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MS21125B411
Military Standard Bolt
Description
Fastener Length: 1-7/64", Thread: 1/4-28, Thread Length: 9/32"
Specifications
| Distance From Head Largest Bearing Surface To Shank Hole Center | 1.011 inches minimum first hole and 1.031 inches maximum first hole |
|---|---|
| Fastener Length | 1.106 inches minimum and 1.126 inches maximum |
| Grip Diameter | 0.2487 inches minimum and 0.2492 inches maximum |
| Grip Length | 0.688 inches minimum and 0.704 inches maximum |
| Head Diameter | 0.477 inches minimum and 0.492 inches maximum |
| Head Height | 0.126 inches minimum and 0.141 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Slot |
| Length | 1 1/8 |
| Locking Feature | Detent ball fastener |
| Shank Unthreaded Hole Diameter | 0.076 inches minimum first hole and 0.086 inches maximum first hole |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches grip |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.277 inches minimum and 0.328 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error