The O-Ring, cataloged under National Stock Number 5331-01-728-6739, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Sun Hydraulics Corporation. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5331-01-728-6739 |
| Primary Part Number | 500-051-590 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Sun Hydraulics Corporation |
| Status | ACTIVE |
| Temp Rating | -22.0 FAHRENHEIT AND 230.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.050 INCHES NOMINAL IN |
| Outside Diameter | 0.640 INCHES NOMINAL IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 0.590 INCHES NOMINAL IN |
| Cross-Sectional Diameter | 0.050 INCHES NOMINAL IN |
| 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 |
|---|---|
| 500-051-590 PRIMARY | Sun Hydraulics Corporation (USA) |
| Reference | Meaning |
|---|---|
| D013U120 | 7/2 Vendor item drawing reference Oshkosh Defense Llc |
NSN 5331-01-728-6739 is a O-Ring, manufactured by Sun Hydraulics Corporation, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-728-6739 has 1 manufacturer part number on file: 500-051-590 (Sun Hydraulics Corporation).
Key specifications for 500-051-590: Temp Rating: -22.0 FAHRENHEIT AND 230.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.050 INCHES NOMINAL IN; Outside Diameter: 0.640 INCHES NOMINAL IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL. 6 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.