The O-Ring, cataloged under National Stock Number 5331-00-133-1990, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Freudenberg-Nok General Partnership. Government technical data includes 4 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-133-1990 |
| Primary Part Number | OR2-051-9251 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Freudenberg-Nok General Partnership |
| Status | ACTIVE |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Outside Diameter | 0.691 INCHES NOMINAL IN |
| Center Hole Diameter | 0.546 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| OR2-051-9251 PRIMARY | Freudenberg-Nok General Partnership (USA) |
| Reference | Meaning |
|---|---|
| ARP568-015IDSA9250 | 5/9 Secondary reference Freudenberg-Nok General Partnership |
| 0006-11-0015 | 5/9 Secondary reference U.S. Government activity |
| J9150-05PC53 | 5/9 Secondary reference U.S. Government activity |
| OR2-015-9251 | 5/9 Secondary reference Freudenberg-Nok General Partnership |
NSN 5331-00-133-1990 is a O-Ring, manufactured by Freudenberg-Nok General Partnership, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-133-1990 has 1 manufacturer part number on file: OR2-051-9251 (Freudenberg-Nok General Partnership).
Key specifications for OR2-051-9251: Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Outside Diameter: 0.691 INCHES NOMINAL IN; Center Hole Diameter: 0.546 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN; Material: RUBBER SYNTHETIC. 4 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.