The Bolt,square Neck, cataloged under National Stock Number 5306-00-012-0231, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company. Government technical data includes 17 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through both NSN and commercial part number lookups. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5306-00-012-0231 |
| Primary Part Number | 21260 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Fastenal Company |
| Status | CANCELLED |
| 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 | 1.719 INCHES MINIMUM AND 1.781 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | ASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.875 INCHES MINIMUM IN |
| Material Document and Classification | SAE GR 1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Surface Treatment | ZINC OVERALL |
| Minimum Tensile Strength | 55000 POUNDS PER SQUARE INCH LBS |
| 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 | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 21260 PRIMARY | Fastenal Company (USA) |
| Reference | Meaning |
|---|---|
| 120231 | 5/9 Secondary reference Diamond Reo Truck Co |
| NASM35751 | 5/9 Secondary reference Aerospace Industries Association of America Inc |
| 5306000120231 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 2349867 | 5/9 Secondary reference Ford Motor Co Ford Parts and Service Div Government Part Sales |
| 120231 | 5/1 Secondary reference Chrysler Realty Company Llc Dba Daimler Chrysler |
| FF-B-584 | 5/9 Secondary reference U.S. Government activity |
| MS35751-44 | 5/9 Secondary reference U.S. Government activity |
| FF-B-584 TY1CL1STAGRA | 5/9 Secondary reference U.S. Government activity |
| 120231 | 5/1 Secondary reference Army Weapons Command Attn Amswe-Ree-S |
| 120231 | 5/1 Secondary reference General Motors Corp |
| ASME B18.5 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
| 5305PL0827562 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5306-00-012-0231 is a Bolt,square Neck, manufactured by Fastenal Company, classified under FSC 5306, Bolts. Status: cancelled.
NSN 5306-00-012-0231 has 1 manufacturer part number on file: 21260 (Fastenal Company).
Key specifications for 21260: 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: 1.719 INCHES MINIMUM AND 1.781 INCHES MAXIMUM IN; Surface Treatment Document and Classification: ASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 17 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.
NSN 5306-00-012-0231 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.