The Bolt,square Neck, cataloged under National Stock Number 5306-01-491-9986, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-491-9986 |
| Primary Part Number | 12335260-2 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Neck Length | 1.709 INCHES MINIMUM AND 1.759 INCHES MAXIMUM IN |
| Fastener Length | 2.250 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM B633 TYPE 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.250 INCHES MINIMUM IN |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.750 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN |
| Surface Treatment | ZINC OVERALL |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 10 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.250 INCHES MINIMUM AND 1.303 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 |
|---|---|
| 12335260-2 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 5306-01-491-9986 is a Bolt,square Neck, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-491-9986 has 1 manufacturer part number on file: 12335260-2 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12335260-2: Neck Length: 1.709 INCHES MINIMUM AND 1.759 INCHES MAXIMUM IN; Fastener Length: 2.250 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASTM B633 TYPE 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 1.250 INCHES MINIMUM IN. 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.