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Appendix 25
Bolt Torque & Size Charts (Rev. 8/14/02)
BOLT SIZE CHART
NOTE: Chart shows bolt thread sizes and corresponding head (wrench) sizes for standard SAE and metric bolts.
5/16 3/8 1/2 5/8 3/4 7/8
SAE Bolt Thread Sizes
MM 25 50 75 100 125 150 175
IN 1 7
Metric Bolt Thread Sizes
8MM 18MM14MM12MM10MM 16MM
2
34
5
6
ABBREVIATIONS
AG.............................................................Agriculture
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
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
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