The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-997-8957, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-00-997-8957 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Status | ACTIVE |
| Mounting Facility Quantity | 2 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSED |
| Mounting Method | THREADED STUD(S) SINGLE GROUP |
| Body Width | 1.250 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN |
| Body Height | 1.625 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN |
| Maximum Transformer Power Rating | 1.0 WATTS SINGLE COMPONENT |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 200.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 5000.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Winding Shielding Method | INTERNAL SHIELD BROUGHT OUT TO TERMINAL SINGLE COMPONENT |
| Distance Between Mounting Facility Centers | 1.250 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Nominal Thread Size | 0.138 INCHES SINGLE GROUP IN |
| Body Length | 1.250 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | TF4RX21AH TYPE |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 3.5 KILOHERTZ MINIMUM AND 7.0 KILOHERTZ MAXIMUM SINGLE COMPONENT |
| Thread Quantity Per Inch | 32 SINGLE GROUP |
| Primary to Secondary Turn Ratio | 1 TO 2.06 SINGLE COMPONENT |
| Terminal Type and Quantity | 9 WIRE HOOK |
| 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 |
| Reference | Meaning |
|---|---|
| 863781 | 5/9 Secondary reference L3 Aviation Products, Inc. Dba L3 Technologies |
| 863780 | 3/9 Design control — primary reference L3 Aviation Products, Inc. Dba L3 Technologies |
NSN 5950-00-997-8957 is a Transformer,audio Frequency, classified under FSC 5950, Coils and Transformers. Status: active.
Key specifications for 5950-00-997-8957: Overall Height: 1.938 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN; Mounting Facility Quantity: 2 SINGLE GROUP; Inclosure Type: FULLY INCLOSED; Mounting Method: THREADED STUD(S) SINGLE GROUP. 20 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.