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NOTE: 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
Metric Bolt Thread Sizes
8MM
10MM
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
HT........................................................... Heat-Treated
JIC ............................. Joint Industry Council 37° Flare
LH................................................................. Left Hand
LT............................................................................Left
m ........................................................................ Meter
mm ............................................................... Millimeter
M ..........................................................................Male
Bolt Torque & Size Charts (Rev. 3/28/2007)
BOLT SIZE CHART
1/2
5/8
2
3
50
75
12MM
ABBREVIATIONS
3/4
4
5
100
125
14MM
16MM
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
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
Appendix 63
7/8
7
6
150
175
18MM
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