screws › machine screws
NAS517-4-8
100°; Flush Head Screw
Description
NAS 517-4-8 Close Tolerance Flat Head Screw - 100 Degree
Specifications
| Countersink Angle | Between 99 degrees and 101 degrees |
|---|---|
| Country of Origin | USA |
| Drive Style | Cross |
| Fastener Length | Between 0.954 inches and 0.999 inches |
| Finish | Cadmium per QQ-P-416 Type II Class 2 |
| Grip | 0.500 in |
| Hardness Rating | Between 36.0 rockwell c and 40 rockwell c |
| Head Angle | 100 º |
| Head Diameter | Between 0.452 inches and 0.51 inches |
| Head Style | Flat Head, Flat countersunk |
| Head Type | Flat |
| Industry Standards/Certification | NAS517 |
| Internal Drive Style | Cross recess type 1 |
| Length | .969 Inch, 0.969 in |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| NIIN | 00-207-3738 |
| NSN | 5305-00-207-3738 |
| Screw Material | Steel |
| Screw Material Specification | Mil-s-6050 military specification single material response or an-s-9 military standard single material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416 type 2 class 2 federal specification single treatment response |
| Size | 1/4-28 |
| Sold In | Per Package |
| Thread Class | 3a |
| Thread Diameter | 0.25 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.368 inches and 0.514 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 0.2500-28, 1/4 |
| Weight | 0.015 lb |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS517-4-8. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error