The Bolt,internal Wrenching, cataloged under National Stock Number 5306-00-285-1257, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-285-1257 |
| Item Name | Bolt,internal Wrenching |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Width Across Flats | 0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN |
| Head Height | 0.226 INCHES NOMINAL IN |
| Fastener Length | 1.423 INCHES MINIMUM AND 1.453 INCHES MAXIMUM IN |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-5000 COND A/A MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 COND A/A MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-8503 COND A/A MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | BEVEL-CONICAL |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4340 OR STEEL COMP 8740 OR STEEL COMP 6150 OR STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.430 INCHES MINIMUM AND 0.438 INCHES MAXIMUM 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 |
|---|---|
| 144-23 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-285-1257 is a Bolt,internal Wrenching, classified under FSC 5306, Bolts. Status: active.
5 possible matches (shared part number, not a government interchangeability claim): 4910-00-368-2908, 4320-00-369-3638, 3040-01-182-3493. Verify interchangeability with system specifications before substitution.
Key specifications for 5306-00-285-1257: Width Across Flats: 0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN; Head Height: 0.226 INCHES NOMINAL IN; Fastener Length: 1.423 INCHES MINIMUM AND 1.453 INCHES MAXIMUM IN; Thread Length: 0.500 INCHES NOMINAL IN. 16 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.