The Bolt,machine, cataloged under National Stock Number 5306-00-025-3749, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-025-3749 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES THREADS |
| Head Height | 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | ASTM B633,TY 2,SC 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.240 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | HEXAGON FLATS |
| Material Document and Classification | SAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 2 TYPE AND 10P STYLE |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 24 |
| Hole Quantity | 1 |
| 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 |
| Reference | Meaning |
|---|---|
| B1821BH031F038D | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-025-3749 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-025-3749: Surface Finish: 63.0 MICROINCHES THREADS; Head Height: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN; Surface Treatment Document and Classification: ASTM B633,TY 2,SC 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.240 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN. 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.