The O-Ring, cataloged under National Stock Number 5331-00-221-0373, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parker Hannifin Corporation Div O-Ring Division. Government technical data includes 5 specifications, 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through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-221-0373 |
| Primary Part Number | PRP920-2347 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker Hannifin Corporation Div O-Ring Division |
| Status | ACTIVE |
| Cross-Sectional Height | 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| Outside Diameter | 1.033 INCHES MINIMUM AND 1.065 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 0.969 INCHES MINIMUM AND 0.994 INCHES MAXIMUM IN |
| Material | RUBBER CHLOROPRENE CLASS CR |
| 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 |
|---|---|
| PRP920-2347 | Parker Hannifin Corporation Div O-Ring Division (USA) |
| Reference | Meaning |
|---|---|
| 5-139 C557-70 | 5/9 Secondary reference Parker Hannifin Gmbh O-Ring Division |
| 920-2347 | 5/1 Secondary reference Parker Hannifin Corporation Div O-Ring Division |
| B-20SR533-70 | 5/1 Secondary reference U.S. Government activity |
| MS28900 | 4/1 Identification reference U.S. Government activity |
| 5-139 C557-70 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| MS28900-20 | 2/2 Government specification standardization U.S. Government activity |
| C0557 5-139 | 5/1 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| C0873 5-139 | 5/1 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| PRP568-920-3110-70 | 5/1 Secondary reference Parco, Llc |
| 5-139 C873-70 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 5331-00-221-0373 is a O-Ring, manufactured by Parker Hannifin Corporation Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-221-0373 has 1 manufacturer part number on file: PRP920-2347 (Parker Hannifin Corporation Div O-Ring Division).
9 possible matches (shared part number, not a government interchangeability claim): 5331-00-404-4583, 5331-00-462-4235, 5331-00-771-7679. Verify interchangeability with system specifications before substitution.
Key specifications for PRP920-2347: Cross-Sectional Height: 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN; Outside Diameter: 1.033 INCHES MINIMUM AND 1.065 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Center Hole Diameter: 0.969 INCHES MINIMUM AND 0.994 INCHES MAXIMUM IN. 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.