The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-478-6437, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-478-6437 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.480 INCHES MINIMUM IN |
| Fastener Length | 1.215 INCHES MINIMUM AND 1.235 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE2,CLASS2 FED SPEC 1ST TREATMENT RESPONSE OVERALL |
| Thread Length | 0.425 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5731,AMS5732,AMS5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS5353 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Grip Length | 0.790 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN |
| Width Between Flats | 0.429 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| NAS6703-6720-6 | 5/2 Secondary reference U.S. Government activity |
| NAS6704-6 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-478-6437 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-478-6437: Head Height: 0.480 INCHES MINIMUM IN; Fastener Length: 1.215 INCHES MINIMUM AND 1.235 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TYPE2,CLASS2 FED SPEC 1ST TREATMENT RESPONSE OVERALL; Thread Length: 0.425 INCHES MAXIMUM IN. 15 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.