screws › hexagon head cap screws
B1821AH031C125N
Screw
Description
Fastener Length: 1-1/4", Thread: 1/4-18, Thread Length: 7/8"
Specifications
| Fastener Length | 1.250 |
|---|---|
| Features Provided | Finished head |
| Head Height | 0.195 inches minimum and 0.211 inches maximum |
| Head Style | Hexagon Head |
| Length | 1 1/4 |
| Material | Steel |
| Material Specification | Sae j429 gr8 assn std 1st material response or astm a354 assn std 2nd material response |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty2 cl3 fed spec single treatment response |
| Thread Class | 2a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.875 |
| 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.
- B1821AH031C075N
- B1821AH031C088N
- B1821AH031C100N
- B1821AH031C125N
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.
- MS90725-37 MS 1/4-18 · 0.073 in · Hexagon Head · Steel
- MS90725-38 MS 1/4-18 · 0.073 in · Hexagon Head · Steel
- B1821AH031C100N Other 1/4-18 · 0.073 in · Hexagon Head · Steel
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Catalog data updated 2026-07-05. Report a data error