screws › machine screws
LL500-4-4
Screw
Description
Fastener Length: 1/4", Thread: 4-40, Thread Length: 1/4"
Specifications
| Fastener Length | 0.219 inches minimum and 0.250 inches maximum |
|---|---|
| Head Diameter | 0.166 inches minimum and 0.183 inches maximum |
| Head Height | 0.072 inches minimum and 0.079 inches maximum |
| Head Style | Fillister |
| Internal Drive Style | Cross recess type 1 |
| Length | 1/4 |
| Material | Steel |
| Min. Tensile Strength (psi) | 60000 pounds per square inch |
| Part Name Assigned By Controlling Agency | Screw, machine, fillister head, coarse thread |
| Screw Material | Steel or steel comp 1010 |
| Screw Material Specification | Qq-s-630 fed spec 2nd material response or qq-s-631 fed spec 2nd material response or qq-s-634 fed spec 2nd material response |
| Screw Surface Treatment | Cadmium |
| Screw Surface Treatment Specification | Qq-p-416,ty 1,cl 3 fed spec single treatment response |
| Special Features | With self-locking element |
| Thread Class | 2a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | 0.200 inches minimum and 0.250 inches maximum |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series Designator | UNC |
| Thread Size | 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.
- LL54N40S4 Other #4-40 · 1/4 in · Fillister · CRES
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Catalog data updated 2026-07-05. Report a data error