altre abbreviazioni nelle note (S - Z)


Utente Standard
Professione: ingegnere
Software: proe
Regione: veneto
SAE Formerly the Society of Automotive Engineers; now SAE International And the many standards that it issues, for example, 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 implied by default, so "S/C" often need not be explicitly added. But in some cases it clarifies the definition. See also TSC, POI, and AC.
SF or S/F spotface
SFACE or S/FACE spotface
SHCS socket head 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 set screw A set screw with a socket head (usually 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 S/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 1. Stainless steel, see also CRES. 2. Supersede/supersedes/superseded, refers to when one document (specification, standard, drawing, etc.) replaces (supersedes) another (see also revision control).
SST stainless steel A somewhat unusual abbreviation; spell out for clarity. "SS" or "CRES" are more likely to be recognized with certainty.
STD Standard
STEP Standard for the Exchange of Product Model Data A standard format defined by 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 material, such as bar stock
TAP Tapped hole Usually implies drilling a hole if the hole does not already exist.
TB or T/B title block 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 block include the drawing title (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 because design 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 property—see CDA and ODA); company name (see previous comment); initials/signatures of the original draftsman (as wells as the original checker and tracer in the days of manual drafting); initials/signatures of approving managers (issuance/release-to-production information); cross-references to other documents; default tolerancing values for dimensions, geometry, and surface roughness; raw-material info (if not given in a separate list/bill of materials); and access control information (information about 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 because it often appears in a separate revisions block.
TDP technical data package The complete package of information that defines a part, of which the drawing itself is often only 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
THK or thk thickness
THRU Through Optionally applied to a hole dimension to signify that the hole extends through the workpiece. For example, THRU may be stated in a hole dimension if the hole's end condition is not clear from graphical representation of the workpiece.[6]
THRU ALL Through all Similar to THRU. Sometimes used on hole dimensions for clarity to denote that the hole extends through multiple open space features as it goes through the whole workpiece.[7]
Ti titanium
TiN titanium nitride [plating]
TIR total indicator reading; total indicated run-out For measurements of eccentricity and other deviations from nominal geometry
TOL tolerance, tolerancing
TSC theoretical sharp corner(s) See discussion at SC and POI.
TY type For an explanation of "type" abbreviated as "TY", see the example given at "CL" meaning "class".
TYP[2] Typical Other features share the same characteristic. For example, if the drawing shows 8 holes on a bolt circle, and just one is dimensioned, with "TYP" or "(TYP)" following the dimension label, it means that that hole is typical of all 8 holes; in other words, it means that the other 7 holes are that size also. The latest revisions of Y14.5 deprecate "TYP" by itself in favor of the specifying of a number of times, such as "2X" or "8X". This helps avoid any ambiguity or uncertainty. TYP or Typical was describe in Mil-Std-8, the directing body prior to adoption of the dimension tolerance interpretation Y14.5 series. Its last revision was C in 1963, but can still be found in many older aircraft drawings.
UAI use as-is One of the possible MRB dispositions. Others include scrap and rework.
ULL under low limit This abbreviation is used in a machine shop when recording nonconformances. For example, "part 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 series of the Unified Thread Standard.
UNJC Unified National "J" series Coarse A subset series of the Unified Thread Standard, with controlled root radius and increased minor diameter. For applications requiring maximum fatigue resistance amid chronic vibration (such 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 as in aircraft).
UNS Unified National Special; unified numbering system Unified National Special is a subset series of the Unified Thread Standard. It is an extensible series, covering various special threads. The unified numbering system is a vaguely named standard for naming alloys by principal element percentages.
UON unless otherwise noted A little-used (thus not well recognized) abbreviation. To avoid confusion, spell out.
UOS unless otherwise specified A fairly well-known abbreviation, but to avoid confusion, spell out.
USASI United States of America Standards Institute Former name for ANSI (1966–1969).
USS United States Standard; United States Steel U.S. Standard threads became the National series (e.g., NC, NF, NEF), which became the Unified National series (e.g., UNC, UNF, UNEF); see Unified Thread Standard. As for U.S. Steel, it was once the largest steel company on earth, often an approved supplier, and not infrequently a sole source; hence its mention on drawings.
UTS ultimate tensile strength; Unified Thread Standard
v finish A letter v (Latin small letter v) written on a line representing a surface is a way to indicate that the surface is to be machined rather than left in the as-cast or as-forged state. 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. Soon 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.
WC tungsten carbide The "W" comes from the element symbol for tungsten, W, 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 material is to be mentioned at all in modern drawings.
W/I, w/i within A little-used abbreviation. Better to spell out for clarity.
W/O, w/o without Better to spell out for clarity.
_X_ used to indicate the word “by” When the letter X is preceded by a space, this means "by". For example, a chamfer may be called out as 12 X 45°
X[2] or ( ) number of places—for example, 8X or (8) 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 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.)
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 strength