The Seal Ring,labyrinth,aircraft Gas, cataloged under National Stock Number 2840-00-352-1989, is classified within Federal Supply Class 2840 (Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 2840-00-352-1989 |
| Primary Part Number | 4009841 |
| Item Name | Seal Ring,labyrinth,aircraft Gas |
| FSC / FSG | 2840 / 28 — Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Diameter | 4.960 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 4009841 | Rtx Corporation Div Pratt & Whitney (USA) |
| 4009841 | Paramount Machine Company, Inc. Dba Paramount Machine Co Inc (USA) |
| 4009841 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 4009841 | 5/9 Secondary reference Norton Canada Inc |
| 4009841 | 5/9 Secondary reference Kaydon Ring & Seal Inc Dba Skf Precision Technologies |
| 4009841 | 5/9 Secondary reference Sargent Aerospace & Defense, Llc Dba Airtomic Div Sargent |
| 4009841 | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 4009841 | 5/9 Secondary reference Harco Technologies Corp |
| 4009841 | 5/9 Secondary reference American Tubular Elevator Co |
NSN 2840-00-352-1989 is a Seal Ring,labyrinth,aircraft Gas, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 2840, Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components. Status: active.
NSN 2840-00-352-1989 has 3 manufacturer part numbers on file: 4009841 (Rtx Corporation Div Pratt & Whitney), 4009841 (Paramount Machine Company, Inc. Dba Paramount Machine Co Inc), 4009841 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
1 possible match (shared part number, not a government interchangeability claim): 5940-00-443-6717. Verify interchangeability with system specifications before substitution.
Key specifications for 4009841: Diameter: 4.960 INCHES NOMINAL IN; End Item Identification: MODEL J57 ACFT ENGINE. 1 specification is 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.
NSN 2840-00-352-1989 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.