&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
BritishStandard 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