screws › machine screws
NAS1100-4-20
Screw
Description
Fastener Length: 1-1/4", Thread: 1/4-28, Thread Length: 1-1/4"
Specifications
| Fastener Length | 1.250 |
|---|---|
| Hardness Rating | 36.0 rockwell c minimum and 40.0 rockwell c maximum |
| 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 | Torque set |
| Length | 1 1/4 |
| Material | Steel |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| Screw Material | Steel comp e4340 or steel comp 8740 or steel comp 8735 or steel comp 6150 or steel comp 4140 or steel comp 4037 |
| Screw Material Specification | Mil-s-5000 mil spec 1st material response or mil-s-6049 mil spec 2nd material response or mil-s-6098 mil spec 3rd material response or mil-s-8503 mil spec 4th material response or mil-s-5626 mil spec 5th material response or ams 6300 assn std 6th material response |
| Screw Surface Treatment | Cadmium and chromate |
| Screw Surface Treatment Specification | Qq-p-416 ty 2 cl 3 fed spec single treatment response |
| Thread Class | 3a |
| 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 |
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.
- 91400A859 Commercial 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
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error