screws › machine screws
7S39-4A7
Screw
Description
Fastener Length: 7/8", Thread: 1/4-28, Thread Length: 7/16"
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | 0.862 |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Diameter | 0.389 inches minimum and 0.394 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 55/64 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp 4130 |
| Screw Material Specification | Mil-s-6758 mil spec single material response |
| Screw Surface Treatment | Cadmium |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.425 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 7S39-4A7. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error