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NAS428-4A20
Bolt
Description
Fastener Length: 2-1/16", Thread: 1/4-28, Thread Length: 1-63/64"
Specifications
| Fastener Length | 2.000 inches minimum and 2.062 inches maximum |
|---|---|
| Features Provided | Finished head |
| Grip Length | 0.031 inches minimum and 0.062 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.131 inches minimum and 0.151 inches maximum |
| Head Style | Crowned hexagon |
| Length | 2 1/16 |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec 1st material response or mil-s-6049 mil spec 2nd material response or mil-s-6050 mil spec 3rd material response or mil-s-6098 mil spec 4th material response or mil-s-6758jhams mil spec 5th material response |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Specification Data | 80205-nas428 professional/industrial association standard |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,type 2,class 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 1.938 inches minimum and 2.031 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Between Flats | 0.428 inches minimum and 0.440 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS428-4A20. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error