The Washer,flat, cataloged under National Stock Number 5310-01-207-1899, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hydro-Test Products, Inc. Dba Hydro-Test Products Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | Hydro-Test Products, Inc. Dba Hydro-Test Products Inc (CAGE 56043) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-207-1899 |
| Primary Part Number | 61628 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hydro-Test Products, Inc. Dba Hydro-Test Products Inc |
| 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 |
|---|---|
| 61628 PRIMARY | Hydro-Test Products, Inc. Dba Hydro-Test Products Inc (USA) |
NSN 5310-01-207-1899 is a Washer,flat, manufactured by Hydro-Test Products, Inc. Dba Hydro-Test Products Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-207-1899 has 1 manufacturer part number on file: 61628 (Hydro-Test Products, Inc. Dba Hydro-Test Products Inc).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-251-1214. 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.