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- Hex Head Airframe Bolts come in either drilled or undrilled shank versions
- Threads are pressed into the steel, not cut, thus maintaining strength throughout the entire shank
- The surface under the head of AN bolts is designed to be a bearing surface to reduce non-uniform stress as the bolt is torqued thus reducing premature fatigue
Type | Hex Head Airframe Bolt |
Style | AN4 |
Size | 1/4"-28 |
Length | 2-25/32" |
Material | Steel |
Dia. Max | 0.249 |
Dia. Min | 0.246 |
Head Style | Hex Head |
Wrench Size | 7/16" |
Shank Hole | 0.076 |
Head Hole | None |
Min Tensile Strength | 125,000 psi |
Grip | 2-5/16 |
Finish Spec | QQ-P-416, Type II, Grade/Class 3 |
Compatible Washer | AN960-416 or AN970-4 |
Compatible Nut | AN365-428 |
Fits Cotter Pin | AN380-2-2/MS24655-132 or longer |
Thread Type | UNF-3A |
Length | 0.469 |
AN Part No. | AN4-26 |