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NAS623-4-11
Machine Screw
Description
Fastener Length: 0-63/64", Thread: 1/4-28, Thread Length: 21/64
Specifications
| Country of Origin | USA |
|---|---|
| Fastener Length | Between 0.989 inches and 1.019 inches |
| Hardness Rating | Between 36.0 rockwell c and 40.0 rockwell c |
| Head Diameter | Between 0.473 inches and 0.492 inches |
| Head Height | Between 0.162 inches and 0.175 inches |
| Head Style | Pan Head |
| Industry Standards/Certification | NAS1623 |
| Internal Drive Style | Cross recess type 1 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| NIIN | 00-577-5456 |
| NSN | 5305-00-577-5456 |
| Screw Material | Steel comp 4140 or steel comp e4340 or steel comp 8740 |
| Screw Material Specification | Mil-s-5626 military specification 1st material response or mil-s-5000 military specification 2nd material response or mil-s-6049 military specification 3rd material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416 type 2 cl 2 federal specification single treatment response |
| Sold In | Per Package |
| Specification Data | 80205-nas623 professional/industrial association standard |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.291 inches and 0.341 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 |
| Weight | .005 lb |
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS623-4-11. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error