screws › hexagon head cap screws
B1821BH025C250N
Screw
Description
Fastener Length: 2-1/2", Thread: 1/4-20, Thread Length: 15/16"
Specifications
| Fastener Length | 2.406 inches minimum and 2.500 inches maximum |
|---|---|
| Hardness Rating | 32.0 rockwell c minimum and 38.0 rockwell c maximum |
| Head Height | 0.150 inches minimum and 0.163 inches maximum |
| Head Style | Hexagon Head |
| Length | 2 1/2 |
| Material | Steel |
| Material Specification | Saej429 grade 8 assn std single material response or stma354 grade bd assn std single material response |
| Min. Tensile Strength (psi) | 150000 pounds per square inch |
| Surface Finish | 63.0 microinches threads |
| Surface Treatment | Zinc and chromate |
| Surface Treatment Specification | Qq-p-416,ty2cl3 fed spec single treatment response |
| Thread Class | 2a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.750 inches minimum and 0.938 inches maximum |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series Designator | UNC |
| Thread Size | 1/4 |
| Width Between Flats | 0.428 inches minimum and 0.438 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.
- MS90725-14 MS 1/4-20 · 0.086 in · Hexagon Head · Steel
- MS90728-17 MS 1/4-20 · 0.086 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error