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
coarse
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
Phillips
PH
Phillips
Head
Phil.
Phillips 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 coarse Thread
WS
Wood
Screw
Z
Zinc
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