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NAS1801-4-17
Machine Screw
Description
Fastener Length: 1-5/64", Thread: 1/4-28, Thread Length: 0-63/64
Specifications
| Fastener Length | Between 1.046 inches and 1.093 inches |
|---|---|
| Head Height | Between 0.125 inches and 0.140 inches |
| Head Style | Dished hexagon |
| Internal Drive Style | Cross recess type 1 |
| Material | Steel |
| Material Specification | Mil-s-5000 military specification 1st material response or mil-s-6049 military specification 1st material response or ams 6322 assn standard 2nd material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Specification Data | 80205-nas1801 professional/industrial association standard |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Type 2 class 2 federal specification single treatment response qq-p-416 |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.975 inches and 1.093 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 |
| Thread Surface Finish | 32.0 microinches |
| Width Between Flats | Between 0.367 inches and 0.376 inches |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1801-4-17. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error