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AN4-6A
Aeronautical Standard Machine Bolt
Description
Airframe Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Drilling | Undrilled Head |
| End Application | Phoenix (aim-54) air-to-air hc-130); missile ec-130e mc-130h sof (ac-130h harpoon (agm-84); aircraft all-weather anti-ship ec-135h/k/p); missile aircraft tf33-pw-102 (c-135e t56-a-7/15 (c-130b/e/h/n/p); close in weapon system (ciws-phalanx); engine aircraft b-52h); engine aircraft tf33-p-3/5/9 (c/ec-135 mini-sace; engine b-1 aircraft; test consoles w/s:support equipment |
| Fastener Length | 0.781 |
| Features Provided | Finished head |
| Grip | 5/16 in |
| Grip Length | 0.383, 5/16 |
| Hardness Rating | 26.0 rockwell c and 32.0 rockwell c |
| Head Height | Between 0.140 inches and 0.172 inches |
| Head Style | Hexagon Head |
| Head Type | Hexagon |
| Industry Standards/Certification | AN4 |
| Length | 25/32 in, 3/4 |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| NIIN | 00-151-1426 |
| NSN | 5306-00-151-1426 |
| Nominal Length | 25/32 |
| Pre-Packaged Bag Quantity | 100 |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Class 3 federal specification all treatment responses type 2 qq-p-416 |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.397 |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 1/4-28 |
| Weight | 0.02 lb |
| Width Between Flats | Between 0.428 inches and 0.440 inches |
Cross-reference
No interchangeable or dimensionally similar parts are on record for AN4-6A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error