screws › socket head cap screws
NAS1351C4-40
Socket Head Cap Screw
Description
Fastener Length: 2-1/2", Thread: 1/4-28, Head Width: 3/16", Thread Length: 1", NAS1351 series screw
Specifications
| Fastener Length | 2.460 inches minimum and 2.500 inches maximum |
|---|---|
| Hardness Rating | 80.0 rockwell b minimum |
| Head Diameter | 0.365 inches minimum and 0.375 inches maximum |
| Head Height | 0.244 inches minimum and 0.250 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Hexagon |
| Length | 2 1/2 |
| Material | CRES |
| Material Specification | 66 fed std 1st material response or 66 fed std 2nd material response or 66 fed std 3rd material response or 66 fed std 4th material response or 66 fed std 5th material response or astm a493 assn std 6th material response |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Minimum Yield Strength | 30000 pounds per square inch |
| Specification Data | 80205-nas1351 professional/industrial association standard |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 1.000 inches minimum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNRF |
| Thread Size | 1/4 |
| Width Across Flats | 0.1875 inches minimum and 0.1900 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.
- NAS1351-4-36P NAS 1/4-28 · 0.086 in · Flat chamfer · Steel
- NAS1351-4-48 NAS 1/4-28 · 0.086 in · Flat chamfer · Steel
- NAS1351C4-32 NAS 1/4-28 · 0.086 in · Flat chamfer · Steel
- NAS1351C4-36 NAS 1/4-28 · 0.086 in · Flat chamfer · CRES
- NAS1351N4LL36 NAS 1/4-28 · 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