The O-Ring, cataloged under National Stock Number 5331-01-540-0690, 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-540-0690 |
| Primary Part Number | ST1946-129 |
| 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 | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Center Hole Diameter | 1.534 INCHES MINIMUM AND 1.564 INCHES MAXIMUM 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 |
|---|---|
| ST1946-129 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| 7T0565-129 PRIMARY | Freudenberg-Nok General Partnership Dba International Seal Co Inc (USA) |
| ST1946-129 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 7T0566-129 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 7T0565-129 PRIMARY | Parker-Hannifin Corp Div O-Ring Division (USA) |
NSN 5331-01-540-0690 is a O-Ring, manufactured by Freudenberg-Nok General Partnership Dba International Seal Co Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-540-0690 has 5 manufacturer part numbers on file: ST1946-129 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), 7T0565-129 (Freudenberg-Nok General Partnership Dba International Seal Co Inc), ST1946-129 (Parker-Hannifin Corp Div O-Ring Division), 7T0566-129 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 7T0565-129 (Parker-Hannifin Corp Div O-Ring Division).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-669-4820. Verify interchangeability with system specifications before substitution.
Key specifications for ST1946-129: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Center Hole Diameter: 1.534 INCHES MINIMUM AND 1.564 INCHES MAXIMUM IN; End Item Identification: C-17A AIRCRAFT A. 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.