screws › machine screws
AN525-416-8
Aeronautical Standard Machine Screw
Description
AN 525-416-8 Washer Head Machine Screw
Specifications
| Extended Washer Diameter | 0.490 inches minimum and 0.510 inches maximum |
|---|---|
| Extended Washer Thickness | 0.028 inches minimum and 0.033 inches maximum |
| Fastener Length | 0.500 |
| Finish | Cadmium ll |
| Grip Length | 1/8 |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Diameter | 0.427 inches minimum and 0.447 inches maximum |
| Head Height | 0.096 inches minimum and 0.106 inches maximum |
| Head Style | Round extended washer, Washer Head |
| Internal Drive Style | Slot |
| Length | 1/2 |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Screw Material | Steel comp 8630 or steel comp 4037 |
| Screw Material Specification | Mil-s-6050 mil spec 1st material response or ams 6300 assn std 2nd material response |
| Screw Surface Treatment Specification | Qq-p-416 fed spec 1st treatment response or qq-z-325 fed spec 2nd treatment response |
| Size | 1/4-28 |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.375 inches minimum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
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 AN525-416-8. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error