The Washer,flat, cataloged under National Stock Number 5310-01-587-7543, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Caterpillar Inc Div Caterpillar Defense (CAGE 11083); Bae Systems Land & Armaments L.p. (CAGE 54786); Amz Alabama Inc. (CAGE 076M6) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-587-7543 |
| Primary Part Number | 4397034-003M1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| 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 |
|---|---|
| 4397034-003M1 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| 4397034-003M1 PRIMARY | Bae Systems Land & Armaments L.p. (USA) |
| 4397034-003M1 | Amz Alabama Inc. (USA) |
| Reference | Meaning |
|---|---|
| 6444561 | D/9 Drawing number reference only Bae Systems Survivability Systems Llc |
| 4397034-003M1 | 3/9 Design control — primary reference Bae Systems Survivability Systems Llc |
NSN 5310-01-587-7543 is a Washer,flat, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-587-7543 has 3 manufacturer part numbers on file: 4397034-003M1 (Caterpillar Inc Div Caterpillar Defense), 4397034-003M1 (Bae Systems Land & Armaments L.p.), 4397034-003M1 (Amz Alabama Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-587-7649. Verify interchangeability with system specifications before substitution.
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.