in concept with a parts list (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 material 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 cloth left on the function. Thus an internal feature of size (eastward.g., a hole) at its biggest diameter, or an external feature of size (eastward.chiliad., a flange) at its smallest thickness. The GD&T symbol for LMC is a circled L. (See likewise MMC and RFS.) A given geometric tolerance may be defined in relation to a sure FoS datum being at LMC or at MMC. |
M [edit] |
| MACH | car; machined | |
| MAJ | major | Every bit in major diameter, or major characteristic (for sampling level) |
| MAX [two] | maximum | |
| MBD | model-based definition | Definition of the part via a 3D CAD model rather than via a 2nd applied science drawing. Drawings may exist printed (plotted) from the model for reference use, only the model remains the governing legal instrument. |
| MBP | measurement between pins | threads, splines, gears (internal, female) (synonymous with MBW) (see also MOP, MOW) |
| MBW | measurement between wires | threads, splines, gears (internal, female person) (see as well MBP, MOP, MOW) |
| MF or Yard/F | brand from | When i function number is made from another, information technology means to take part A and machine some additional features into it, creating part B. The parts list or Fifty/Grand, in the "textile" field, will say "Thou/F PN 12345". |
| MFD | manufactured | |
| MFG | manufacturing | |
| MFR | manufacturer | May be the same entity every bit the CDA or ODA, or may not be. |
| MIL- | [U.S.] Military | A prefix for the names of various United States Military Standards and Specifications, for case, MIL-STD-*, MIL-SPEC-*, MIL-DTL-*, MIL-PRF-*, MIL-A-*, MIL-C-*, MIL-South-*, MIL-STD-1913, MIL-STD-1397. |
| MIN [2] | minimum; minutes; small | |
| MMC | maximum material status | A cloth condition in GD&T. Means that a feature of size (FoS) is at the limit of its size tolerance in the management that leaves the near material left on the role. Thus an internal feature of size (e.yard., a hole) at its smallest bore, or an external characteristic of size (e.g., a flange) at its biggest thickness. The GD&T symbol for MMC is a circled M. (See also LMC and RFS.) A given geometric tolerance may exist defined in relation to a certain FoS datum being at LMC or at MMC. |
| MOD , MoD | Ministry of Defence [U.K. 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) (run across also MBW, MBP, MOP) |
| MPa , MPA | megapascals | The common SI measurement scale for ultimate tensile strength (UTS), that is, the number of units of tensile force that a material tin endure per unit of cross-exclusive expanse before breaking. There is simply i correct casing for the symbol, cap-K-cap-P-small-a, which, like any SI unit symbol, properly should be preserved even when surrounding text is styled in all caps (which latter is a oft employed tradition in engineering drawing). But it is not uncommon to see "MPA" through abandon. Users are not confused regardless. In non-SI terms, the unit for UTS is the KSI (or ksi), which see herein. |
| MRB | fabric review board | A commission that reviews some nonconforming materials which are submitted as potentially still usable/saleable (if the nonconformance does not hinder fit or function). |
| MS- | [U.Due south.] Military Standard | Standards established by the U.S. military and widely used in the aerospace manufacturing (military and ceremonious) and other defense industries. Standard hardware sometimes uses the MS- prefix in the itemize numbers. (See as well 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 United states of america, but today NAS and other standards are used globally. Standard hardware for aerospace piece of work sometimes uses the NAS- prefix in the catalog numbers. (Run into likewise AN- and MS-.) |
| NC | National Coarse; numerical control | The [U.S.] National Coarse series of pre-1949 corresponds today to the Unified National Fibroid (UNC) of the Unified Thread Standard. |
| NCM | nonconforming textile(s) | This abridgement is used in a automobile shop when recording nonconformances (out of tolerance, etc.). For example, "An NCM tag was tied to the scrap part." |
| NCR | nonconformance study | A report listing nonconformances (out of tolerance, etc.). Helps to analyze system weaknesses (such every bit worn-out equipment, operators in need of more than training, or risky practices). |
| NEC | not elsewhere classified; National Electrical Code | In the sense of "not elsewhere classified", the abbreviation is well known inside certain fields, but non others; to avert defoliation, spell out. The National Electrical Code is a standard for electric 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/L | notes list | A list of notes that appears somewhere on the drawing, oftentimes in the upper left corner. |
| NOM [2] | nominal | |
| NORM or NORMD | normalized | referring to normalization, a stress-relieving estrus treatment. Come across also HT TR. |
| NPS | Naval Primary Standard[3] | (Not to be confused with annotating strait pipe equally "NPS", which should instead be annotated NPSM, NPSL, or NPSH[4]) |
| NPT | National Pipe Taper | A subset serial of the Unified Thread Standard. |
| NS | National Special; well-nigh side | 1. National Special, a screw thread series; see Unified Thread Standard. An extensible series, covering various special threads. two. Nearly 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 non communicated using the rules of projection lone. Contexts of usage are rather limited. See "far side" for examples. |
