| Abridgement or symbol | Definition | Description |
0-nine [edit] |
A [edit] |
| Air-conditioning | across corners | Ordinarily used when measuring the corners of a hex drive, such as a hex nut. |
| AF | across flats | Normally used when measuring the apartment surfaces of a hex drive, such as a hex nut. |
| AFF | to a higher place finished flooring | A dimension that establishes a distance away from the finished floor. Case would be the top of a coffee table to the shag of the carpet, non where the bottom of the tables feet dig in. |
| AISI | American Iron and Steel Institute | The AISI acronym is unremarkably seen equally a prefix to steel grades, for example, "AISI 4140". The SAE steel course system was formerly a joint AISI-SAE system. |
| Al or AL | aluminium | |
| ALY | alloy | |
| AMER | American | Referring to the The states |
| AMS | Aerospace Material Standards | Standards in materials science and engineering maintained by SAE International and widely used in the aerospace manufacturing industries. |
| AN- | Ground forces-Navy | A prefix for standard hardware (catalog hardware) ID numbers. Came from the era of circa 1890s-1945, when the U.Due south. Army and Navy were leading the manner on production standardization for logistics improvement, yielding the United States Armed forces Standards system. Today industry and ISO besides do a lot of this standardization specification, freeing the U.Due south. DOD and armed services to practise less of it (as explained at U.s. Military Standard > Origins and evolution), although many MIL standards are still current. (Encounter also MS- and NAS.) |
| ANN | anneal, annealed | |
| ANSI | American National Standards Found | And the many standards that it issues, for example, ANSI Z87.ane. |
| APPROX [ii] | approximately | |
| AQL | acceptable quality level | The threshold of defectiveness that is allowable in a group of parts. It is trivial to say that no one wants any error, and that everyone wants uniform perfection; but in the real world, information technology virtually never happens. The intelligence behind defining AQLs is in figuring out how much error is tolerable given the costs that would be incurred past whatsoever efforts to further reduce its incidence. |
| AR | as 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 articulation using four bolts, the PL quantity column will say "iv" for the commodities PN, "4" for the nut PN, and "AR" for the liquid threadlocker that will exist practical. |
| As | Aerospace Standards; Australian Standards | one. 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. |
| Every bit, APS, APV, AV, APSL, AVL | approved production supplier, canonical vendor, canonical-product-supplier list, canonical-vendor list | When merely certain companies are approved by the CDA to manufacture the product (that is, to make what the cartoon depicts/defines), they are called by names such every bit "approved supplier", "canonical product supplier", "canonical vendor", or "approved product vendor". The listing of such companies (which usually changes over time) is called an APSL, AVL, or like names. Vetting the companies on this list 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 cost of duplicating the endeavor. |
| ASA | American Standards Clan | Sometime proper name for ANSI (1920s-1960s). |
| ASME | American Society of Mechanical Engineers | And the many standards that information technology problems, for example, ASME Y14.v. |
| ASSY or ASY | assembly | referring to an assembly of parts rather than only one (sub)part ("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 applied science and metrology. |
| AVG | boilerplate | |
| AWG | American Wire Guess | |
B [edit] |
| BASIC | basic dimension | A basic dimension is ane that is the theoretical value without whatsoever 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 bones dimension does non carry a tolerance is that its actual value will autumn (passably) wherever it is put by other features' actual values, where the latter features are the ones with tolerances divers. A common and elementary instance is pigsty location: If a pigsty'south centerpoint location has a position tolerance, then the centerpoint'southward coordinates practice not need (and should not take) separate tolerances applied to them. Thus they are instead given as basic dimensions. In modern practise basic dimensions have a rectangular box around them, or sometimes the word "BASIC". |
| BC or B.C. | commodities circle | |
| BCD or B.C.D. | bolt circle diameter | |
| BHC | bolt hole circle | Aforementioned definition as the bolt circle diameter |
| BHCS | button head cap screw | Similar an SHCS but with a push button caput. |
| BHN | Brinell hardness number | |
| BoM or BOM | bill of materials | Too called a listing of materials (LM or Fifty/M). Overlaps a lot in concept with a parts listing (PL or P/L). At that place is no consistently enforced distinction between an Fifty/M, 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 | See basic dimension info in a higher place. |
