The Bolt,machine, cataloged under National Stock Number 5306-00-522-6256, 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15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-522-6256 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES OVERALL |
| Head Height | 0.125 INCHES NOMINAL IN |
| Fastener Length | 1.875 INCHES NOMINAL IN |
| Thread Length | 0.391 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | QQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.462 INCHES NOMINAL IN |
| Width Between Flats | 0.375 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 1137 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 687585 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-522-6256 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-522-6256: Surface Finish: 125.0 MICROINCHES OVERALL; Head Height: 0.125 INCHES NOMINAL IN; Fastener Length: 1.875 INCHES NOMINAL IN; Thread Length: 0.391 INCHES MINIMUM AND 0.436 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.