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NAS1306-21
Machine Bolt
Description
Fastener Length: 1-57/64", Thread: 3/8-24, Thread Length: 19/32"
Specifications
| Fastener Length | 1.875 inches minimum and 1.905 inches maximum |
|---|---|
| Features Provided | Finished head |
| Grip Length | 1.302 inches minimum and 1.322 inches maximum |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Height | 0.188 inches minimum and 0.203 inches maximum |
| Head Style | Hexagon Head |
| Length | 1 57/64 |
| 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) | 16000 pounds per square inch |
| Specification Data | 80205-nas1306 professional/industrial association standard |
| Surface Finish | 32.0 microinches grip, 63.0 microinches bearing surface of head |
| 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 | 0.375 |
| Thread Direction | Right-hand |
| Thread Length | 0.553 inches minimum and 0.603 inches maximum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 3/8 |
| Width Between Flats | 0.553 inches minimum and 0.564 inches maximum |
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for NAS1306-21 — functionally equivalent.
- NAS6606-21 Listed alternate 24.00-24 · 1-7/8 in · Dished hexagon · Steel
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Catalog data updated 2026-07-05. Report a data error