C [edit] |
| CAD | computer-aided design, computer-aided drafting; cadmium [plating] | |
| CAGE | Commercial and Government Entity [code] | A CAGE code is a unique identifier to label an entity (that is, a specific authorities bureau or corporation at a specific site) that is a CDA, ODA, or MFR of the office divers by the drawing. Ane corporation can have many CAGE codes, every bit tin one government, because each division, department, and site (campus) can take its own Cage code. The same CAGE code can change owners over the years. For example, a Cage code that formerly referred to a sure 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 dissimilar names). |
| C-C or C-TO-C | centre-to-centre; on centres | Defines centre-to-centre 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 defense force, or another noncombatant government agency) that currently has blueprint authority over the part blueprint (definition). It may be the entity who first designed the part (that is, the ODA), but today it is likewise probable to be a designated successor entity, owing to mergers and acquisitions (Yard&A) action (e.grand., ODA company was bought past CDA visitor); contract letting (eastward.g., an Army engineering department ODA turns over the design action to the prime contractor that makes well-nigh or all of the parts, turning that contractor into the new CDA); privatization (eastward.grand., a regime privatizes the design and manufacture of materiel, and a state arsenal [land armory] ODA transfers pattern authority to a private armory [defence force contractor] ODA); or patent licensing (due east.g., a patent-belongings inventor [ODA] licenses one or several companies to manufacture products using his intellectual property, in which example the "aforementioned" function could end upwards with multiple design regime, although they may non exist considered the official/nominal CDA). |
| CERT or cert | certification | For example, certification of metallurgical content and processes |
| CG | centerless ground, centerless grinding | |
 | Eye marker | Defines the center of a circle or fractional circle. |
| CH or CHAM | chamfer | |
| CI | cast fe | No longer a commonly used abbreviation. Better to spell out for clarity. |
| CL or ℄ | centreline or centerline; class | i. Center line, the central axis of a characteristic. 2. Form, for example, "paint per spec XYZ revision C blazon 1 grade ii" may be abbreviated as "pigment per spec XYZ REV C TY 1 CL 2" or even in some cases "paint per spec XYZ-C-1-2". (The latter practice is non uncommon but is ambiguous for workers with minimal training and experience. The first two options are amend practice.) |
| CNC | computer 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 grade of the radius must exist controlled more strictly than "just falling inside the dimensional tolerance zone". Information technology is poor engineering to specify a CR instead of an R simply on the theory of enforcing good workmanship. CR is for disquisitional features whose performance truly requires near-perfect geometry. Like most such characteristics, its presence increases the cost of the part, considering information technology raises the costs of manufacturing and quality assurance. |
| CRES | corrosion-resistant [steel] | Largely synonymous with stainless steel, unless specific grades, specs, and distinctions are made on the drawing. Some people treat CRES equally a subset of the stainless steels. |
| CRS | cold rolled steel; on centres | Defines centre-to-centre altitude of two features, such equally two holes. |
| C/T | Correlation / Tracking | |
C'Diameter 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 | Diameter of a circumvolve. In a feature control frame (FCF), the ⌀ symbol tells you that the tolerance zone for the geometric tolerance is cylindrical. Abbreviations for "bore" include ⌀, DIA, and D. |
| D | diameter; delta | Abbreviations for "diameter" include ⌀, DIA, and D. For delta usage, meet for instance "delta notes". |
| DIA [2] | diameter | Bore of a circle. Abbreviations for "diameter" include ⌀, DIA, and D. |
| DIP | ductile atomic number 26 pipe | |
| DIM | dimension, dimensioning | |
| DO , do | ditto | Seen occasionally in older drawings instead of repeating a given dimension. |
| DOD , DoD | [U.South.] Section of Defense | Run across also Modernistic. |
| DPD | digital product definition | A synonym of MBD. |
| DWG , dwg | drawing | Referring to the engineering science drawing |
Due east [edit] |
| ED | border distance | Drilled holes, and fasteners are commonly required to take a minimum border distance (min ED). |
| EO , ECO, ECN | engineering social club | An club from the engineering department (to be followed by the product section or vendor) overriding/superseding a item on the drawing, which gets superseded with revised information. Also called past various other names, such as engineering change society (ECO), engineering change notice (ECN), drawing change notice (DCN), and then on. Meet besides REV. |
