bolts › machine bolts
AN5-27A
Aeronautical Standard Machine Bolt
Description
Airframe Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Drilling | Undrilled Head |
| Fastener Length | 2.969 |
| Features Provided | Finished head |
| Grip | 2 7/16 in |
| Grip Length | 2 7/16, 2.438 |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.172 inches minimum and 0.204 inches maximum |
| Head Style | Hexagon Head |
| Industry Standards/Certification | AN5 |
| Length | 2 31/32 in |
| Material | Steel |
| Material Specification | Mil-b-6812 mil spec all material responses |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Nominal Length | 2 31/32 |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,ty 2,class 3 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.531 inches minimum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 1/4, 5/16-24 |
| Weight | 0.07 lb |
| Width Between Flats | 0.490 inches minimum and 0.502 inches maximum |
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- AN5-27 AN 1/4-24 · 0.086 in · Hexagon Head · Steel
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error