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NOTICE: Chart shows bolt thread sizes and corresponding head (wrench) sizes for standard SAE and metric
bolts.
SAE Bolt Thread Sizes
5/16
3/8
in
1
mm
25
8mm
10mm
Metric Bolt Thread Sizes
AG . . . . . . . . . . . . . . . . . . . . Agriculture
ASABE . . . . . . American Society of Agricultural &
Biological Engineers (formerly ASAE)
ASAE . . American Society of Agricultural Engineers
ATF . . . . . . . . . . Automatic Transmission Fluid
BSPP . . . . . . . . . .British Standard Pipe Parallel
BSPTM . . . . . British Standard Pipe Tapered Male
CV . . . . . . . . . . . . . . . . . Constant Velocity
CCW . . . . . . . . . . . . . . . Counter-Clockwise
CW . . . . . . . . . . . . . . . . . . . . . Clockwise
F . . . . . . . . . . . . . . . . . . . . . . . Female
FT . . . . . . . . . . . . . . . . . . . . Full Thread
GA . . . . . . . . . . . . . . . . . . . . . . .Gauge
GR (5, etc.) . . . . . . . . . . . . . . Grade (5, etc.)
HHCS . . . . . . . . . . . . .Hex Head Cap Screw
68 Appendix
BOLT SIZE CHART
1/2
5/8
2
3
50
75
12mm
14mm
ABBREVIATIONS
HT . . . . . . . . . . . . . . . . . . . Heat-Treated
JIC . . . . . Joint Industry Council 37° Degree Flare
LH . . . . . . . . . . . . . . . . . . . . . Left Hand
LT. . . . . . . . . . . . . . . . . . . . . . . . . Left
m . . . . . . . . . . . . . . . . . . . . . . . . Meter
mm . . . . . . . . . . . . . . . . . . . . . Millimeter
M . . . . . . . . . . . . . . . . . . . . . . . . .Male
MPa . . . . . . . . . . . . . . . . . . Mega Pascal
N . . . . . . . . . . . . . . . . . . . . . . . Newton
NC . . . . . . . . . . . . . . . . . .National Coarse
NF . . . . . . . . . . . . . . . . . . . National Fine
NPSM . . . . . . National Pipe Straight Mechanical
NPT . . . . . . . . . . . . . National Pipe Tapered
NPT SWF . . National Pipe Tapered Swivel Female
3/4
4
5
100
125
16mm
ORBM . . . . . . . . . . . . . . O-Ring Boss - Male
P . . . . . . . . . . . . . . . . . . . . . . . . Pitch
PBY . . . . . . . . . . . . . . . . . Power-Beyond
psi . . . . . . . . . . . . . Pounds per Square Inch
PTO . . . . . . . . . . . . . . . . . Power Take Off
QD . . . . . . . . . . . . . . . . . Quick Disconnect
RH . . . . . . . . . . . . . . . . . . . . Right Hand
ROPS . . . . . . . . Roll-Over Protective Structure
RPM . . . . . . . . . . . . . Revolutions Per Minute
RT . . . . . . . . . . . . . . . . . . . . . . . Right
SAE . . . . . . . . Society of Automotive Engineers
UNC . . . . . . . . . . . . . . . . . Unified Coarse
UNF . . . . . . . . . . . . . . . . . . . Unified Fine
UNS . . . . . . . . . . . . . . . . . Unified Special
7/8
6
7
150
175
18mm
MAN1331
( 09/29/22 )
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