screws › close tolerance screws
HT239PB4-4
Screw
Description
Fastener Length: 9/16", Thread: 1/4-28, Thread Length: 21/64"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 0.556 inches minimum and 0.576 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 0.240 inches minimum and 0.260 inches maximum |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Diameter | 0.390 inches minimum and 0.395 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | High-torque |
| Length | 9/16 |
| Material | Steel |
| Material Specification | Mil-s-5626 mil spec 1st material response or mil-s-5400 mil spec 2nd material response or mil-s-8503 mil spec 3rd material response or mil-s-6098 mil spec 4th material response or mil-s-6049 mil spec 5th material response or mil-s-6758 mil spec 6th material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Surface Finish | 63.0 microinches grip |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416,ty 2 cl 3 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.296 inches minimum and 0.336 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.
- HT239PB4-4
- HT239PB4-5
- HT239PB4-8
- HT239PB4-9
- HT239PB4-12
Cross-reference
No interchangeable or dimensionally similar parts are on record for HT239PB4-4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error