bolts › shear bolts
NAS6604-21
Close Tolerance Bolt
Description
NAS6604 Shear Bolts Thread 1/4-28
Specifications
| Alternate Part Number | NAS1304-21 |
|---|---|
| Country of Origin | USA |
| Drilling | Undrilled Head |
| Fastener Length | 1.722 inches minimum and 1.752 inches maximum |
| Grip | 1.312 in |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 1.302 inches minimum and 1.322 inches maximum |
| Grip Tolerance | ±0.010 in |
| Head Height | 0.125 inches minimum and 0.140 inches maximum |
| Head Style | Undercut hexagon |
| Head Type | Hexagon |
| Industry Standards/Certification | NAS6604 |
| Length | 1 3/4, 1.737 in |
| Material | Steel |
| Material Specification | Mil-s-5000 mil spec 1st material response or mil-s-6049 mil spec 2nd material response or ams6322 assn std 2nd material response |
| NIIN | 01-160-7560 |
| NSN | 5306-01-160-7560 |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,ty 2,cl 2 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.400 inches minimum and 0.450 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 0.2500-28, 1/4 |
| Weight | 0.003 lb |
| Width Between Flats | 0.430 inches minimum and 0.439 inches maximum |
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for NAS6604-21 — functionally equivalent.
- NAS1304-21 Listed alternate
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Catalog data updated 2026-07-05. Report a data error