screws › machine screws
NAS517-5-20
Close Tolerance Flat Head Screw - 100 Degree
Description
NAS 517-5-20 Close Tolerance Flat Head Screw - 100 Degree
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 1.766 inches minimum and 1.811 inches maximum |
| Finish | Cadmium per QQ-P-416 Type II Class 2 |
| Grip | 1.250 |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Diameter | 0.572 inches minimum and 0.638 inches maximum |
| Head Style | Flat Head, Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 1.781 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp 8630 |
| Screw Material Specification | Mil-s-6050 mil spec single material response or an-s-9 mil std single material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Size | 5/16-24 |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.418 inches minimum and 0.576 inches maximum |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS517-5-20. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error