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NAS6604-26
Close Tolerance Bolt
Description
Close Tolerance Bolt
Specifications
| Alternate Part Number | NAS1304-26 |
|---|---|
| Country of Origin | USA |
| Drilling | Undrilled Head |
| Fastener Length | 2.035 inches minimum and 2.065 inches maximum |
| Grip | 1.625 in |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 1.615 inches minimum and 1.635 inches maximum |
| Grip Tolerance | ±0.010 in |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Height | 0.125 inches minimum and 0.140 inches maximum |
| Head Style | Dished hexagon |
| Head Type | Hexagon |
| Industry Standards/Certification | NAS6604 |
| Length | 2 1/16, 2.050 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 |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| NIIN | 01-133-0170 |
| NSN | 5306-01-133-0170 |
| Specification Data | 80205-nas6604 professional/industrial association standard |
| 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,type 2 class 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 | 0.429 inches minimum and 0.439 inches maximum |
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for NAS6604-26 — functionally equivalent.
- NAS1304-26 Listed alternate 1/4-28 · 0.086 in · Dished hexagon · Steel
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Catalog data updated 2026-07-05. Report a data error