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4 PN-53661 (Rev. 12/96)
BOLT SIZE CHART
NOTE: Chart shows bolt thread sizes and corresponding head (wrench) sizes for standard SAE and Metric Bolts.
8MM 10MM 12MM 14MM 16MM 18MM
175150125100755025
IN
MM
1
7
65432
7/83/45/81/23/85/16
SAE Bolt Thread Sizes
Metric Bolt Thread Sizes
ABBREVIATIONS
ATF Automatic Transmission Fluid. . . . . . . . .
CE Conforms to European. . . . . . . . . . . . . . . .
Community Machinery Safety
Directive 89/392/EEC
CV Constant Velocity. . . . . . . . . . . . . . . . . . . .
F Female. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GA Gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GR (5, etc.) Grade (5, etc.). . . . . . . . . . . . . . .
GPM Gallons Per Minute. . . . . . . . . . . . . . . . .
HT Heat Treated. . . . . . . . . . . . . . . . . . . . . . . .
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 Thread. . . . . . . . . . . . . . .
P Pitch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
psi Pounds per Square Inch. . . . . . . . . . . . . .
PTO Power Take Off. . . . . . . . . . . . . . . . . . . .
ROPS Roll Over Protective. . . . . . . . . . . . . . .
Structure
SAE Society of Automotive. . . . . . . . . . . . . .
Engineers
UNC Unified Coarse. . . . . . . . . . . . . . . . . . . . .
UNF Unified Fine. . . . . . . . . . . . . . . . . . . . . . .
UNS Unified Special. . . . . . . . . . . . . . . . . . . .