screws › hexagon head cap screws
B1821BH031C350L
Screw
Description
Fastener Length: 3-1/2", Thread: 1/4-18, Thread Length: 7/8"
Specifications
| Fastener Length | 3.406 inches minimum and 3.500 inches maximum |
|---|---|
| Features Provided | Finished head |
| Hardness Rating | 32.0 rockwell c minimum fastener and 38.0 rockwell c maximum fastener |
| Head Height | 0.195 inches minimum and 0.211 inches maximum |
| Head Style | Hexagon Head |
| Length | 3 1/2 |
| Locking Feature | Patch threads or strip threads |
| Material | Plastic |
| Material Specification | Sae j429,grade 8 assn std single material response fastener or astm a354,grade bd assn std single material response fastener |
| Min. Tensile Strength (psi) | 150000 pounds per square inch |
| Surface Treatment | Zinc and chromate |
| Surface Treatment Specification | Astm b633 ty 2 sc 3 assn std single treatment response fastener |
| Thread Class | 2a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.875 inches minimum |
| Thread Qty | 18 |
| Thread Qty Per Inch (tpi) | 18 |
| Thread Series Designator | UNC |
| Thread Size | 1/4 |
| Width Between Flats | 0.489 inches minimum and 0.500 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for B1821BH031C350L. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error