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AN7-51A
Aeronautical Standard Machine Bolt
Description
Airframe Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Drilling | Undrilled Head |
| Fastener Length | 5.204 inches minimum and 5.250 inches maximum |
| Features Provided | Finished head |
| Grip | 4 9/16 in |
| Grip Length | 4.548 inches minimum and 5.578 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.234 inches minimum and 0.266 inches maximum |
| Head Style | Hexagon Head |
| Head Type | Hexagon |
| Industry Standards/Certification | AN7 |
| Length | 5 1/4, 5 7/32 in |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| NIIN | 01-116-1188 |
| NSN | 5306-01-116-1188 |
| 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 | 0.438 |
| Thread Direction | Right-hand |
| Thread Length | 0.626 inches minimum and 0.702 inches maximum |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNF |
| Thread Size | 7/16-20 |
| Weight | 0.24 lb |
| Width Between Flats | 0.615 inches minimum and 0.627 inches maximum |
Cross-reference
No interchangeable or dimensionally similar parts are on record for AN7-51A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error