The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-490-1353, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Magnetika Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5950-00-490-1353 |
| Primary Part Number | B3817 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Magnetika Inc |
| Status | ACTIVE |
| Transformer Function | LINE |
| Mounting Facility Quantity | 2 SINGLE GROUP2 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSEDFULLY INCLOSED |
| Mounting Method | THREADED STUD(S) SINGLE GROUP |
| Body Width | 1.750 INCHES NOMINAL1.750 INCHES NOMINAL IN |
| Body Height | 1.750 INCHES NOMINAL1.750 INCHES NOMINAL IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 2140.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY2140.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 420.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Winding Shielding Method | INTERNAL SHIELD GROUNDED TO INCLOSURE AND CORE SINGLE COMPONENTINTERNAL SHIELD GROUNDED TO INCLOSURE AND CORE SINGLE COMPONENT |
| Distance Between Mounting Facility Centers | 0.952 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP0.952 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Body Length | 3.250 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 20.0 HERTZ MINIMUM AND 15.0 KILOHERTZ MAXIMUM SINGLE COMPONENT |
| Primary to Secondary Turn Ratio | 5 TO 1 SINGLE COMPONENT5 TO 1 SINGLE COMPONENT |
| Terminal Type and Quantity | 4 WIRE LEAD4 WIRE LEAD |
| 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 |
|---|---|
| B3817 PRIMARY | Magnetika Inc (USA) |
| Reference | Meaning |
|---|---|
| B3817 | 5/9 Secondary reference U.S. Government activity |
NSN 5950-00-490-1353 is a Transformer,audio Frequency, manufactured by Magnetika Inc, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-490-1353 has 1 manufacturer part number on file: B3817 (Magnetika Inc).
Key specifications for B3817: Transformer Function: LINE; Mounting Facility Quantity: 2 SINGLE GROUP2 SINGLE GROUP; Inclosure Type: FULLY INCLOSEDFULLY INCLOSED; Mounting Method: THREADED STUD(S) SINGLE GROUP. 16 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.