The Bolt,square Neck, cataloged under National Stock Number 5306-01-652-8127, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-652-8127 |
| Primary Part Number | 4039525 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Neck Length | 0.188 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN |
| Head Height | 0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN |
| Fastener Length | 1.050 INCHES NOMINAL IN |
| Thread Length | 0.900 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.380 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Color | YELLOW OVERALL |
| Surface Treatment | ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.782 INCHES MINIMUM AND 0.844 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 |
|---|---|
| 4039525 PRIMARY | Oshkosh Defense Llc (USA) |
NSN 5306-01-652-8127 is a Bolt,square Neck, manufactured by Oshkosh Defense Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-652-8127 has 1 manufacturer part number on file: 4039525 (Oshkosh Defense Llc).
Key specifications for 4039525: Neck Length: 0.188 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN; Head Height: 0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN; Fastener Length: 1.050 INCHES NOMINAL IN; Thread Length: 0.900 INCHES NOMINAL 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.