The Fitting,tee,aircraft, cataloged under National Stock Number 1650-01-666-8378, is classified within Federal Supply Class 1650 (Aircraft Hydraulic, Vacuum, and De-icing System Components) of the Aircraft Components and Accessories group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 1650-01-666-8378 |
| Primary Part Number | AS85421/4T121212 |
| Item Name | Fitting,tee,aircraft |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Criticality Code Justification | AGAV |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| AS85421/4T121212 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| DMYNO-81343-039 | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| AS85421/4 | 5/1 Secondary reference Sae International Dba Sae International |
NSN 1650-01-666-8378 is a Fitting,tee,aircraft, manufactured by Sae International Dba Sae International, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
NSN 1650-01-666-8378 has 1 manufacturer part number on file: AS85421/4T121212 (Sae International Dba Sae International).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-719-0594. Verify interchangeability with system specifications before substitution.
Key specifications for AS85421/4T121212: Criticality Code Justification: AGAV; Part Name Assigned by Controlling Agency: FITTING,TEE; End Item Identification: CRITICAL APPLICATION ITEM (CAI);CH-53K SIKORSKY HEAVY LIFT HELICOPTER. 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 1650-01-666-8378 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.