The Washer,backup, cataloged under National Stock Number 5310-01-124-1786, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Us Jack Co. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Item Name | Washer,backup |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Us Jack Co (CAGE 0E3L5) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-124-1786 |
| Primary Part Number | D-6437 |
| Item Name | Washer,backup |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Us Jack Co |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| D-6437 PRIMARY | Us Jack Co (USA) |
| Reference | Meaning |
|---|---|
| D-6437 | 5/9 Secondary reference Jay-Em Aerospace Corporation |
NSN 5310-01-124-1786 is a Washer,backup, manufactured by Us Jack Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-124-1786 has 1 manufacturer part number on file: D-6437 (Us Jack Co).
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.