| NSCM | National Stock/Supply Code for Manufacturers | An older name for "Muzzle code". As well FSCM (Federal Stock/Supply Code for Manufacturers). |
| N&T or N/T or NT | normalized and tempered | A course of rut treatment in which the metal is first normalized (stress-relieved) and so tempered. Compare H&T. |
| NTS | not to calibration | See likewise Applied science drawing > Scale. |
O [edit] |
| OAL | overall length | |
| OC | on eye(southward) | That is, middle-to-center; defines centre-to-centre altitude of two features, such as two 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 role design (definition). |
| OHL | over loftier limit | This abbreviation is used in a automobile store when recording nonconformances. For case, "part scrapped considering ID is OHL." Come across also ULL. |
| OPP | opposite | See Function number > Symmetrical parts for explanation. |
| ORIG | original | |
P [edit] |
| pc, pcs | slice, pieces | |
| PD | pitch diameter | |
| PDM , PDMS | product data direction, product data director [app], product data management system [app] | A database(s) and related application(s) 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, east-mails, faxes, photos, give-and-take processor documents, spreadsheets. Meet also PLM. |
| PH or P/H | precipitation hardening, precipitation-hardened; pilot hole | |
| PHR BRZ | phosphor bronze | |
| PL or P/L | parts list | A list, usually tabular and oft on the drawing (if non accompanying the cartoon on a carve up sheet), list the parts needed in an associates, including subparts, standard parts, and hardware. In that location is no consistently enforced distinction between an Fifty/K, a BoM, or a P/L. |
| PLM | production lifecycle management; plant lifecycle management | See also PDM. |
| PMI | Product and manufacturing data | Product and manufacturing information conveys non-geometric attributes in 3D computer-aided pattern (CAD) and Collaborative Product Evolution systems necessary for manufacturing product components and assemblies. |
| PN or P/N | office number | |
| POI | bespeak of intersection | A signal that makes easier the layout, toolpath programming, or inspection of the function. Information technology is the intersection point of lines that may non run across on the finished part, such every bit the tangent lines of a bend or the theoretical sharp corner (TSC) that edge-breaking and deburring will remove. Meet also SC, TSC, and AC. |
| P.F. | press fit | A fastening or mating between two parts which is achieved by friction afterward the parts are pushed together. |
| PSI | pounds per square inch | A unit of measurement for pressure. See besides KSI. |
| PTFE | polytetrafluoroethylene | Also well known by the make name Teflon. |
| PVC | polyvinyl chloride | |
Q [edit] |
| QMS | quality management arrangement | A organization in identify to ensure that quality of industry is produced and maintained; a system to prevent lacking parts from being made, or, fifty-fifty 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 scale | Run across surface roughness; run across Rockwell scale. |
| RB , Rb | Rockwell B scale | See Rockwell calibration. |
| RC , Rc | Rockwell C calibration | See Rockwell scale. |
| REF or ( )[two] | reference dimension | See Reference dimension. On a technical drawing a dimension or annotation that is given just for reference and therefore is not intended to be used as a part acceptance criterion (although it may be used as an assistance to production or inspection). Parenethesis( value ) denote the aforementioned thing and were standartized by ASME. When a dimension is defined in 1 view just as well mentioned again in some other view, it volition be given every bit reference in the second case. This rule prevents the mistake of defining information technology in two unlike ways accidentally; the "principal" (non-reference) mention is the only one that counts equally a feature definition and thus every bit a office acceptance criterion. Run across also basic dimensions, which are similar in some respects. |
| REQD or REQ'D | required | For example, "4 REQD" written next to a fastener ways that iv of those fasteners are required for the associates. |
| REV | revision | Engineering drawings and fabric or process specifications are often revised; the usual revision command convention is to label the versions A, B, C, D, etc.; a revision block (rev cake) is a tabular area on the cartoon (typically in the upper correct corner) that lists the revision letters, a cursory clarification of the changes and reasons, and approving initials and dates. Revisions beyond "Z" offset the alphabet over once more with doubling, e.g., AA, AB, Air conditioning, Advert, and so on. In the days of manual drafting, redrawing was expensive, so engineering orders (EOs, ECOs, DCNs, ECNs) were not always incorporated into a adjacent-letter revision. They thus accompany the drawing as part of the TDP. With the broadcasting of software usage (CAD, CAM, PDMSs), revision control is frequently better handled present, in competent hands at least. In recent years the revision control of engineering drawings has fifty-fifty been standardized by ASME, in their standard Y14.35M.[five] |
