The O-Ring, cataloged under National Stock Number 5331-01-479-0599, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corp Div O-Ring Division. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5331-01-479-0599 |
| Primary Part Number | 2-021 NBR |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corp Div O-Ring Division |
| Status | ACTIVE |
| Cross-Sectional Height | 0.070 INCHES NOMINAL IN |
| Color | BLACK |
| Center Hole Diameter | 0.930 INCHES NOMINAL IN |
| Material | RUBBER NATURAL |
| 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 |
|---|---|
| 2-021 NBR PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| Reference | Meaning |
|---|---|
| 3541812 | 5/9 Secondary reference Oshkosh Corp |
| 2-021 N0552 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 3541812 | 5/1 Secondary reference Oshkosh Defense Llc |
| 1HB220 | 5/9 Secondary reference Oshkosh Corp |
NSN 5331-01-479-0599 is a O-Ring, manufactured by Parker-Hannifin Corp Div O-Ring Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-479-0599 has 1 manufacturer part number on file: 2-021 NBR (Parker-Hannifin Corp Div O-Ring Division).
Key specifications for 2-021 NBR: Cross-Sectional Height: 0.070 INCHES NOMINAL IN; Color: BLACK; Center Hole Diameter: 0.930 INCHES NOMINAL IN; End Item Identification: FORWARD REPAIR SYSTEM MODEL M7 NSN 3990-01-463-4940; NSN 2320-01-304-2277 PLS (PALLETIZED LOADING SYSTEM),3990-01-444-6174 BITUM DISTRIBUTOR; MRAP - M-ATV. 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.