bolts › close tolerance bolts
BACB30LU4D9
Bolt
Description
Fastener Length: 0-63/64", Thread: 1/4-28, Thread Length: 7/16"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Distance From Head Largest Bearing Surface To Shank Hole Center | 0.809 inches nominal first hole |
| Fastener Length | 0.972 inches minimum and 1.002 inches maximum |
| Grip Diameter | 0.2485 inches minimum and 0.2495 inches maximum |
| Grip Length | 0.552 inches minimum and 0.572 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 | 0 63/64 |
| Material | Steel |
| Material Specification | Mil-s-5000 mil spec 1st material response or mil-s-6049 mil spec 2nd material response or ams 6322 assn std 2nd material response |
| Shank Unthreaded Hole Diameter | 0.076 inches minimum first hole and 0.086 inches maximum first hole |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 ty 2 cl 2 fed spec single treatment response |
| 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
No interchangeable or dimensionally similar parts are on record for BACB30LU4D9. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error