The O-Ring, cataloged under National Stock Number 5331-01-527-1598, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-527-1598 |
| Primary Part Number | 7KK590 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Temp Rating | -30.0 CELSIUS AND 120.0 CELSIUS DEGC |
| Cross-Sectional Height | 2.2 MILLIMETERS NOMINAL MM |
| Center Hole Diameter | 19.3 MILLIMETERS NOMINAL MM |
| Material | RUBBER BUTADIENE NITRILE |
| 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 |
|---|---|
| 7KK590 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 7KK590 | 3/9 Design control — primary reference Oshkosh Corp |
NSN 5331-01-527-1598 is a O-Ring, manufactured by Oshkosh Defense Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-527-1598 has 1 manufacturer part number on file: 7KK590 (Oshkosh Defense Llc).
Key specifications for 7KK590: Temp Rating: -30.0 CELSIUS AND 120.0 CELSIUS DEGC; Cross-Sectional Height: 2.2 MILLIMETERS NOMINAL MM; Special Features: NHA IS CTI GROUP, P/N3298981;PORT ISO THREAD SIZE IS M22 X 1.5; Center Hole Diameter: 19.3 MILLIMETERS NOMINAL MM. 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.