The O-Ring, cataloged under National Stock Number 5331-01-008-3145, 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 3 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-008-3145 |
| Primary Part Number | S8990-591 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker Hannifin Corporation Div O-Ring Division |
| Status | ACTIVE |
| Cross-Sectional Height | 0.027 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.176 INCHES MINIMUM AND 0.186 INCHES MAXIMUM IN |
| Material | RUBBER SILICONE CLASS Q |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| S8990-591 | Parker Hannifin Corporation Div O-Ring Division (USA) |
| S8990-591 | Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road) (USA) |
| S8990-591 | Parker-Hannifin Corp Div O-Ring Division (USA) |
| S8990-591 | Parco, Llc (USA) |
| S8990-591 | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| Reference | Meaning |
|---|---|
| S8990-591 | 5/2 Secondary reference U.S. Government activity |
| S8990-591 | 3/2 Design control — primary reference U.S. Government activity |
| S8990-591 | 5/9 Secondary reference Rubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp |
| 10163361 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| S8990-591 | 5/9 Secondary reference Hutchinson Seal Corporation |
| S8990-591 | 5/2 Secondary reference U.S. Government activity |
NSN 5331-01-008-3145 is a O-Ring, manufactured by Parker Hannifin Corporation Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-008-3145 has 5 manufacturer part numbers on file: S8990-591 (Parker Hannifin Corporation Div O-Ring Division), S8990-591 (Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)), S8990-591 (Parker-Hannifin Corp Div O-Ring Division), S8990-591 (Parco, Llc), S8990-591 (Freudenberg-Nok General Partnership Dba International Seal Co Inc).
Key specifications for S8990-591: Cross-Sectional Height: 0.027 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN; Center Hole Diameter: 0.176 INCHES MINIMUM AND 0.186 INCHES MAXIMUM IN; Material: RUBBER SILICONE CLASS Q. 3 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.