| EQL , EQ | equal, equally | For example, "⌀x 4X EQL SPACED ON BC" means "drill four holes of 10mm diameter every bit spaced effectually the commodities circumvolve." |
| ERC | electrical dominion check | |
| Be. | existing | |
F [edit] |
| f | finish | An italic f (Latin small letter f) written on a line representing a surface was an old manner of indicating that the surface was to be machined rather than left in the as-cast or as-forged country. The "f" came from "finish" in the sense of "machine finish" as opposed to raw stock/casting/forging. Later the ASA convened upon a letter of the alphabet V (specifically a sans-serif Five) touching the surface. Presently 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 finish, to be measured with a profilometer. |
| FAO | terminate all over | A note telling the manufacturer that all surfaces of the function are to exist machined (as opposed to leaving whatsoever surfaces as-bandage or equally-forged). Not an obsolete usage, only not seen as normally as information technology was decades agone; not least because parts that once would have been spot-faced castings are now likelier to exist contoured from billet with CNC milling. But more chiefly, all-time engineering do 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 terminate out of the part definition (and thus at the manufacturer's discretion) considering information technology is not important to fit, function, or criticality. This same spirit is behind the shift in military standards from writing requirements well-nigh methods to writing them instead nearly performance, with the method to reach that goal being upwardly to the ingenuity of the designer. |
| FCF | feature 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.g., parallel, perpendicular, circular, concentric), followed by what size (and perchance shape) the tolerance zone is, and finally which datums it relates to, the guild of gaging confronting them, and what material condition 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, as opposed to other areas of it, such as the parts list (P/L), general notes (G/N), flagnotes (F/Northward or FL), title block (T/B), rev block (R/B), beak 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 utilize these abbreviations for brevity (eastward.m., "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/L; added alternate alloy to L/M"). |
| FIM | full indicator movement | Encounter as well TIR. |
| FL | flag note, flagnote | A notation 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 general notation applies mostly and is not chosen out with flags. |
| FL | Floor Level | Floor Level of an existing or proposed building or physical 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 cartoon. Information technology is numbered with a stylized flag symbol surrounding the number (or sometimes a delta symbol). A general note applies generally and is not called out with flags. 2. Find number: "FN" pregnant "find number" refers to the ordinal number that gives an ID tag to 1 of the constituents in a parts list (list of materials, bill of materials). Thus "fasten using FN7" refers to a fastener that is "find number" 7 in the list. |
| FoS | feature of size | A type of concrete feature on a function. An FoS is a characteristic that can accept size associated with it, usually involving the opposition of two surfaces (eastward.thousand., the two diametrically reverse sides of a pigsty wall; the 2 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 grade; the purpose of tolerancing is to define whether the difference is acceptable or not. Thus textile condition (LMC, MMC, somewhere in between, or RFS) is important in GD&T. ) A given geometric tolerance may be divers in relation to a certain FoS datum existence at LMC or at MMC. |
| FS | far side | The cartoon 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 project alone. Contexts of usage are rather limited. I example is hole locations; "3X AND 3X FAR SIDE" defines symmetrical groups of three holes on both sides of a part (6 total), without having to redefine equivalent hole eye coordinates on two separate views, one for each grouping. This is not merely a convenience for the designer but likewise a method of error prevention, because it provides a way to avoid forking geometric definition that ideally should exist kept unforked to prevent discrepancies. For example, the groups defined higher up cannot accidentally become asymmetrically discrepant in a future revision by the revisor failing to revise both groups every bit (because their definition is unified in only one place). Another example is part marking locations. An area for role identification marker tin be circled on a top view simply assigned to either the meridian or bottom of the part merely with a "near side" or "far side" notation—which obviates adding any otherwise-unneeded bottom view to the field of the drawing. |
