The Bolt,machine, cataloged under National Stock Number 5306-01-646-2412, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-646-2412 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.203 INCHES NOMINAL IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Thread Length | 1.219 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | CROWNED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.563 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 4140 OR STEEL COMP 4037 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 |
|---|---|
| NAS428K6A12 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-646-2412 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-646-2412: Head Height: 0.203 INCHES NOMINAL IN; Fastener Length: 1.250 INCHES NOMINAL IN; Thread Length: 1.219 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN. 13 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.