screws › hexagon head cap screws
B1821BH038C125L
Screw
Description
Fastener Length: 1-1/4", Thread: 3/8-16, Thread Length: 1-3/16"
Specifications
| Fastener Length | 1.125 inches minimum and 1.250 inches maximum |
|---|---|
| Features Provided | Finished head |
| Hardness Rating | 32.0 rockwell c minimum fastener and 38.0 rockwell c maximum fastener |
| Head Height | 0.226 inches minimum and 0.243 inches maximum |
| Head Style | Hexagon Head |
| Length | 1 1/4 |
| 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 |
| Minimum Yield Strength | 130000 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 | 0.375 |
| Thread Direction | Right-hand |
| Thread Length | 1.000 inches minimum and 1.188 inches maximum |
| Thread Qty | 16 |
| Thread Qty Per Inch (tpi) | 16 |
| Thread Series Designator | UNC |
| Thread Size | 3/8 |
| Width Between Flats | 0.551 inches minimum and 0.562 inches maximum |
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.
- MS35307-363 MS 3/8-16 · 0.073 in · Hexagon Head · CRES
- MS35307-365 MS 3/8-16 · 0.073 in · Hexagon Head · CRES
- B1821BH038C175N Other 3/8-16 · 0.073 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error