screws › socket head cap screws
MS16998-40
3/8 Inch Length MS16998 Undrilled Socket Head Screw
Description
Fastener Length: 3/8", Thread: 1/4-28, Head Width: 3/16", Thread Length: 3/8", MS16998 series screw
Specifications
| Alternate Part Number | NAS1315-4-6P |
|---|---|
| Country of Origin | USA |
| Drilling | Undrilled Head |
| Drive Style | Hexagon |
| Fastener Length | Between 0.344 inches and 0.375 inches |
| Finish | Cadmium ll |
| Hardness Rating | 36.0 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 | MS16998 |
| Internal Drive Style | Hexagon |
| Length | 3/8 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Minimum Yield Strength | 130000 pounds per square inch |
| Nondefinitive Specification/Std Data | 6 type |
| Size | 1/4-28 |
| Sold In | Per Package |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 type 2 cl 3 federal specification single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.273 inches and 0.375 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 0.2500-28, 1/4 |
| Thread Type | N.F. - Fine |
| Weight | .005 lb |
| Width Across Flats | Between 0.187 inches and 0.190 inches |
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.
- NAS1351-4-6P NAS 28.00-28 · 3/8 in · Flat chamfer · Steel
- NAS1351C4-6 NAS 28.00-28 · 3/8 in · Flat chamfer · CRES
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error