screws › machine screws
LL57U40J4
Screw
Description
Fastener Length: 1/4", Thread: 4-40, Head Width: 5/64", Thread Length: 1/4"
Specifications
| Fastener Length | 0.250 |
|---|---|
| Head Diameter | 0.178 inches minimum and 0.183 inches maximum |
| Head Height | 0.109 inches minimum and 0.112 inches maximum |
| Head Style | Flat chamfer |
| Internal Drive Style | Hexagon |
| Length | 1/4 |
| Locking Feature | Strip threads |
| Material | Steel |
| Material Specification | Qq-s-763 fed spec single material response |
| Surface Treatment | Passivate |
| Thread Class | 3a |
| Thread Diameter | 0.112 |
| Thread Direction | Right-hand |
| Thread Length | 0.250 inches minimum |
| Thread Qty | 40 |
| Thread Qty Per Inch (tpi) | 40 |
| Thread Series Designator | UNC |
| Thread Size | 4 |
| Width Across Flats | 0.078 inches minimum and 0.079 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- LL57U40J3
- LL57U40J4
Cross-reference
No interchangeable or dimensionally similar parts are on record for LL57U40J4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error