BOLT SIZE CHART
Bolt Size Chart
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
Abbreviations
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.)
42
1/2
5/8
2
3
50
75
12mm
14mm
HHCS
Hex Head Cap Screw
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
P
PBY
psi
PTO
QD
RH
ROPS
RPM
RT
SAE
UNC.
UNF
UNS
7/8
6
7
150
175
18mm
O-Ring Boss - Male
Pitch
Power-Beyond
Pounds per Square Inch
Power Take Off
Quick Disconnect
Right Hand
Roll-Over Protective Structure
Revolutions Per Minute
Right
Society of Automotive Engineers
Unified Coarse
Unified Fine
Unified Special