The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-661-8389, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-661-8389 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.400 INCHES NOMINAL IN |
| Fastener Length | 5.173 INCHES NOMINAL IN |
| Thread Length | 0.673 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.7500 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 4.500 INCHES NOMINAL IN |
| Width Between Flats | 1.052 INCHES MINIMUM AND 1.064 INCHES MAXIMUM IN |
| Grip Diameter | 0.7485 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Reference Number Differentiating Characteristics | ITEM IS FAA CERTIFIED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| BACB30LT12U72 | 5/1 Secondary reference Federal Manufacturing Corp |
| BACB30LT12U72 | 5/1 Secondary reference Howmet Global Fastening Systems Inc Div City of Industry Operations |
| BACB30LT12U72 | 5/1 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| BACB30LT12U72 | 3/1 Design control — primary reference U.S. Government activity |
| BACB30LT12U72 | 5/1 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5306-01-661-8389 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-661-8389: Head Height: 0.400 INCHES NOMINAL IN; Fastener Length: 5.173 INCHES NOMINAL IN; Thread Length: 0.673 INCHES NOMINAL IN; Nominal Thread Diameter: 0.7500 INCHES IN. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.