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NAS1304-20D
Bolt
Description
Fastener Length: 1-43/64", Thread: 1/4-28, Thread Length: 27/64"
Specifications
| Distance From Head Largest Bearing Surface To Shank Hole Center | 1.497 inches nominal first hole |
|---|---|
| Fastener Length | 1.675 |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 1.250 |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Height | 0.125 |
| Head Style | Dished hexagon |
| Length | 1 43/64 |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec 1st material response or mil-s-5000 mil spec 2nd material response or mil-s-8503 mil spec 3rd material response or mil-s-6098 mil spec 4th material response or mil-s-6049 mil spec 5th material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Shank Unthreaded Hole Diameter | 0.076 inches nominal first hole |
| 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 | 0.425 inches minimum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| 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 NAS1304-20D — functionally equivalent.
- NAS6604D20 Listed alternate 1/4-28 · 1.69 in · Dished hexagon · Steel
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- NAS6704D20 NAS 1/4-28 · 0.073 in · Dished hexagon · Iron
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Catalog data updated 2026-07-05. Report a data error