The O-Ring, cataloged under National Stock Number 5331-01-498-9953, 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 5 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5331-01-498-9953 |
| Primary Part Number | NM506 2-371/4W |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corp Div O-Ring Division |
| Status | ACTIVE |
| Temp Rating | -70.0 FAHRENHEIT AND 180.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| Hardness Rating | 65.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 8.425 INCHES MINIMUM AND 8.525 INCHES MAXIMUM IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| 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 |
|---|---|
| NM506 2-371/4W PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 12528494 PRIMARY | Army, United States Department of the Dba Watervliet Arsenal Div Business Development (USA) |
| AS568-371 N466 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| Reference | Meaning |
|---|---|
| N0506 2-371/4W | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 5331014989953 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| AS568-371 N466 | 5/9 Secondary reference International Seal Co |
NSN 5331-01-498-9953 is a O-Ring, manufactured by Parker-Hannifin Corp Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-498-9953 has 3 manufacturer part numbers on file: NM506 2-371/4W (Parker-Hannifin Corp Div O-Ring Division), 12528494 (Army, United States Department of the Dba Watervliet Arsenal Div Business Development), AS568-371 N466 (Freudenberg-Nok General Partnership Dba International Seal Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-619-8095. Verify interchangeability with system specifications before substitution.
Key specifications for NM506 2-371/4W: Temp Rating: -70.0 FAHRENHEIT AND 180.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; Hardness Rating: 65.0 SHORE DUROMETER A NOMINAL; Special Features: WHITE MARKS IN FOUR LOCATIONS,EQUALLY SPACED. 5 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.