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BACB30LR4U21
Bolt
Description
Fastener Length: 1-3/4", Thread: 1/4-28, Thread Length: 7/16"
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | 1.722 inches minimum and 1.752 inches maximum |
| Grip Diameter | 0.2490 inches minimum and 0.2495 inches maximum |
| Grip Length | 1.302 inches minimum and 1.322 inches maximum |
| Head Diameter | 0.455 inches minimum and 0.510 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 3/4 |
| Material | Iron |
| Surface Treatment | Passivate |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.400 inches minimum and 0.450 inches maximum |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
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.
- BACB30LR4-21 BAC 1/4-28 · 0.073 in · Flat countersunk · Iron
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Catalog data updated 2026-07-05. Report a data error