The Washer,flat, cataloged under National Stock Number 5310-01-504-2731, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bourns Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-504-2731 |
| Primary Part Number | 19933 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bourns Inc |
| Status | ACTIVE |
| Material | STEEL COMP 304 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 |
|---|---|
| 19933 PRIMARY | Bourns Inc (USA) |
| Reference | Meaning |
|---|---|
| 19933 | 3/9 Design control — primary reference Cat Pumps Corp |
NSN 5310-01-504-2731 is a Washer,flat, manufactured by Bourns Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-504-2731 has 1 manufacturer part number on file: 19933 (Bourns Inc).
1 possible match (shared part number, not a government interchangeability claim): 8465-01-590-0282. Verify interchangeability with system specifications before substitution.
Key specifications for 19933: End Item Identification: MODEL 241 3 FRAME PLUNGER PUMP; Material: STEEL COMP 304 OVERALL. 1 specification is 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.