The Bolt,square Neck, cataloged under National Stock Number 5306-01-448-6564, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Valley Fastener Group Llc Div Hill Fastener. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-448-6564 |
| Primary Part Number | 3/8-16UNC-2BX3.5 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Valley Fastener Group Llc Div Hill Fastener |
| 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 | 3.440 INCHES MINIMUM AND 3.540 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MS35751 CADMIUM OR ZINC PLATED MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 3.000 INCHES NOMINAL IN |
| Material Document and Classification | MS35751 CARBON STEEL MIL STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | OVAL |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.368 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR 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 |
|---|---|
| 3/8-16UNC-2BX3.5 | Valley Fastener Group Llc Div Hill Fastener (USA) |
| Reference | Meaning |
|---|---|
| 3/8-16UNC-2BX3.5 | 5/9 Secondary reference Assembly Fasteners Inc |
| A3148290-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-448-6564 is a Bolt,square Neck, manufactured by Valley Fastener Group Llc Div Hill Fastener, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-448-6564 has 1 manufacturer part number on file: 3/8-16UNC-2BX3.5 (Valley Fastener Group Llc Div Hill Fastener).
Key specifications for 3/8-16UNC-2BX3.5: 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: 3.440 INCHES MINIMUM AND 3.540 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MS35751 CADMIUM OR ZINC PLATED MIL STD SINGLE TREATMENT RESPONSE OVERALL. 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.