screws › close tolerance screws
BACB30LU4-3
Close Tolerance Screw
Description
Fastener Length: 5/8", Thread: 1/4-28, Thread Length: 7/16
Specifications
| Countersink Angle | 100.0 degrees |
|---|---|
| Fastener Length | Between 0.598 inches and 0.628 inches |
| Grip Diameter | Between 0.2485 inches and 0.2495 inches |
| Grip Length | Between 0.178 inches and 0.198 inches |
| Head Diameter | Between 0.455 inches and 0.510 inches |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 5/8 |
| Material | Steel |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Cl 3 federal specification single treatment response type 2 qq-p-416 |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | Between 0.400 inches and 0.450 inches |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Series Designator | Unjf (fine thread with external controlled root radius) |
| Thread Size | 1/4 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- BACB30LU4-3
- BACB30LU4-4
- BACB30LU4-48
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.
- NAS7104-3 NAS 1/4-28 · 5/8 in · Flat countersunk · Steel
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error