| FSCM | Federal Stock/Supply Code for Manufacturers | An older name for "Cage code". Also NSCM (National Stock/Supply Code for Manufacturers). |
| FTG | fitting | |
One thousand [edit] |
| GCI | gray cast atomic number 26 | |
| GD&T or GDT | geometric dimensioning and tolerancing | A standardized language for defining and communicating dimensions and tolerances. |
| GN or Chiliad/Due north | general annotation(south) | Nearly engineering science drawings have a notes list, which includes both full general notes and flag notes. |
H [edit] |
| HBW | hardness, Brinell, tungsten tip | Encounter Brinell scale. (The "W" comes from the element symbol for tungsten, Due west, which comes from the German Wolfram.) |
| HDPE | high-density polyethylene | |
| HHCS | hex head cap screw | |
| HRA | hardness, Rockwell, A scale | Meet Rockwell scale. |
| HRB | hardness, Rockwell, B scale | See Rockwell scale. |
| HRC | hardness, Rockwell, C calibration | See Rockwell calibration. |
| HRS | hot rolled steel | |
| HT TR | oestrus treat, heat handling | |
| H&T or H/T or HT | hardened and tempered | A form of estrus treatment in which the metal is showtime hardened so tempered. Compare N&T. |
I [edit] |
| IAW | in accordance with | A common demand in engineering drawings is to instruct the user to practise activity Ten in accord with technical standard Y. For instance, "Weld all subassemblies IAW AWS XYZ.123" ways "Weld all subassemblies in accordance with American Welding Lodge 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 metallic per MIL-PRF-123456" or "[...] IAW MIL-PRF-123456". Office of the motivation behind the choice of words "in accordance with" is that they practise not allege that whatsoever detail activeness is explicitly specified past standard XYZ.123 (which "per" could be interpreted as alleging, at least in connotation); rather, these words just instruct the user that any southward/he does must non contradict the standard in any way. Just this is a subtle connotative distinction, and "per" and "IAW" are denotatively equivalent. |
| ID | inner diameter; identity, identification number | |
| IED | Insufficient Edge Distance | Drilled holes commonly have a required minimum edge altitude, if the inspection finds that the edge distance is below minimum, and then unremarkably reported equally having an IED condition. |
| ISO | International Arrangement for Standardization | And the many standards that it specifies, for example, ISO 10303 |
J [edit] |
| JIS | Nippon Industrial Standard | Reference to standards published past the Japanese Standards Association |
K [edit] |
| KEY | primal | Cartoon callouts marked "KEY" define "central characteristics" that are considered especially important for fit, function, safety, or other reasons. They are thus subjected to college inspection sampling levels. |
| KPSI , kpsi | kilopounds per square inch, that is, thousands of pounds per foursquare inch | See discussion at synonym KSI. |
| KSI , ksi | kilopounds per square inch, that is, thousands of pounds per square inch | KSI (or ksi), also abbreviated KPSI or kpsi, is a common not-SI measurement scale for ultimate tensile forcefulness, that is, the number of units of tensile force that a fabric can suffer per unit of cross-sectional area before breaking. In the SI arrangement, the unit is the pascal (Pa) (or a multiple thereof, frequently megapascals (MPa), using the mega- prefix); or, equivalently to pascals, newtons per foursquare metre (N/thoutwo). |
50 [edit] |
| LDD | limited dimension drawing | An implementation of model-based definition that yet uses a 2D drawing, but only containing disquisitional information. All data missing from the drawing is to be pulled from a 3D model of the function or assembly. |
| LH | left-manus | Referring to handedness, such equally the helix handedness of screw threads or the mirror-image handedness of a symmetrical pair of parts. |
| LM or L/M | list of materials | Also 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 stardom between an L/M, a BoM, or a P/L. |
| LMC | least material 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 least material left on the function. Thus an internal characteristic of size (due east.g., a hole) at its biggest diameter, or an external characteristic of size (e.k., a flange) at its smallest thickness. The GD&T symbol for LMC is a circled L. (See also MMC and RFS.) A given geometric tolerance may be defined in relation to a sure FoS datum being at LMC or at MMC. |
Thousand [edit] |
| MACH | automobile; machined | |
| MAJ | major | Every bit in major bore, 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 2D engineering drawing. Drawings may be printed (plotted) from the model for reference employ, merely 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) (come across also MBP, MOP, MOW) |
| MF or Yard/F | make from | When one part number is made from another, it means to take part A and motorcar some additional features into information technology, creating part B. The parts list or Fifty/M, in the "material" field, will say "Yard/F PN 12345". |
