The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-441-1666, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Reliable Tool & Machine Company, Inc.. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-441-1666 |
| Primary Part Number | STN-506 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Reliable Tool & Machine Company, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.790 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Material Document and Classification | SAE J995 GRADE 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Nut Height | 0.620 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Bearing Surface Type | CHAMFERED OR WASHER FACED |
| 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 |
|---|---|
| STN-506 PRIMARY | Reliable Tool & Machine Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 12448072 | 7/2 Vendor item drawing reference U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 5310-01-441-1666 is a Nut,plain,hexagon, manufactured by Reliable Tool & Machine Company, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-441-1666 has 1 manufacturer part number on file: STN-506 (Reliable Tool & Machine Company, Inc.).
Key specifications for STN-506: Width Across Flats: 0.790 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN; Thread Series: UNF; Material Document and Classification: SAE J995 GRADE 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 12 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.