The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-645-6404, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Freed Transformer Co. Government technical data includes 19 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5950-00-645-6404 |
| Primary Part Number | 34811 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Freed Transformer Co |
| Status | ACTIVE |
| Transformer Function | INPUT |
| Mounting Facility Quantity | 2 SINGLE GROUP |
| Inclosure Type | HERMETICALLY SEALED |
| Mounting Method | THREADED STUD(S) SINGLE GROUP |
| Body Width | 0.562 INCHES NOMINAL IN |
| Body Height | 1.312 INCHES NOMINAL IN |
| Maximum Transformer Power Rating | 10.0 MILLIWATTS SINGLE COMPONENT |
| Winding Function and Quantity | 1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 600.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 1200.0 NOMINAL SINGLE COMPONENT ALL SECONDARY |
| Distance Between Mounting Facility Centers | 0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Nominal Thread Size | 0.138 INCHES SINGLE GROUP IN |
| Body Length | 0.688 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 300.0 HERTZ MINIMUM AND 20.0 KILOHERTZ MAXIMUM SINGLE COMPONENT |
| Thread Quantity Per Inch | 32 SINGLE GROUP |
| Primary to Secondary Turn Ratio | 1 TO 1 TO 1 SINGLE COMPONENT |
| Terminal Type and Quantity | 6 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 |
| Part Number | Manufacturer |
|---|---|
| 34811 | Freed Transformer Co (USA) |
| Reference | Meaning |
|---|---|
| GA50772 | 5/9 Secondary reference At and T Corp |
| S0-C-62524 | 5/9 Secondary reference U.S. Government activity |
| S0D62524 | 5/9 Secondary reference American Telephone and Telegraph Co |
| SCD62524 | 3/2 Design control — primary reference U.S. Government activity |
| S0D62524 | 5/9 Secondary reference Suda, E H, Inc Dba Fabtron Div Fabtron |
| SCC62524 | 5/2 Secondary reference U.S. Government activity |
| S0D62524 | 5/2 Secondary reference U.S. Government activity |
| GA50772 | 5/9 Secondary reference American Telephone and Telegraph Co |
| S0D62524 | 5/9 Secondary reference At and T Corp |
NSN 5950-00-645-6404 is a Transformer,audio Frequency, manufactured by Freed Transformer Co, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-645-6404 has 1 manufacturer part number on file: 34811 (Freed Transformer Co).
2 possible matches (shared part number, not a government interchangeability claim): 5985-00-779-5697, 5975-01-174-5592. Verify interchangeability with system specifications before substitution.
Key specifications for 34811: Overall Height: 1.688 INCHES NOMINAL IN; Transformer Function: INPUT; Mounting Facility Quantity: 2 SINGLE GROUP; Inclosure Type: HERMETICALLY SEALED. 19 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.