bolts › close tolerance bolts
BACB30LU4-12
Bolt
Description
Fastener Length: 1-3/16", Thread: 1/4-28, Thread Length: 27/64"
Specifications
| Countersink Angle | 99.0 degrees minimum and 101.0 degrees maximum |
|---|---|
| Fastener Length | 1.160 inches minimum and 1.190 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 | 0.455 inches minimum and 0.510 inches maximum |
| Head Style | Flat countersunk |
| Internal Drive Style | Cross recess type 1 |
| Length | 1 3/16 |
| 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 |
| Surface Finish | 32.0 microinches grip, 32.0 microinches threads |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 type 2 class 2 fed spec single treatment response |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.425 |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series Designator | UNJF |
| Thread Size | 1/4 |
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.
- NAS1580A4T12 NAS 1/4-28 · 0.073 in · Flat countersunk · Steel
- NAS1580C4R12 NAS 1/4-28 · 0.073 in · Flat countersunk · Iron
- NAS1580V4T12 NAS 1/4-28 · 0.073 in · Flat countersunk · Titanium
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Catalog data updated 2026-07-05. Report a data error