BOLT SIZE CHART
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 | 1/2 | 5/8 | 3/4 | 7/8 |
IN | 1 |
|
|
|
|
| 2 |
|
|
|
| 3 |
|
| 4 |
|
|
| 5 |
|
| 6 |
|
|
| 7 | ||||||||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
MM | 25 |
|
|
|
|
| 50 |
|
|
|
| 75 |
|
| 100 |
|
|
| 125 |
|
| 150 |
|
|
| 175 |
Metric Bolt Thread Sizes
8MM 10MM | 12MM | 14MM | 16MM | 18MM |
|
|
|
|
|
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
4 |