| RFS | regardless of feature size | A material condition (or more than precisely, freedom from such) in GD&T. Means that a given geometric tolerance is true in relation to a certain datum regardless of its bodily size (LMC ≤ actual size ≤ MMC). |
| RH | correct-hand | Referring to handedness, such as the helix handedness of screw threads or the mirror-image handedness of a symmetrical pair of parts. |
| RHR | roughness height reading | See surface roughness. |
| RL | Reduced Level or Relative Level | Surface Level |
| RMA | return cloth dominance | See also RTV. |
| RMS | root mean square | RMS in general is a statistical technique to define a representative value for a group of data points. With regard to surface roughness, information technology means that the heights of the individual microscopic peaks and valleys shall be averaged together via RMS to yield a measurement of roughness. Come across also herein f equally a finish marking. |
| RT or R/T | crude turn, rough turned; room temperature | Crude-turned means turned on a lathe but not finished to a final machined dimension and surface roughness. Can apply to bar stock or to parts in-process. Room temperature is sometimes abbreviated "RT" within tables of specs for finishing operations (plating, painting, etc.). |
| RTP | release to product | The issuance of a drawing from the engineering/design activity to the production activity. In other words, the event when a draft becomes a completed, official document. A stamp on the cartoon maxim "ISSUED" documents that RTP has occurred. |
| RTV | room-temperature vulcanizing; render to vendor | 1. RTV sealants, a way to seal joints. 2. Return to vendor, send parts back to a vendor for rework or refund because they are nonconforming. Such RTV often requires an RMA. |
| RZ , Rz | roughness, hateful depth | Run into surface roughness. |
S [edit] |
| SAE | Formerly the Society of Automotive Engineers; at present SAE International | And the many standards that it bug, for case, the SAE AMS and SAE AS standards series. |
| SC or S/C | sharp corners | Dimensions may be given as "across sharp corners" although the corners get radiused. In other words, distances may be given from intersection points where lines intersect, regardless of edge breaks or fillets. This is usually unsaid by default, then "S/C" oftentimes need non be explicitly added. But in some cases information technology clarifies the definition. See also TSC, POI, and Air conditioning. |
| SF or S/F | spotface slip fit | |
| SFACE or S/FACE | spotface | |
| SHCS | socket caput cap screw | A cap screw with a socket head (usually implying a hex socket, driven with a hex key. |
| SHN | shown | See Part number > Symmetrical parts for explanation. |
| SHSS | socket head gear up spiral | A ready screw with a socket head (normally implying a hex socket, driven with a hex key. |
| SI | Système international [d'unités] [International System of Units] | The metric system in its current form (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; supersede | i. Stainless steel, see besides CRES. two. Replace/supersedes/superseded, refers to when 1 certificate (specification, standard, drawing, etc.) replaces (supersedes) some other (see also revision command). |
| SST | stainless steel | As per Y14.38–2007 |
| STD | standard | |
| Step | Standard for the Exchange of Product Model Data | A standard format defined past ISO 10303 for MBD data generation, storage, and exchange. |
| STA | solution treated and aged | |
| STI | screw thread insert | |
| STL | steel | |
| STK | stock | A nominal dimension for the stock textile, such equally bar stock |
| SW | Schlüsselweite | Translates as Key or Wrench Width. Width beyond flats, frequently found on drawings of German origin. |
T [edit] |
| TAP | tapped pigsty | Ordinarily implies drilling a hole if the pigsty does not already exist. |
| TB or T/B | championship cake | An surface area of the cartoon, almost always at the bottom right, that contains the title of the drawing and other fundamental information. Typical fields in the championship cake include the cartoon championship (usually the part name); drawing number (usually the part number); names and/or ID numbers relating to who designed and/or manufactures the part (which involves some complication considering pattern and manufacturing entities for a given part number often 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 name (meet 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 non given in a carve up listing/bill of materials); and admission command information (information almost who is authorized to possess, view, or share copies of the information encoded by the drawing, e.g., classification notices, copyright notices, patent numbers). Drawing revision (versioning) information is not always included in the title block considering information technology frequently appears in a split up revisions cake. |
| TCC | time-current curve | |
| TDP | technical data package | The complete bundle of information that defines a part, of which the drawing itself is frequently only a subset. It also includes engineering orders (drawing change notices), 3D model datasets, data tables, memoranda, and whatsoever special conditions called out by the purchase order or the companies' terms-and-conditions documents. |
| THD or thd | thread | |
| THRD | threaded | |
| THK or thk | thickness | |
