altre abbreviazioni nelle note (I - N)

painaz

Utente Standard
Professione: ingegnere
Software: proe
Regione: veneto
#1
I

IAW in accordance with A common need in engineering drawings is to instruct the user to do activity X in accordance with technical standard Y. For example, "Weld all subassemblies IAW AWS XYZ.123" means "Weld all subassemblies in accordance with American Welding Society 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 sheet metal per MIL-PRF-123456" or "[...] IAW MIL-PRF-123456". Part of the motivation behind the choice of words "in accordance with" is that they do not allege 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 merely instruct the user that whatever s/he does must not contradict the standard in any way. But this is a subtle connotative distinction, and "per" and "IAW" are denotatively equivalent.
ID inner diameter; identity, identification number
ISO International Organization for Standardization And the many standards that it specifies, for example, ISO 10303
J
K
KEY key Drawing callouts marked "KEY" define "key characteristics" that are considered especially important for fit, function, safety, or other reasons. They are thus subjected to higher inspection sampling levels.
KPSI, kpsi kilopounds per square inch, that is, thousands of pounds per square 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 non-SI measurement scale for ultimate tensile strength, that is, the number of units of tensile force that a material can endure per unit of cross-sectional 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
LH left-hand Referring to handedness, such as 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 called a bill of materials (BoM, BOM). Overlaps a lot in concept with a parts list (PL or P/L). There is no consistently enforced distinction 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 part. Thus an internal feature of size (e.g., a hole) at its biggest diameter, or an external feature of size (e.g., 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 certain FoS datum being at LMC or at MMC.
M
MACH machine; machined
MAJ major As in major diameter, or major characteristic (for sampling level)
MAX[2] maximum
MBD model-based definition Definition of the part via a 3D CAD model rather than via a 2D engineering drawing. Drawings may be printed (plotted) from the model for reference use, but 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) (see also MBP, MOP, MOW)
MF or M/F make from When one part number is made from another, it means to take part A and machine some additional features into it, creating part B. The parts list or L/M, in the "material" field, will say "M/F PN 12345".
MFD manufactured
MFG manufacturing
MFR manufacturer May be the same entity as 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 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; minor
MMC maximum 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 most material left on the part. Thus an internal feature of size (e.g., a hole) at its smallest diameter, or an external feature 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 be 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) (synonymous with MOW, measurement over wires)
MOW, MoW measurement over wires threads, splines, gears (external, male) (see also MBW, MBP, MOP)
MPa, MPA megapascals The common SI measurement scale for ultimate tensile strength (UTS), that is, the number of units of tensile force that a material can endure per unit of cross-sectional area before breaking. There is only one correct casing for the symbol, cap-M-cap-P-small-a, which, like any SI unit of measurement symbol, properly should be preserved even when surrounding text is styled in all caps (which latter is a frequently employed tradition in engineering drawing). But it is not uncommon to see "MPA" through carelessness. Users are not confused regardless. In non-SI terms, the unit for UTS is the KSI (or ksi), which see herein.
MRB material review board A committee that reviews some nonconforming materials which are submitted as potentially still usable/saleable (if the nonconformance does not hinder fit or function).
MS- [U.S.] 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 also AN- and NAS.)
N
NAS National Aerospace Standards Standards maintained by SAE International and widely used in the aerospace manufacturing industries. The "National" formerly implicitly referenced the USA, 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 Coarse; numerical control The [U.S.] National Coarse series of pre-1949 corresponds today to the Unified National Coarse (UNC) of the Unified Thread Standard.
NCM nonconforming material(s) This abbreviation is used in a machine shop when recording nonconformances (out of tolerance, etc.). For example, "An NCM tag was tied to the scrap part."
NCR nonconformance report A report listing nonconformances (out of tolerance, etc.). Helps to analyze system weaknesses (such as worn-out equipment, operators in need of more training, or risky practices).
NEC not elsewhere classified; National Electrical Code In the sense of "not elsewhere classified", the abbreviation is well-known within certain fields, but not others; to avoid confusion, spell out. The National Electrical Code is a standard for electrical 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[2] nominal
NORM or NORMD normalized referring to normalization, a stress-relieving heat treatment. See also HT TR.
NPS Naval Primary Standard[3] (Not to be confused with annotating strait pipe. This should be abbreviated 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 series; see Unified Thread Standard. An extensible series, covering various special threads. 2. Near side: The drawing notations "near side" and "far side" tell the reader which side of the part a feature is on, in occasional contexts where that fact is not communicated using the rules of projection alone. Contexts of usage are rather limited. See "far side" for examples.
NSCM National Stock/Supply Code for Manufacturers An older name for "CAGE code". Also FSCM (Federal Stock/Supply Code for Manufacturers).
N&T or N/T or NT normalized and tempered A form of heat treatment in which the metal is first normalized (stress-relieved) and then tempered. Compare H&T.
NTS not to scale See also Engineering drawing > Scale.