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NAS1351-4-6P
MS16998-40 Socket Head Cap Screw
Description
Socket Head Screw
Specifications
| Country of Origin | USA |
|---|---|
| Drilling | Undrilled Head |
| Drive Style | Hexagon |
| Fastener Length | Between 0.345 inches and 0.375 inches |
| Hardness Rating | 38.0 rockwell c and 45.0 rockwell c |
| Head Diameter | Between 0.365 inches and 0.375 inches |
| Head Height | Between 0.244 inches and 0.250 inches |
| Head Style | Flat chamfer |
| Head Type | Socket |
| Industry Standards/Certification | NAS1351 |
| Internal Drive Style | Hexagon |
| Length | .38, 3/8 in |
| Material | Steel |
| Min. Tensile Strength (psi) | 170000 pounds per square inch |
| Minimum Yield Strength | 150000 pounds per square inch |
| NIIN | 01-076-7204 |
| NSN | 5305-01-076-7204 |
| Sold In | EA |
| Specification Data | 80205-nas1351 professional/industrial association standard |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 type 2 cl 2 federal specification single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Fraction | 1/4-28 |
| Thread Length | Between 0.274 inches and 0.375 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNRF |
| Thread Series Designator | UNRF |
| Thread Size | 0.2500-28, 1/4 |
| Weight | 0.01 lb |
| Width Across Flats | Between 0.188 inches and 0.190 inches |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- MS16998-40 MS 28.00-28 · 3/8 in · Flat chamfer · Steel
- NAS1351C4-6 NAS 28.00-28 · 3/8 in · Flat chamfer · CRES
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Catalog data updated 2026-07-05. Report a data error