The Bolt,machine, cataloged under National Stock Number 5306-00-558-4128, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-558-4128 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.243 INCHES NOMINAL IN |
| Fastener Length | 1.750 INCHES NOMINAL IN |
| Thread Length | 1.000 INCHES MAXIMUM IN |
| Hardness Rating | 95.5 ROCKWELL B NOMINAL OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.750 INCHES NOMINAL IN |
| Width Between Flats | 0.562 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | B-2 TYPE |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Minimum Tensile Strength | 48000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL 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 |
|---|---|
| 60-6-16 | 2/2 Government specification standardization U.S. Government activity |
NSN 5306-00-558-4128 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5950-01-339-7294, 5120-01-487-2346, 6515-01-520-6469. Verify interchangeability with system specifications before substitution.
Key specifications for 5306-00-558-4128: Head Height: 0.243 INCHES NOMINAL IN; Fastener Length: 1.750 INCHES NOMINAL IN; Thread Length: 1.000 INCHES MAXIMUM IN; Hardness Rating: 95.5 ROCKWELL B NOMINAL OVERALL. 17 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.