The O-Ring, cataloged under National Stock Number 5331-00-822-0081, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5331-00-822-0081 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Status | ACTIVE |
| Cross-Sectional Height | 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| Outside Diameter | 0.575 INCHES MINIMUM AND 0.601 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 0.516 INCHES MINIMUM AND 0.541 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 |
| Reference | Meaning |
|---|---|
| PRP568-912-3110-70 | 5/9 Secondary reference Parco, Llc |
| 5-135 C557-70 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 912-2347 | 5/9 Secondary reference Parker Hannifin Corporation Div O-Ring Division |
| 5-135 C873-70 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| B-12SR533-70 | 5/9 Secondary reference U.S. Government activity |
| PRP912-2347 | 5/9 Secondary reference Parker Hannifin Corporation Div O-Ring Division |
| MS28900-12 | 2/2 Government specification standardization U.S. Government activity |
| MS28900 | 4/1 Identification reference U.S. Government activity |
| 5-135 C557-70 | 5/9 Secondary reference Parker Hannifin Gmbh O-Ring Division |
NSN 5331-00-822-0081 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5331-00-822-0082, 5331-00-938-9102, 5331-01-612-8998. Verify interchangeability with system specifications before substitution.
Key specifications for 5331-00-822-0081: Cross-Sectional Height: 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN; Outside Diameter: 0.575 INCHES MINIMUM AND 0.601 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Center Hole Diameter: 0.516 INCHES MINIMUM AND 0.541 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.