The O-Ring, cataloged under National Stock Number 5331-00-052-2431, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parco, Llc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5331-00-052-2431 |
| Primary Part Number | S8990-133 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parco, Llc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.101 INCHES NOMINAL 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 |
|---|---|
| S8990-133 PRIMARY | Parco, Llc (USA) |
| S8990-133 PRIMARY | Parker Hannifin Corporation Div O-Ring Division (USA) |
| S8990-133 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| S8990-133 PRIMARY | Federal-Mogul Corp Government Sales Dept (USA) |
| Reference | Meaning |
|---|---|
| S8990-133 | 1/2 Source control — Government-approved source U.S. Government activity |
| S8990-133ES | 5/9 Secondary reference Eriks B.v. |
| S8990-133 | 3/2 Design control — primary reference U.S. Government activity |
| S8990-133 | 5/9 Secondary reference Alliedsignal Inc Dba Allied-Signal Aerospace Co |
NSN 5331-00-052-2431 is a O-Ring, manufactured by Parco, Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-052-2431 has 4 manufacturer part numbers on file: S8990-133 (Parco, Llc), S8990-133 (Parker Hannifin Corporation Div O-Ring Division), S8990-133 (Parker-Hannifin Corp Div O-Ring Division), S8990-133 (Federal-Mogul Corp Government Sales Dept).
Key specifications for S8990-133: Cross-Sectional Height: 0.101 INCHES NOMINAL IN; Material: RUBBER SYNTHETIC. 2 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.