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° Degree Flare
LH................................................................. Left Hand
LT ...........................................................................Left
m ........................................................................ Meter
mm ............................................................... Millimeter
M .......................................................................... Male
34 Appendix
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
Bolt Torque & Size Charts (Rev. 3/28/2007)
7/8
7
6
150
175
18MM