screws › close tolerance screws
BACB30LK4-12
Screw
Description
Fastener Length: 1-9/64", Thread: 1/4-28, Thread Length: 3/8"
Specifications
| Fastener Length | 1.124 inches minimum and 1.154 inches maximum |
|---|---|
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 0.740 inches minimum and 0.760 inches maximum |
| Head Diameter | 0.473 inches minimum and 0.492 inches maximum |
| Head Height | 0.162 inches minimum and 0.175 inches maximum |
| Head Style | Pan Head |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 9/64 |
| Material | Iron |
| Material Specification | Ams 5737 assn std single material response |
| Min. Tensile Strength (psi) | 95000 pounds per square inch |
| Surface Finish | 32.0 microinches bearing surface of head32.0 microinches grip32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 2 fed spec all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.389 |
| 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.
- BACB30LK4-6
- BACB30LK4-9
- BACB30LK4-12
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.
- NAS7704-12 NAS 1/4-28 · 0.073 in · Pan Head · Steel
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Catalog data updated 2026-07-05. Report a data error