bolts › close tolerance bolts
AN174H25A
Aeronautical Standard Bolt
Description
Fastener Length: 2-11/16", Hole Diameter: 1/32", Thread: 1/4-28, Thread Length: 1/2"
Specifications
| Fastener Length | 2.640 inches minimum and 2.687 inches maximum |
|---|---|
| Grip Diameter | 0.2487 inches minimum and 0.2492 inches maximum |
| Grip Length | 2.172 inches minimum and 2.204 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.140 inches minimum and 0.172 inches maximum |
| Head Style | Hexagon Head |
| Hole Configuration Style | Hexagon flats |
| Hole Diameter | 0.046 |
| Hole Quantity | 1 |
| Hole Type | Drilled |
| Length | 2 11/16 |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Surface Finish | 63.0 microinches bearing surface of head, 63.0 microinches grip |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,ty 2,cl 3 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.436 inches minimum and 0.515 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 AN174H25A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error