The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-657-2408, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 17 specifications, 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. 2 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 | 5950-00-657-2408 |
| Primary Part Number | 1981442 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Mounting Facility Quantity | 4 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSED |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 1.250 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Mounting Method | THREADED HOLE(S) SINGLE GROUP |
| Body Width | 1.547 INCHES MAXIMUM IN |
| Body Height | 1.469 INCHES MAXIMUM IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 140.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 28.7 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Nominal Thread Size | 0.112 INCHES SINGLE GROUP IN |
| Body Length | 1.828 INCHES MAXIMUM IN |
| Winding Operating Current | 20.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 400.0 HERTZ NOMINAL SINGLE COMPONENT |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 0.938 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Terminal Type and Quantity | 4 WIRE LOOP |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 5950-00-657-2408 is a Transformer,audio Frequency, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-657-2408 has 3 manufacturer part numbers on file: 1981442 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 436299 (Lockheed Martin Corporation Div Rms - Mitchel Field), 1006994 (Lockheed Martin Corporation Div Rms - Mitchel Field).
2 possible matches (shared part number, not a government interchangeability claim): 5930-00-892-9640, 4820-01-253-9511. Verify interchangeability with system specifications before substitution.
Key specifications for 1981442: Mounting Facility Quantity: 4 SINGLE GROUP; Inclosure Type: FULLY INCLOSED; Center to Center Distance Between Mounting Facilities Parallel to Length: 1.250 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Mounting Method: THREADED 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.