screws › machine screws
NAS1801-4-25
Machine Screw
Description
Fastener Length: 1-37/64", Thread: 1/4-28, Thread Length: 1-35/64
Specifications
| Fastener Length | Between 1.546 inches and 1.593 inches |
|---|---|
| Head Height | Between 0.125 inches and 0.140 inches |
| Head Style | Hexagon Head |
| Internal Drive Style | Cross recess type 1 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp |
| Screw Material Specification | Mil-s-5000 military specification 1st material response or mil-s-6049 military specification 2nd material response or ams 6322 assn standard 2nd material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Class 2 federal specification single treatment response type 2 qq-p-416 |
| Specification Data | 80205-nas1801 professional/industrial association standard |
| Thread Class | 3a |
| Thread Diameter | 0.25 |
| Thread Direction | Right-hand |
| Thread Length | Between 1.482 inches and 1.561 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
| Width Between Flats | Between 0.367 inches and 0.376 inches |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1801-4-25. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error