The Bolt,machine, cataloged under National Stock Number 5306-00-558-8209, 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13 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-558-8209 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.188 INCHES NOMINAL IN |
| Fastener Length | 4.375 INCHES NOMINAL IN |
| Thread Length | 0.500 INCHES MINIMUM IN |
| Material Document and Classification | QQ-N-281,CLASS A FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.562 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| MILB857 | 4/1 Identification reference U.S. Government activity |
NSN 5306-00-558-8209 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-558-8209: Head Height: 0.188 INCHES NOMINAL IN; Fastener Length: 4.375 INCHES NOMINAL IN; Thread Length: 0.500 INCHES MINIMUM IN; Material Document and Classification: QQ-N-281,CLASS A FED SPEC ALL MATERIAL RESPONSES OVERALL. 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.