| MFD | manufactured | |
| MFG | manufacturing | |
| MFR | manufacturer | May exist the same entity as the CDA or ODA, or may not be. |
| MIL- | [U.South.] Military | A prefix for the names of various United States War machine 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 [2] | minimum; minutes; pocket-size | |
| MMC | maximum cloth condition | A material status in GD&T. Ways that a feature of size (FoS) is at the limit of its size tolerance in the direction that leaves the well-nigh material left on the part. Thus an internal feature of size (e.grand., a hole) at its smallest diameter, or an external feature of size (due east.g., a flange) at its biggest thickness. The GD&T symbol for MMC is a circled 1000. (See also LMC and RFS.) A given geometric tolerance may be defined in relation to a certain FoS datum beingness at LMC or at MMC. |
| MOD , MoD | Ministry building of Defence [U.K. and others] | See also DOD. |
| MOP , MoP | measurement over pins | threads, splines, gears (external, male) (synonymous with MOW, measurement over wires) |
| MOW , MoW | measurement over wires | threads, splines, gears (external, male) (meet also MBW, MBP, MOP) |
| MPa , MPA | megapascals | The mutual SI measurement calibration for ultimate tensile forcefulness (UTS), that is, the number of units of tensile forcefulness that a material can endure per unit of cross-sectional expanse earlier breaking. There is simply i correct casing for the symbol, cap-One thousand-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 frequently employed tradition in applied science drawing). Only it is not uncommon to encounter "MPA" through carelessness. Users are not confused regardless. In not-SI terms, the unit for UTS is the KSI (or ksi), which run across herein. |
| MRB | material review board | A committee that reviews some nonconforming materials which are submitted as potentially nevertheless usable/saleable (if the nonconformance does not hinder fit or function). |
| MS- | [U.S.] Military 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. (See likewise AN- and NAS.) |
N [edit] |
| NAS | National Aerospace Standards | Standards maintained past SAE International and widely used in the aerospace manufacturing industries. The "National" formerly implicitly referenced the The states, but today NAS and other standards are used globally. Standard hardware for aerospace work sometimes uses the NAS- prefix in the catalog numbers. (See also AN- and MS-.) |
| NC | National Fibroid; numerical control | The [U.South.] National Coarse series of pre-1949 corresponds today to the Unified National Coarse (UNC) of the Unified Thread Standard. |
| NCM | nonconforming material(s) | This abridgement is used in a machine store when recording nonconformances (out of tolerance, etc.). For example, "An NCM tag was tied to the flake part." |
| NCR | nonconformance report | A report list nonconformances (out of tolerance, etc.). Helps to clarify system weaknesses (such as worn-out equipment, operators in need of more grooming, or risky practices). |
| NEC | not elsewhere classified; National Electric Code | In the sense of "not elsewhere classified", the abridgement is well known within certain fields, only not others; to avoid defoliation, spell out. The National Electrical Code is a standard for electrical piece of work. |
| NEF | National Extra Fine | The [U.S.] National Extra Fine series of pre-1949 corresponds today to the Unified National Extra 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, often in the upper left corner. |
| NOM [two] | nominal | |
| NORM or NORMD | normalized | referring to normalization, a stress-relieving oestrus treatment. See also HT TR. |
| NPS | Naval Master Standard[3] | (Not to be confused with annotating strait pipe as "NPS", which should instead be annotated NPSM, NPSL, or NPSH[4]) |
| NPT | National Pipe Taper | A subset series of the Unified Thread Standard. |
| NS | National Special; near side | 1. National Special, a screw thread serial; see Unified Thread Standard. An extensible series, covering various special threads. 2. Near side: The cartoon notations "virtually side" and "far side" tell the reader which side of the role a feature is on, in occasional contexts where that fact is not communicated using the rules of project alone. Contexts of usage are rather limited. See "far side" for examples. |
| NSCM | National Stock/Supply Code for Manufacturers | An older name for "CAGE lawmaking". Also FSCM (Federal Stock/Supply Code for Manufacturers). |
| N&T or Due north/T or NT | normalized and tempered | A form of heat treatment in which the metal is first normalized (stress-relieved) and so tempered. Compare H&T. |
| NTS | non to scale | Come across as well Engineering drawing > Scale. |
O [edit] |
| OAL | overall length | |
| OC | on heart(s) | That is, centre-to-heart; defines middle-to-centre distance of two features, such every bit two holes. |
| OD | outer diameter | |
