The Nut,plain,extended Washer,hexago, cataloged under National Stock Number 5310-01-540-1914, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Earnest Machine Products Co. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-540-1914 |
| Primary Part Number | 831148 |
| Item Name | Nut,plain,extended Washer,hexago |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Earnest Machine Products Co |
| Status | ACTIVE |
| Washer Outside Diameter | 1.248 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN |
| Width Across Flats | 0.938 INCHES NOMINAL IN |
| Thread Tolerance Class | B INTERNAL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Material Document and Classification | ASTM A563 GRADE B ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Size | 0.625 INCHES IN |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 3 |
| Thread Quantity Per Inch | 11 |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 831148 PRIMARY | Earnest Machine Products Co (USA) |
| Reference | Meaning |
|---|---|
| 12486406 | 7/2 Vendor item drawing reference U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 5310-01-540-1914 is a Nut,plain,extended Washer,hexago, manufactured by Earnest Machine Products Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-540-1914 has 1 manufacturer part number on file: 831148 (Earnest Machine Products Co).
Key specifications for 831148: Overall Height: 0.545 INCHES MINIMUM AND 0.569 INCHES MAXIMUM IN; Washer Outside Diameter: 1.248 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN; Width Across Flats: 0.938 INCHES NOMINAL IN; Thread Tolerance Class: B INTERNAL. 11 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.