screws › socket head cap screws
NAS1351N4H20
Socket Head Cap Screw
Description
Fastener Length: 1-1/4", Hole Diameter: 3/64", Thread: 1/4-28, Head Width: 3/16", Thread Length: 1", drilled head, NAS1351 series screw
Specifications
| Fastener Length | 1.210 inches minimum and 1.250 inches maximum |
|---|---|
| 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 |
| Hole Configuration Style | Round internal hexagon |
| Hole Diameter | 0.044 inches minimum and 0.050 inches maximum |
| Hole Quantity | 2 |
| Hole Type | Drilled |
| Internal Drive Style | Hexagon |
| Length | 1 1/4 |
| Material | Iron |
| Material Specification | Ams 5731 assn std single material response or ams 5737 assn std single material response |
| Min. Tensile Strength (psi) | 160000 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 | 0.188 inches minimum and 0.190 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.
- 655-590-9122 Commercial 1/4-28 · 0.073 in · Flat chamfer · Iron
- MS24673-13 MS 1/4-28 · 0.073 in · Flat chamfer · CRES
- MS24673-14 MS 1/4-28 · 0.073 in · Flat chamfer · CRES
- NAS1351-4H24P NAS 1/4-28 · 0.073 in · Flat chamfer · Steel
- NAS1351C4H24 NAS 1/4-28 · 0.073 in · Flat chamfer · CRES
- NAS1351C4H28 NAS 1/4-28 · 0.073 in · Flat chamfer · CRES
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Catalog data updated 2026-07-05. Report a data error