| ODA | original design activeness | The entity that originally designed a role. Compare to CDA, the entity that currently has design dominance over the function design (definition). |
| OHL | over high limit | This abbreviation is used in a motorcar store when recording nonconformances. For example, "function scrapped considering ID is OHL." Come across also ULL. |
| OPP | opposite | Run into Role number > Symmetrical parts for explanation. |
| ORIG | original | |
P [edit] |
| pc, pcs | slice, pieces | |
| PD | pitch diameter | |
| PDM , PDMS | production data management, production information manager [app], product data management system [app] | A database(south) and related awarding(s) that facilitate all aspects of managing data files—eastward.g., TDPs, TDP versions, drawings, model datasets, specs, addenda, certs, memoranda, EOs, ECOs, DCNs, RFQs, quotes, POs, eastward-mails, faxes, photos, discussion processor documents, spreadsheets. See also PLM. |
| PH or P/H | atmospheric precipitation hardening, precipitation-hardened; pilot pigsty | |
| PHR BRZ | phosphor bronze | |
| PL or P/L | parts list | A listing, usually tabular and often on the drawing (if not accompanying the cartoon on a separate sheet), listing the parts needed in an assembly, including subparts, standard parts, and hardware. There is no consistently enforced distinction between an L/G, a BoM, or a P/L. |
| PLM | product lifecycle management; found lifecycle management | Encounter also PDM. |
| PMI | Product and manufacturing data | Product and manufacturing information conveys non-geometric attributes in 3D figurer-aided design (CAD) and Collaborative Product Development systems necessary for manufacturing product components and assemblies. |
| PN or P/N | part number | |
| POI | indicate of intersection | A point that makes easier the layout, toolpath programming, or inspection of the part. Information technology is the intersection betoken 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. Encounter also SC, TSC, and AC. |
| P.F. | printing fit | A fastening or mating between two parts which is accomplished past friction subsequently the parts are pushed together. |
| PSI | pounds per square inch | A unit of measurement for pressure. See also KSI. |
| PTFE | polytetrafluoroethylene | As well well known past the brand name Teflon. |
| PVC | polyvinyl chloride | |
Q [edit] |
| QMS | quality management system | A organisation in place to ensure that quality of industry is produced and maintained; a organisation to prevent defective 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 inside the dimensional tolerance zone) are tolerated unless "CR" (controlled radius) is explicitly specified. |
| RA , Ra | roughness, average; Rockwell A calibration | Run into surface roughness; run into Rockwell scale. |
| RB , Rb | Rockwell B scale | Run across Rockwell scale. |
| RC , Rc | Rockwell C scale | See Rockwell calibration. |
| REF or ( )[2] | reference dimension | Encounter Reference dimension. On a technical drawing a dimension or note that is given only for reference and therefore is not intended to be used as a part credence criterion (although information technology may be used as an help to production or inspection). Parenethesis( value ) announce the aforementioned thing and were standartized by ASME. When a dimension is defined in 1 view simply also mentioned again in some other view, it will be given as reference in the 2d case. This rule prevents the mistake of defining it in two different means accidentally; the "main" (non-reference) mention is the only one that counts as a feature definition and thus as a part credence criterion. See too basic dimensions, which are similar in some respects. |
| REQD or REQ'D | required | For case, "4 REQD" written next to a fastener means that four of those fasteners are required for the assembly. |
| REV | revision | Engineering drawings and material or process specifications are oftentimes revised; the usual revision control convention is to label the versions A, B, C, D, etc.; a revision block (rev block) is a tabular area on the drawing (typically in the upper correct corner) that lists the revision letters, a cursory description of the changes and reasons, and approval initials and dates. Revisions beyond "Z" get-go the alphabet once more with doubling, e.g., AA, AB, AC, AD, then on. In the days of manual drafting, redrawing was expensive, so engineering orders (EOs, ECOs, DCNs, ECNs) were not e'er incorporated into a next-letter revision. They thus accompany the drawing equally office of the TDP. With the broadcasting of software usage (CAD, CAM, PDMSs), revision command is often better 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.[5] |
| RFS | regardless of feature size | A material status (or more precisely, liberty from such) in GD&T. Ways that a given geometric tolerance is true in relation to a sure datum regardless of its actual 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 textile authorization | Come across also RTV. |
