The Washer,flat, cataloged under National Stock Number 5310-01-203-0108, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (CAGE 09990); Ministerie Van Defensie Clastekeningen, Tekeningenarchief (CAGE H0099) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-203-0108 |
| Primary Part Number | 1820-001 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| 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 |
|---|---|
| 1820-001 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA) |
| 5330 202 | Ministerie Van Defensie Clastekeningen, Tekeningenarchief (NLD) |
| Reference | Meaning |
|---|---|
| 1820-001 | 3/9 Design control — primary reference Parker Hannifin Corporation Dba Gresen Hydraulics Div Hydraulic Valve Division |
NSN 5310-01-203-0108 is a Washer,flat, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-203-0108 has 2 manufacturer part numbers on file: 1820-001 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division), 5330 202 (Ministerie Van Defensie Clastekeningen, Tekeningenarchief).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-266-0899, 5310-01-334-7388. 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.