bolts › machine bolts
MS9557-07
Military Standard Machine Bolt
Description
Fastener Length: 1/2", Thread: 1/4-28, Thread Length: 7/16
Specifications
| Extended Washer Diameter | 0.438 |
|---|---|
| Extended Washer Thickness | 0.060 |
| Fastener Length | 0.562 |
| Grip Length | Between 0.079 inches and 0.099 inches |
| Head Height | 0.300 |
| Head Style | Double hexagon w/hole |
| Length | 1/2 |
| Material | Iron |
| Material Specification | Ams5731-85 assn standard single material response |
| Specification Data | 96906-ms9557 government standard |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.463 |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
| Width Between Flats | 0.348 |
Cross-reference
No interchangeable or dimensionally similar parts are on record for MS9557-07. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error