The Bolt,square Neck, cataloged under National Stock Number 5306-00-012-8412, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-012-8412 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Neck Length | 0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN |
| Head Height | 0.156 INCHES NOMINAL IN |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Thread Length | 0.406 INCHES MINIMUM IN |
| Material Document and Classification | QQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | OVAL |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.000 INCHES NOMINAL 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 |
|---|---|
| 128412 | 3/9 Design control — primary reference General Motors Corp |
| 128412 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 5306-00-012-8412 is a Bolt,square Neck, classified under FSC 5306, Bolts. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 6685-00-960-4879, 5331-01-117-0604. Verify interchangeability with system specifications before substitution.
Key specifications for 5306-00-012-8412: Neck Length: 0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN; Head Height: 0.156 INCHES NOMINAL IN; Fastener Length: 0.750 INCHES NOMINAL IN; Thread Length: 0.406 INCHES MINIMUM IN. 15 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.