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NAS517-8-6
Close Tolerance Flat Head Screw - 100 Degree
Description
Fastener Length: 1-9/64", Thread: 1/2-20, Thread Length: 25/32"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.1 degrees maximum |
|---|---|
| Departure From Cited Designator | As modified by special features |
| Fastener Length | 1.110 inches minimum and 1.155 inches maximum |
| Finish | Cadmium per QQ-P-416 Type II Class 2 |
| Grip | .375 |
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| Head Diameter | 0.881 inches minimum and 0.882 inches maximum |
| Head Style | Flat Head, Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 9/64, 1.125 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp e4340 or steel comp 4340 or steel comp 8740 or steel comp 8735 or steel comp 4140 |
| Screw Material Specification | Mil-s-5000 mil spec 1st material response or mil-s-5000 mil spec 2nd material response or mil-s-6049 mil spec 3rd material response or mil-s-6098 mil spec 4th material response or mil-s-5626 mil spec 5th 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 | 1/2-20 |
| Special Features | Fleet ballistic missile quality as identified by quality control no.poso909472 |
| Specification Data | 80205-nas517 professional/industrial association standard |
| Thread Class | 3a |
| Thread Diameter | 0.500 |
| Thread Direction | Right-hand |
| Thread Length | 0.620 inches minimum and 0.795 inches maximum |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNF |
| Thread Size | 1/2 |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error