bolts › close tolerance bolts
NAS1578A5R31
Close Tolerance Bolt
Description
Fastener Length: 2-29/64", Thread: 1/4-24, Thread Length: 1/2
Specifications
| Fastener Length | Between 2.424 inches and 2.454 inches |
|---|---|
| Grip Diameter | Between 0.311 inches and 0.312 inches |
| Grip Length | Between 1.928 inches and 1.948 inches |
| Head Diameter | Between 0.597 inches and 0.612 inches |
| Head Height | Between 0.176 inches and 0.183 inches |
| Head Style | Pan Head |
| Internal Drive Style | Offset cruciform (torque set) |
| Material | Steel |
| Material Specification | Mil-s-5626 military specification 1st material response or ams6415 assn standard 2nd material response or mil-s-5000 military specification 3rd material response or mil-s-6049 military specification 4th material response |
| Surface Treatment | Cadmium |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.501 |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1578A5R31. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error