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My Account Product Search Product Catalog Metric Coarse Class 8.8Metric Set Screws 8.8Metric Coarse Class 10.9Metric Set Screws 10.9Metric Fine 8.8Metric Fine 10.9Grade 5 UNFGrade 5 Set Screws UNFGrade 5 UNCGrade 5 Set Screws UNCGrade 8 UNFGrade 8 UNCGrade C LocknutsGrade 9NylocsWashersSpecialsBrassCapscrewsFlangeFlange NutsGrade 8 UNC Plow BoltsKemtekLocknuts/ConelocksMetalfixRivetsRivnutsRivtecSpectrumStainless SteelStudsWing Nuts
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Common Fastener Abbreviations

This technical information has been supplied by boltdepot.com

Abbreviation Meaning

&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