screws › machine screws
7S39-4A4
Screw
Description
Fastener Length: 43/64", Thread: 1/4-28, Thread Length: 13/32"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 0.660 inches minimum and 0.690 inches maximum |
| 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 ii |
| Length | 11/16 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp 4130 |
| Screw Material Specification | Mil-s-6758,cond d4 mil spec single material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416,type 2class 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.400 inches minimum and 0.450 inches maximum |
| 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 7S39-4A4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error