The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-487-7918, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 17 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-00-487-7918 |
| Primary Part Number | 663861 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Mounting Facility Quantity | 4 SINGLE GROUP4 SINGLE GROUP |
| Inclosure Type | HERMETICALLY SEALED |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 1.656 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP1.656 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Mounting Method | FLANGE AND FLANGE AND UNTHREADED HOLE(S) SINGLE GROUPUNTHREADED HOLE(S) SINGLE GROUP |
| Body Width | 1.047 INCHES NOMINAL1.047 INCHES NOMINAL IN |
| Body Height | 2.094 INCHES NOMINAL IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 408.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY408.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Impedance Rating in Ohms | 6700.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Winding Shielding Method | INTERNAL SHIELD GROUNDED TO INCLOSURE AND BROUGHT OUT TO TERMINAL SINGLE COMPONENT |
| Body Length | 1.344 INCHES NOMINAL IN |
| Winding Operating Current | 20.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY |
| Winding Operating Current | 45.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY45.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY |
| Reliability Indicator | NOT ESTABLISHEDNOT ESTABLISHED |
| Frequency Rating | 60.0 HERTZ MAXIMUM SINGLE COMPONENT60.0 HERTZ MAXIMUM SINGLE COMPONENT |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 0.599 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP0.599 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Terminal Type and Quantity | 5 WIRE HOOK |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 663861 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| 663861 | C/1 Advisory reference — outside the item-of-supply concept Honeywell International Inc. Dba Honeywell International |
NSN 5950-00-487-7918 is a Transformer,audio Frequency, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-487-7918 has 1 manufacturer part number on file: 663861 (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 663861: Mounting Facility Quantity: 4 SINGLE GROUP4 SINGLE GROUP; Inclosure Type: HERMETICALLY SEALED; Center to Center Distance Between Mounting Facilities Parallel to Length: 1.656 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP1.656 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Mounting Method: FLANGE AND FLANGE AND UNTHREADED HOLE(S) SINGLE GROUPUNTHREADED HOLE(S) SINGLE GROUP. 17 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.