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NAS517-5-2
Close Tolerance Flat Head Screw - 100 Degree
Description
Fastener Length: 43/64", Thread: 1/4-24, Thread Length: 1/2"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 0.641 inches minimum and 0.686 inches maximum |
| Finish | Cadmium per QQ-P-416 Type II Class 2 |
| Grip | .125 |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 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 | .656 Inch, 43/64 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp 4037 or steel comp 8630 |
| Screw Material Specification | Ams 6300 assn std 1st material response or mil-s-6050 mil spec 2nd material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-b-416,ty 2,cl 3 fed spec all treatment responses |
| Size | 5/16-24 |
| Specification Data | 80205-nas517 professional/industrial association standard |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.531 inches minimum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS517-5-2. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error