screws › socket head cap screws
MS16998-46L
Military Standard Socket Head Cap Screw
Description
Fastener Length: 1-1/4", Thread: 1/4-28, Head Width: 3/16", Thread Length: 1-1/4", MS16998 series screw
Specifications
| Drive Style | Hexagon |
|---|---|
| Fastener Length | Between 1.210 inches and 1.250 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 |
| Internal Drive Style | Hexagon |
| Length | 1 1/4 |
| Locking Feature | Patch threads or pellet threads or strip threads |
| Material | Plastic |
| Min. Tensile Strength (psi) | 180000 pounds per square inch |
| Minimum Yield Strength | 155000 pounds per square inch |
| Specification Data | 80205-nas1351 professional/industrial association standard |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Type 2 class 2 federal specification single treatment response fastener qq-p-416 |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 1.139 inches and 1.250 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNRF |
| Thread Series Designator | UNRF |
| Thread Size | 1/4 |
| 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.
- NAS1351-4LE20P NAS 1/4-28 · 0.073 in · Flat chamfer · Plastic
- MS16998-47L MS 1/4-28 · 0.073 in · Flat chamfer · Steel
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Catalog data updated 2026-07-05. Report a data error