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AN25-21A
Aeronautical Standard Bolt
Description
Fastener Length: 1-11/32", Thread: 1/4-24, Thread Length: 1/4"
Specifications
| Fastener Length | 1.359 |
|---|---|
| Groove Diameter | 0.245 inches minimum and 0.255 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Diameter | 0.625 |
| Head Height | 0.156 |
| Head Style | Button |
| Internal Drive Style | Slot |
| Length | 1 11/32 |
| 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-6758 mil spec 5th material response or ams 6300 assn std 6th material response |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Single Shear Strength | 5750 pounds per square inch |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.277 inches minimum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
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Catalog data updated 2026-07-05. Report a data error