The O-Ring, cataloged under National Stock Number 5331-01-540-4490, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Freudenberg-Nok General Partnership Dba International Seal Co Inc. Government technical data includes 2 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-540-4490 |
| Primary Part Number | 7T0565-145 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Freudenberg-Nok General Partnership Dba International Seal Co Inc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.103 INCHES NOMINAL IN |
| Center Hole Diameter | 2.550 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 |
|---|---|
| 7T0565-145 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| ST1946-145 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| 7T0566-145 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 7T0565-145 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| ST1946-145 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
NSN 5331-01-540-4490 is a O-Ring, manufactured by Freudenberg-Nok General Partnership Dba International Seal Co Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-540-4490 has 5 manufacturer part numbers on file: 7T0565-145 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), ST1946-145 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), 7T0566-145 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 7T0565-145 (Parker-Hannifin Corp Div O-Ring Division), ST1946-145 (Parker-Hannifin Corp Div O-Ring Division).
Key specifications for 7T0565-145: Cross-Sectional Height: 0.103 INCHES NOMINAL IN; Center Hole Diameter: 2.550 INCHES NOMINAL IN; End Item Identification: C17A AIRCRAFT. 2 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.