The Washer,lock, cataloged under National Stock Number 5310-01-591-4829, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-591-4829 |
| Primary Part Number | 40378 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastenal Company Dba Fastenal Co |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTM B695, TYPE 1, CLASS 50 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 6.2 MILLIMETERS MAXIMUM MM |
| Material Thickness | 0.7 MILLIMETERS MINIMUM AND 0.9 MILLIMETERS MAXIMUM MM |
| Surface Treatment | ZINC OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 3.1 MILLIMETERS MINIMUM AND 3.4 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 40378 PRIMARY | Fastenal Company Dba Fastenal Co (USA) |
| Reference | Meaning |
|---|---|
| 12759-01319 | C/1 Advisory reference — outside the item-of-supply concept Fastenal Company Dba Fastenal Co |
NSN 5310-01-591-4829 is a Washer,lock, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-591-4829 has 1 manufacturer part number on file: 40378 (Fastenal Company Dba Fastenal Co).
Key specifications for 40378: Surface Treatment Document and Classification: ASTM B695, TYPE 1, CLASS 50 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM; Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 6.2 MILLIMETERS MAXIMUM MM. 8 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.