| RMS | root hateful square | RMS in general is a statistical technique to define a representative value for a group of data points. With regard to surface roughness, it means that the heights of the individual microscopic peaks and valleys shall exist averaged together via RMS to yield a measurement of roughness. Encounter likewise herein f as a finish marker. |
| RT or R/T | rough turn, crude turned; room temperature | Rough-turned means turned on a lathe simply not finished to a final machined dimension and surface roughness. Tin can utilise to bar stock or to parts in-process. Room temperature is sometimes abbreviated "RT" inside tables of specs for finishing operations (plating, painting, etc.). |
| RTP | release to production | The issuance of a drawing from the engineering/design activeness to the production activity. In other words, the event when a draft becomes a completed, official document. A stamp on the cartoon proverb "ISSUED" documents that RTP has occurred. |
| RTV | room-temperature vulcanizing; return to vendor | 1. RTV sealants, a style to seal joints. 2. Render to vendor, transport parts back to a vendor for rework or refund because they are nonconforming. Such RTV often requires an RMA. |
| RZ , Rz | roughness, hateful depth | See surface roughness. |
South [edit] |
| SAE | Formerly the Lodge of Automotive Engineers; now SAE International | And the many standards that information technology issues, for example, the SAE AMS and SAE Equally standards series. |
| SC or S/C | sharp corners | Dimensions may be given equally "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 "S/C" often need non be explicitly added. But in some cases it clarifies the definition. See too TSC, POI, and Air conditioning. |
| SF or S/F | spotface sideslip fit | |
| SFACE or S/FACE | spotface | |
| SHCS | socket caput cap spiral | A cap spiral with a socket caput (usually implying a hex socket, driven with a hex key. |
| SHN | shown | Run across Office number > Symmetrical parts for explanation. |
| SHSS | socket head fix screw | A set up screw with a socket caput (usually implying a hex socket, driven with a hex fundamental. |
| SI | Système international [d'unités] [International System of Units] | The metric organization in its current grade (latest standards). |
| SN or S/North | serial number | |
| SOL ANN | solution amalgamate, 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 | 1. Stainless steel, see also CRES. ii. Supercede/supersedes/superseded, refers to when one certificate (specification, standard, cartoon, etc.) replaces (supersedes) some other (see as well revision command). |
| SST | stainless steel | As per Y14.38–2007 |
| STD | standard | |
| STEP | Standard for the Eastxchange of Product Model Data | A standard format defined by ISO 10303 for MBD information generation, storage, and exchange. |
| STA | solution treated and aged | |
| STI | screw thread insert | |
| STL | steel | |
| STK | stock | A nominal dimension for the stock fabric, such equally bar stock |
| SW | Schlüsselweite | Translates equally Key or Wrench Width. Width across flats, often institute on drawings of German origin. |
T [edit] |
| TAP | tapped hole | Commonly implies drilling a hole if the hole does not already be. |
| TB or T/B | title cake | An area of the drawing, almost always at the bottom right, that contains the title of the drawing and other key information. Typical fields in the title cake include the drawing championship (normally the part proper name); cartoon number (usually the part number); names and/or ID numbers relating to who designed and/or manufactures the part (which involves some complication because design and manufacturing entities for a given part 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 name (come across previous annotate); initials/signatures of the original draftsman (as wells equally the original checker and tracer in the days of manual drafting); initials/signatures of approving managers (issuance/release-to-production data); cross-references to other documents; default tolerancing values for dimensions, geometry, and surface roughness; raw-material info (if not given in a separate listing/bill of materials); and admission command information (information about who is authorized to possess, view, or share copies of the information encoded by the cartoon, e.thousand., classification notices, copyright notices, patent numbers). Drawing revision (versioning) information is not ever included in the title cake because it often appears in a separate revisions block. |
| TCC | time-current curve | |
| TDP | technical data package | The complete bundle of information that defines a role, of which the cartoon itself is often but a subset. It also includes engineering orders (drawing change notices), 3D model datasets, data tables, memoranda, and any 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 example, THRU may be stated in a hole dimension if the hole's finish condition is not clear from graphical representation of the workpiece.[half dozen] |
