bolts › machine bolts
MS9557-13
12 Point Machine Bolt
Description
12 Point Machine Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Extended Washer Diameter | 0.438 |
| Extended Washer Thickness | 0.060 inches minimum and 0.070 inches maximum |
| Fastener Length | 0.938 |
| Features Provided | Finished head |
| Grip Length | 0.128 inches minimum and 0.188 inches maximum |
| Head Height | 0.300 |
| Head Style | Double hexagon extended washer |
| Length | 15/16 |
| Material | Iron |
| Material Specification | Ams 5731 assn std single material response |
| Minimum Yield Strength | 85000 pounds per square inch |
| NIIN | 00-079-1299 |
| NSN | 5306-00-079-1299 |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches grip, 32.0 microinches threads |
| Thread Class | 2a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.750 inches minimum and 0.810 inches maximum |
| Thread Qty Per Inch (tpi) | C8 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Weight | 0.02 lb |
| Width Between Flats | 0.305 inches minimum and 0.313 inches maximum |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS9557-13. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error