The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-491-4286, 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14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-491-4286 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN |
| Fastener Length | 1.512 INCHES MINIMUM AND 1.542 INCHES MAXIMUM IN |
| Thread Length | 0.902 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE AND AMS6415 ASSN STD 2ND MATERIAL RESPONSE AND MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | DISHED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Width Between Flats | 0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN |
| Grip Diameter | 0.6190 INCHES MINIMUM AND 0.6195 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 4140 AND STEEL COMP 4340 AND STEEL COMP 8740 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 |
|---|---|
| NAS6610-10 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-491-4286 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-491-4286: Head Height: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN; Fastener Length: 1.512 INCHES MINIMUM AND 1.542 INCHES MAXIMUM IN; Thread Length: 0.902 INCHES NOMINAL IN; Material Document and Classification: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE AND AMS6415 ASSN STD 2ND MATERIAL RESPONSE AND MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL. 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.