The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-673-7244, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-673-7244 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 4.528 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS 27000,TYPE 2 OR TYPE 8,CLASS 4 NATIONAL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.528 INCHES NOMINAL IN |
| Material Document and Classification | NAS6308 NATIONAL STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.488 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.167 INCHES NOMINAL IN |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Grip Diameter | 4.00 INCHES NOMINAL IN |
| Nonstandard Thread Pitch Diameter | -0.150 TO 0.250 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.111 INCHES NOMINAL IN |
| 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 |
|---|---|
| NAS6308U64DH | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-673-7244 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-673-7244: Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 4.528 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS 27000,TYPE 2 OR TYPE 8,CLASS 4 NATIONAL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.528 INCHES NOMINAL IN. 20 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.