The Washer,flat, cataloged under National Stock Number 5310-01-642-1966, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | Naval Inventory Control Point Mechanicsburg (CAGE 03950) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-642-1966 |
| Primary Part Number | 2640-808X1 PC 48D4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2640-808X1 PC 48D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 264282085-0035D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| H547-0001-264282085-0035D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7383858-264282085-0035D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2642-820-85-35D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2642-820-85-35 | 5/1 Secondary reference U.S. Government activity |
| 2640-808X1 PC 48 | 3/1 Design control — primary reference U.S. Government activity |
| 264282085-0035 | 5/1 Secondary reference U.S. Government activity |
| H547-0001-264282085-0035 | 5/1 Secondary reference U.S. Government activity |
| 7383858-264282085-0035 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 5310-01-642-1966 is a Washer,flat, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-642-1966 has 5 manufacturer part numbers on file: 2640-808X1 PC 48D4 (Naval Inventory Control Point Mechanicsburg), 264282085-0035D4 (Naval Inventory Control Point Mechanicsburg), H547-0001-264282085-0035D4 (Naval Inventory Control Point Mechanicsburg), 7383858-264282085-0035D4 (Naval Inventory Control Point Mechanicsburg), 2642-820-85-35D4 (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-727-6147. 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.