screws › machine screws
642AS0748
Screw
Description
Fastener Length: 43/64", Thread: 1/4-20, Head Width: 5/32", Thread Length: 31/64"
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | 0.636 inches minimum and 0.676 inches maximum |
| Head Diameter | 0.4640 inches minimum and 0.5066 inches maximum |
| Head Height | 0.070 inches minimum and 0.073 inches maximum |
| Head Style | Flat countersunk undercut |
| Internal Drive Style | Hexagon |
| Length | 43/64 |
| Locking Feature | Pellet threads |
| Material | Iron |
| Material Specification | Ams5732 assn std single material response or ams5737 assn std single material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Special Features | Furnished with one o ring |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35,ty 1,ty 2,ty 3 or ty 6 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.449 inches minimum and 0.489 inches maximum |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNJC |
| Thread Size | 1/4 |
| Width Across Flats | 0.1562 inches minimum and 0.1585 inches maximum |
Cross-reference
No interchangeable or dimensionally similar parts are on record for 642AS0748. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error