screws › socket head cap screws
NAS1351N5-40
Socket Head Cap Screw
Description
Fastener Length: 2-1/2", Thread: 1/4-24, Head Width: 1/4", Thread Length: 1-1/8
Specifications
| Fastener Length | 2.460 inches minimum and 2.500 inches maximum |
|---|---|
| Hardness Rating | 33.0 rockwell c minimum and 42.0 rockwell c maximum |
| Head Diameter | 0.457 inches minimum and 0.469 inches maximum |
| Head Height | 0.306 inches minimum and 0.312 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Hexagon |
| Length | 2 1/2 |
| Material | Iron |
| Material Specification | Ams5731 assn std single material response and ams5737 assn std single material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Specification Data | 80205-nas1531 professional/industrial association standard |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 1.125 inches minimum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNRF |
| Thread Size | 1/4 |
| Width Across Flats | 0.250 inches minimum and 0.253 inches maximum |
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.
- NAS1351-5-36 NAS 1/4-24 · 0.086 in · Flat chamfer · Steel
- NAS1351-5-36P NAS 1/4-24 · 0.086 in · Flat chamfer · Steel
- NAS1351C5-36 NAS 1/4-24 · 0.086 in · Flat chamfer · CRES
- NAS1351C5-40 NAS 1/4-24 · 0.086 in · Flat chamfer · CRES
- NAS1351N5-36 NAS 1/4-24 · 0.086 in · Flat chamfer · Iron
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error