| THRU ALL | Through all | Like to THRU. Sometimes used on hole dimensions for clarity to denote that the hole extends through multiple open up space features equally 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 | height of steel | |
| TOL | tolerance, tolerancing | |
| TSC | theoretical sharp corner(s) | Come across discussion at SC and POI. |
| TY | type | For an explanation of "type" abbreviated every bit "TY", see the case given at "CL" meaning "grade". |
| TYP [2] | Typical | Other features share the same characteristic. For case, if the drawing shows viii holes on a bolt circle, and just one is dimensioned, with "TYP" or "(TYP)" following the dimension characterization, information technology means that that hole is typical of all 8 holes; in other words, it means that the other 7 holes are that size too. 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 avert any ambiguity or uncertainty. TYP or Typical was described in Mil-Std-eight, the directing trunk prior to adoption of the dimension tolerance interpretation Y14.5 series. Its concluding revision was C in 1963, merely can yet be found in many older aircraft drawings. |
U [edit] |
| UAI | use as-is | I of the possible MRB dispositions. Others include scrap and rework. |
| ULL | nether low limit | This abridgement is used in a machine shop when recording nonconformances. For case, "office scrapped because OD is ULL." See also OHL. |
| UNC | Unified National Coarse | A subset series 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" serial 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 as in aircraft). |
| UNJF | Unified National "J" series Fine | 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). |
| UNO | unless noted otherwise | A fairly well-known abbreviation, but to avoid confusion, spell out. |
| UNS | Unified National Special; unified numbering system | Unified National Special is a subset series of the Unified Thread Standard. It is an extensible series, roofing diverse special threads. The unified numbering system is a vaguely named standard for naming alloys by primary chemical element percentages. |
| UON | unless otherwise noted | A piffling-used (thus not well recognized) abbreviation. To avoid defoliation, spell out. |
| UOS | unless otherwise specified | A adequately well-known abridgement, but to avert confusion, spell out. |
| USASI | United states Standards Plant | Old name for ANSI (1966–1969). |
| USS | Usa Standard; United States Steel | U.Southward. Standard threads became the National serial (e.g., NC, NF, NEF), which became the Unified National series (e.g., UNC, UNF, UNEF); see Unified Thread Standard. As for U.Due south. Steel, it was once the largest steel company on world, often an approved supplier, and not infrequently a sole source; hence its mention on drawings. |
| UTS | ultimate tensile strength; Unified Thread Standard | |
V [edit] |
| five | finish | A letter v (Latin minor letter of the alphabet five) written on a line representing a surface is a style to point that the surface is to be machined rather than left in the equally-cast or as-forged land. The older symbol for this was a small script (italic) f (see herein f). Later the ASA convened upon a letter V (specifically a sans-serif V) touching the surface. Presently this evolved into the "check marking" sign with accompanying number that tells the reader a max roughness value (RMS, microinches or micrometres) for the machined end, to exist measured with a profilometer. |
W [edit] |
| WC | tungsten carbide | The "W" comes from the element symbol for tungsten, W, which comes from the German Wolfram. |
| WI | wrought atomic number 26 | Both the material and the abbreviation are obsolete, or well-nigh so. Spell out the words if this material is to be mentioned at all in mod drawings. |
| W/I, w/i | inside | A little-used abbreviation. Amend to spell out for clarity. |
| West/O, w/o | without | Ameliorate to spell out for clarity. |
| Ten | | |
| _X_ | used to indicate the word "by" | When the letter of the alphabet Ten is preceded by a infinite, this means "by". For instance, a chamfer may be called out as 12 10 45° |
| X [2] or ( ) | number of places—for example, 8X or (8) | When a dimension is used in multiple places either of these prefixes tin exist added to the dimension to define how many times this dimension is used. This example signifies eight places. There should be no whitespace between the numeral and the letter X. (Note on character encoding: Although in typography (including Unicode) the letter X and the multiplication sign (×) are distinct characters with differing glyphs, it is a longstanding tradition in engineering 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.v and Y14.100 are commonly used standards that define all of the symbols and drafting conventions used. |
| YS | yield strength | |
Z [edit] |
0 Response to "Auto Cad Drawing Symbols Circle"
Postar um comentário