The Receiver-Transmitter Subassembly, cataloged under National Stock Number 5821-01-503-0857, is classified within Federal Supply Class 5821 (Radio and Television Communication Equipment, Airborne) of the Communication, Detection, and Coherent Radiation Equipment group. The manufacturer of record is Buffalo Machine Tools of Niagara Inc Div Buffalo Machines Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5821-01-503-0857 |
| Primary Part Number | E5-6654-3 ASSY 4 |
| Item Name | Receiver-Transmitter Subassembly |
| FSC / FSG | 5821 / 58 — Radio and Television Communication Equipment, Airborne |
| Manufacturer | Buffalo Machine Tools of Niagara Inc Div Buffalo Machines Inc |
| Status | ACTIVE |
| Component Type and Quantity | 1 CONTROL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| E5-6654-3 ASSY 4 PRIMARY | Buffalo Machine Tools of Niagara Inc Div Buffalo Machines Inc (USA) |
| Reference | Meaning |
|---|---|
| E5-6654 | D/9 Drawing number reference only Buffalo Machine Tools of Niagara Inc Div Buffalo Machines Inc |
NSN 5821-01-503-0857 is a Receiver-Transmitter Subassembly, manufactured by Buffalo Machine Tools of Niagara Inc Div Buffalo Machines Inc, classified under FSC 5821, Radio and Television Communication Equipment, Airborne. Status: active.
NSN 5821-01-503-0857 has 1 manufacturer part number on file: E5-6654-3 ASSY 4 (Buffalo Machine Tools of Niagara Inc Div Buffalo Machines Inc).
3 possible matches (shared part number, not a government interchangeability claim): 4130-01-503-7045, 5930-01-507-5026, 5930-01-507-5824. Verify interchangeability with system specifications before substitution.
Key specifications for E5-6654-3 ASSY 4: Component Type and Quantity: 1 CONTROL; End Item Identification: CONTROL LOGIC. 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 5821-01-503-0857 has DEMIL Code D. 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.