The O-Ring, cataloged under National Stock Number 5331-01-656-0609, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rtd Seals Corp Div Hercules Oem. Government technical data includes 3 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-656-0609 |
| Primary Part Number | AS568A-390 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtd Seals Corp Div Hercules Oem |
| Status | ACTIVE |
| Cross-Sectional Height | 0.188 INCHES NOMINAL IN |
| Center Hole Diameter | 21.0 INCHES NOMINAL IN |
| Material | RUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM |
| 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 |
|---|---|
| AS568A-390 PRIMARY | Rtd Seals Corp Div Hercules Oem (USA) |
NSN 5331-01-656-0609 is a O-Ring, manufactured by Rtd Seals Corp Div Hercules Oem, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-656-0609 has 1 manufacturer part number on file: AS568A-390 (Rtd Seals Corp Div Hercules Oem).
Key specifications for AS568A-390: Cross-Sectional Height: 0.188 INCHES NOMINAL IN; Center Hole Diameter: 21.0 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: O RING; End Item Identification: 7010-01-605-1986; COMMAND AND CONTROL SYSTEM. 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.