screws › close tolerance screws
NAS1578A4T9
Close Tolerance Screw
Description
Flat Pan Head Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Fastener Length | 0.950 inches minimum and 0.980 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 0.552 inches minimum and 0.572 inches maximum |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Diameter | 0.477 inches minimum and 0.492 inches maximum |
| Head Height | 0.140 inches minimum and 0.150 inches maximum |
| Head Style | Pan no. 2 |
| Internal Drive Style | Offset cruciform (torque set) |
| Length | 31/32 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| NIIN | 01-058-7072 |
| NSN | 5305-01-058-7072 |
| Specification Data | 80205-nas1578 professional/industrial association standard |
| Surface Finish | 32.0 microinches bearing surface of head, 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty2 cl2 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.378 inches minimum and 0.428 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
| Weight | 0.02 lb |
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 NAS1578A4T9. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error