| THRU | through | Optionally practical to a hole dimension to signify that the hole extends through the workpiece. For case, THRU may be stated in a hole dimension if the hole'southward end status is not articulate from graphical representation of the workpiece.[6] |
| THRU ALL | Through all | Similar to THRU. Sometimes used on hole dimensions for clarity to announce that the pigsty extends through multiple open up space features as it goes through the whole workpiece.[7] |
| TIR | total indicator reading; total indicated run-out | For measurements of eccentricity and other deviations from nominal geometry |
| TOS | peak of steel | |
| TOL | tolerance, tolerancing | |
| TSC | theoretical abrupt corner(s) | See discussion at SC and POI. |
| TY | blazon | For an caption of "type" abbreviated every bit "TY", see the example given at "CL" meaning "class". |
| TYP [2] | Typical | Other features share the same characteristic. For case, if the drawing shows 8 holes on a commodities circle, and just one is dimensioned, with "TYP" or "(TYP)" post-obit the dimension label, it ways that that pigsty is typical of all 8 holes; in other words, it ways 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-viii, the directing body prior to adoption of the dimension tolerance interpretation Y14.5 series. Its last revision was C in 1963, only tin can nevertheless be institute in many older aircraft drawings. |
U [edit] |
| UAI | employ equally-is | One of the possible MRB dispositions. Others include scrap and rework. |
| ULL | under low limit | This abbreviation is used in a motorcar store when recording nonconformances. For example, "part scrapped because OD is ULL." See also OHL. |
| UNC | Unified National Coarse | A subset serial of the Unified Thread Standard. |
| UNEF | Unified National Actress Fine | A subset series of the Unified Thread Standard. |
| UNF | Unified National Fine | A subset series of the Unified Thread Standard. |
| UNJC | Unified National "J" serial Fibroid | A subset series of the Unified Thread Standard, with controlled root radius and increased minor diameter. For applications requiring maximum fatigue resistance among chronic vibration (such equally in aircraft). |
| UNJF | Unified National "J" series Fine | A subset series of the Unified Thread Standard, with controlled root radius and increased small-scale bore. For applications requiring maximum fatigue resistance amid chronic vibration (such as in shipping). |
| UNO | unless noted otherwise | A fairly well-known abbreviation, but to avoid confusion, spell out. |
| UNS | Unified National Special; unified numbering organization | Unified National Special is a subset series of the Unified Thread Standard. Information technology is an extensible series, covering various special threads. The unified numbering organization 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 avoid confusion, spell out. |
| UOS | unless otherwise specified | A adequately well-known abbreviation, but to avoid confusion, spell out. |
| USASI | Us of America Standards Institute | Former name for ANSI (1966–1969). |
| USS | United States Standard; United states of america Steel | U.Due south. Standard threads became the National series (e.thousand., NC, NF, NEF), which became the Unified National series (east.1000., UNC, UNF, UNEF); run into Unified Thread Standard. As for U.S. Steel, it was one time the largest steel visitor on world, oft an approved supplier, and non infrequently a sole source; hence its mention on drawings. |
| UTS | ultimate tensile force; Unified Thread Standard | |
5 [edit] |
| 5 | terminate | A letter five (Latin minor letter v) written on a line representing a surface is a way to signal that the surface is to be machined rather than left in the as-cast or every bit-forged state. The older symbol for this was a small script (italic) f (encounter herein f). Later the ASA convened upon a letter V (specifically a sans-serif V) touching the surface. Presently this evolved into the "check mark" sign with accompanying number that tells the reader a max roughness value (RMS, microinches or micrometres) for the machined finish, to be measured with a profilometer. |
Westward [edit] |
| WC | tungsten carbide | The "West" comes from the element symbol for tungsten, Westward, which comes from the German Wolfram. |
| WI | wrought iron | Both the material and the abbreviation are obsolete, or nearly so. Spell out the words if this fabric is to be mentioned at all in modernistic drawings. |
| W/I, due west/i | within | A trivial-used abbreviation. Better to spell out for clarity. |
| W/O, w/o | without | Better to spell out for clarity. |
| 10 | | |
| _X_ | used to bespeak the word "by" | When the letter 10 is preceded past a space, this means "by". For example, a chamfer may exist called out equally 12 X 45° |
| X [ii] or ( ) | number of places—for example, 8X or (viii) | When a dimension is used in multiple places either of these prefixes 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 alphabetic character Ten. (Notation on character encoding: Although in typography (including Unicode) the letter of the alphabet X and the multiplication sign (×) are distinct characters with differing glyphs, it is a longstanding tradition in technology drawing that the letter X 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 Y14.5 and Y14.100 are commonly used standards that define all of the symbols and drafting conventions used. |
| YS | yield forcefulness | |
Z [edit] |
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