The Bolt,square Neck, cataloged under National Stock Number 5306-01-657-4458, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-657-4458 |
| Primary Part Number | 4159377001 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Neck Length | 0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN |
| Head Height | 0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN |
| Fastener Length | 1.00 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.31 INCHES IN |
| Head Style | OVAL |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Color | BLACK OVERALL |
| Surface Treatment | PHOSPHATE ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.688 INCHES MINIMUM AND 0.719 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 |
| Part Number | Manufacturer |
|---|---|
| 4159377001 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 4159377 | D/9 Drawing number reference only Oshkosh Defense Llc |
NSN 5306-01-657-4458 is a Bolt,square Neck, manufactured by Oshkosh Defense Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-657-4458 has 1 manufacturer part number on file: 4159377001 (Oshkosh Defense Llc).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-0242. Verify interchangeability with system specifications before substitution.
Key specifications for 4159377001: Neck Length: 0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN; Head Height: 0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN; Fastener Length: 1.00 INCHES NOMINAL IN; Nominal Thread Diameter: 0.31 INCHES IN. 14 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.