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NAS1801-04-4
0.250 Inch Length NAS1801 Hexagon Head Machine Screw
Description
0.250 Inch Length NAS1801 Hexagon Head Machine Screw
Specifications
| Bolt Head Shape | Hexagon |
|---|---|
| Country of Origin | USA |
| Drive Style | Cross |
| Fastener Length | Between 0.234 inches and 0.281 inches |
| Hardness Rating | Between 36.0 rockwell c and 40.0 rockwell c |
| Head Height | Between 0.049 inches and 0.060 inches |
| Head Style | Hexagon Head |
| Head Type | Cruciform Recess |
| Industry Standards/Certification | NAS1801 |
| Internal Drive Style | Cross recess type 1 |
| Length | 0.250 in |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp e4340 or steel comp 8740 |
| Screw Material Specification | Mil-s-5000 military specification 1st material response or mil-s-6049 military specification 2nd material response or ams6322 assn standard 2nd material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Type 2 class 2 federal specification all treatment responses qq-p-416 |
| Sold In | EA |
| Specification Data | 80205-nas1801 professional/industrial association standard |
| Thread Class | 3a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.120 inches and 0.249 inches |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series | UNJC |
| Thread Series Designator | UNJC |
| Thread Size | 4-40 |
| Thread Type | Full Thread |
| Weight | .005 lb |
| Width Between Flats | Between 0.181 inches and 0.189 inches |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
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- MS51849-11 MS #4-40 · 1/4 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error