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Common Fastener Related Abbreviations
&NT |
With
Nut |
AN |
Precedes a dimensional specification for aircraft fasteners developed by the Aeronautical Standards Group. |
| ASTM |
American
Society for Testing and Materials. Used preceding a standard
number developed by that group. |
| BR |
Brass |
| BSF |
British
Standard Fine |
| BSW |
British
Standard Whitworth |
| BT |
Bolt
(on drawings) |
| C |
National
Coarse Thread |
| CL |
Class
(Metric Material/Strength Specification) |
| CR |
Chrome |
| CSS |
Counter
Sunk Screw (flat or oval head) |
| CT |
Course
Thread |
| DIN |
An abbreviation
for Deutsches Institut für Normung, the German standards
body. In reference to fasteners DIN indicates fasteners
that conform to a specific metric standard (will be followed
by the standard number). |
| F |
Fully
Threaded |
| FH |
Flat
Head |
| FIL |
Fillister
Head |
| FIN |
Finishing
(Washer) |
| FNDR |
Fender
(Washer) |
| FT |
Fine
Thread, Fully Threaded |
| G |
Grade |
| Galv. |
Galvanized |
| Galvi |
Galvanized
|
| GR |
Grade |
| GV |
Galvanized |
| HD |
Head |
| HHMB |
Hex
Head Machine Bolt |
| HVHX |
Heavy
Pattern Hex Bolt |
| HX |
Hex |
| JMNT |
Jam
Nut |
| LB |
Lag
Bolt, weight in pounds |
| LH |
Left Hand Thread |
| LW |
Lock
Washer |
| M |
Metric |
| MB |
Machine
Bolt |
| MS |
Machine
Screw |
| MSNT |
Machine
Screw Nut |
| NC |
National
Coarse Thread |
| NF |
National
Fine Thread |
| NT |
Nut |
| OH |
Oval
Head |
| OV |
Oval
Head |
| P |
Philips |
| PH |
Philips
Head |
| Phil. |
Philips Drive |
| PN |
Pan
Head |
| PT |
Partial
Thread |
| RD |
Round
Head |
| RH |
Round
Head, or Right Hand Thread |
| S |
Slotted |
| S/S |
Stainless
Steel |
| SAE |
SAE Pattern (Washers) These washers have a smaller outside
diameter than USS pattern washers, Also used to indicate
US Fine Thread |
| SBR |
Silicon
Bronze |
| SD |
Square
Drive |
| SEMS |
A type
of pre-made screw and washer assembly |
| SKT |
Socket |
| SL |
Slotted |
| Slot. |
Slotted
Drive |
| SMS |
Sheet
Metal Screw |
| SQ |
Square |
| SS |
Stainless
Steel, Set Screw |
| USS |
USS
Pattern (washers). These washers have a larger outside
diameter than SAE pattern washers, Also used to indicate
US Course Thread |
| WS |
Wood
Screw |
| Z |
Zinc |
|