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Appendix 25
Bolt Torque & Size Charts (Rev. 10/10/2005)
BOLT SIZE CHART
NOTE: Chart shows bolt thread sizes and corresponding head (wrench) sizes for standard SAE and metric bolts.
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
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