The O-Ring, cataloged under National Stock Number 5331-01-491-4479, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corp Div O-Ring Division. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-491-4479 |
| Primary Part Number | 2-020 N0951-75 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corp Div O-Ring Division |
| Status | ACTIVE |
| Cross-Sectional Height | 1.000 INCHES NOMINAL IN |
| Center Hole Diameter | 0.875 INCHES NOMINAL IN |
| Material | RUBBER |
| 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 |
|---|---|
| 2-020 N0951-75 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 23247--03423 | Leonardo Uk Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 23247--03423 | 5/9 Secondary reference Leonardo Mw Ltd |
| 2-020 N0741-75 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 5331-01-491-4479 is a O-Ring, manufactured by Parker-Hannifin Corp Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-491-4479 has 2 manufacturer part numbers on file: 2-020 N0951-75 (Parker-Hannifin Corp Div O-Ring Division), 23247--03423 (Leonardo Uk Ltd).
Key specifications for 2-020 N0951-75: Cross-Sectional Height: 1.000 INCHES NOMINAL IN; Center Hole Diameter: 0.875 INCHES NOMINAL IN; End Item Identification: ARI 23478 TIALD STTE; Material: RUBBER. 3 specifications are 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.