The Bolt,machine, cataloged under National Stock Number 5306-00-323-5221, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rolls-Royce Corporation. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-323-5221 |
| Primary Part Number | 6712666 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rolls-Royce Corporation |
| Status | ACTIVE |
| Head Height | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Fastener Length | 6.313 INCHES NOMINAL IN |
| Thread Length | 0.625 INCHES MINIMUM IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | HEXAGON LONGITUDINAL HOLE |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 5.687 INCHES NOMINAL IN |
| Width Between Flats | 0.493 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Hole Quantity | 6 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.062 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 |
NSN 5306-00-323-5221 is a Bolt,machine, manufactured by Rolls-Royce Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-323-5221 has 2 manufacturer part numbers on file: 6712666 (General Motors Corp), 6712666 (Rolls-Royce Corporation).
Key specifications for 6712666: Head Height: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Fastener Length: 6.313 INCHES NOMINAL IN; Thread Length: 0.625 INCHES MINIMUM IN; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL. 18 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.