screws › close tolerance screws
NAS1578A4T6
Close Tolerance Screw
Description
length: 0.778", thread: 1/4-28, flat pan head, alloy steel offset cruciform, NAS1578 series screw
Specifications
| Fastener Length | Between 0.763 inches and 0.793 inches |
|---|---|
| Grip Diameter | Between 0.2485 inches and 0.2495 inches |
| Grip Length | Between 0.367 inches and 0.385 inches |
| Hardness Rating | 36.0 rockwell c and 40.0 rockwell c |
| Head Diameter | Between 0.477 inches and 0.492 inches |
| Head Height | Between 0.140 inches and 0.150 inches |
| Head Style | Pan no. 2 |
| Internal Drive Style | Offset cruciform (torque set) |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Specification Data | 80205-nas1578 professional/industrial association standard |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty2 cl2 federal specification single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.378 inches and 0.428 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS1578A4T6
- NAS1578A4T9
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1578A4T6. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error