screws › machine screws
91400A859
Screw
Description
Fastener Length: 1-1/4", Thread: 1/4-28, Thread Length: 1-3/16"
Specifications
| Fastener Length | 1.250 |
|---|---|
| Head Diameter | 0.473 inches minimum and 0.492 inches maximum |
| Head Height | 0.162 inches minimum and 0.175 inches maximum |
| Head Style | Pan Head |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 1/4 |
| Material | Steel |
| Min. Tensile Strength (psi) | 80000 pounds per square inch |
| Screw Material | Steel comp 302 or steel comp 303 or steel comp 304 or steel comp 305 or steel comp 316 |
| Screw Material Specification | 66 fed std all material responses |
| Screw Surface Treatment | Passivate |
| Screw Surface Treatment Specification | Qq-p-35 fed spec single treatment response |
| Thread Class | 2a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 1.179 inches minimum and 1.250 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
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.
- NAS1100-4-20 NAS 1/4-28 · 0.073 in · Pan Head · Steel
- NAS604-20 NAS 1/4-28 · 0.073 in · Pan Head · Steel
- NAS604-20P NAS 1/4-28 · 0.073 in · Pan Head · Steel
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Catalog data updated 2026-07-05. Report a data error