PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

25A35Transformer,audio Frequency

Thordarson Inc · NSN 5950-00-731-1854 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-731-1854 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-731-1854. Primary manufacturer part number: 25A35.
Features
  • Transformer,audio Frequency — FSC 5950
  • Reliability Indicator: NOT ESTABLISHED
  • Impedance Rating in Ohms: 15000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
  • Impedance Rating in Ohms: 60000.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY
  • Body Outside Diameter: 0.875 INCHES NOMINAL IN
  • Mounting Method: THREADED HOLE(S) SINGLE GROUP
  • Terminal Type and Quantity: 4 TAB, SOLDER LUG
  • Mounting Facility Quantity: 4 SINGLE GROUP
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-731-1854, is classified within Federal Supply Class 5950 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Thordarson Inc. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5950-00-731-1854
Primary Part Number25A35
Item NameTransformer,audio Frequency
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerThordarson Inc
StatusCANCELLED
Reliability IndicatorNOT ESTABLISHED
Impedance Rating in Ohms15000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Impedance Rating in Ohms60000.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY
Body Outside Diameter0.875 INCHES NOMINAL IN
Mounting MethodTHREADED HOLE(S) SINGLE GROUP
Terminal Type and Quantity4 TAB, SOLDER LUG
Mounting Facility Quantity4 SINGLE GROUP
Nominal Thread Size0.086 INCHES SINGLE GROUP IN
Frequency Rating30.0 HERTZ MINIMUM AND 20.0 KILOHERTZ MAXIMUM SINGLE COMPONENT
Winding Function and Quantity1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
Maximum Transformer Power Rating6.3 MILLIWATTS SINGLE COMPONENT
Inclosure TypeHERMETICALLY SEALED
Body Length1.188 INCHES NOMINAL IN
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
8105-00-117-98698105-00-117-9869 INTERCHANGEABLE
Sack,shipping
General Services Administration Federal Supply Service
5999-00-135-4939 INTERCHANGEABLE
Shielding Gasket,electronic
5120-00-278-9926311S1GFJ INTERCHANGEABLE
Mirror,inspection
Shaw's Enterprises, Incorporated Dba Se Tools
6625-00-435-3157 INTERCHANGEABLE
Absorber,radio Frequency Radiati
5895-00-450-4844004638 INTERCHANGEABLE
Modulator Subassembly
Moog Inc Div Moog Inc., Space and Defense - Salt Lake City
5999-00-481-5608 INTERCHANGEABLE
Shielding Gasket,electronic
5950-00-803-4708375MS157G002 INTERCHANGEABLE
Coil,radio Frequency
Raytheon Company Dba Raytheon Co
5340-01-008-10731004 INTERCHANGEABLE
Key Blank
Ilco Unican Corp Dba Wolf Sales
3110-01-232-1316 INTERCHANGEABLE
Bearing,ball,annular
6210-01-343-550704-690030 INTERCHANGEABLE
Indicator,light
Illinois Tool Works Inc Dba Illinois Tool Works Inc Div Illinois Tool Works
Cross-Reference Index
Part NumberManufacturer
25A35 PRIMARY Thordarson Inc (USA)
0-4 United Transformer Corp Sub of Opt Industries Inc (USA)
0-4 Magnetika Inc (USA)
Related Parts
8105-00-117-9869INTERCHANGEABLE
SACK,SHIPPING
8105-00-117-9869
5999-00-135-4939INTERCHANGEABLE
SHIELDING GASKET,ELECTRONIC
5120-00-278-9926INTERCHANGEABLE
MIRROR,INSPECTION
311S1GFJ
6625-00-435-3157INTERCHANGEABLE
ABSORBER,RADIO FREQUENCY RADIATI
5895-00-450-4844INTERCHANGEABLE
MODULATOR SUBASSEMBLY
004638
5999-00-481-5608INTERCHANGEABLE
SHIELDING GASKET,ELECTRONIC
5950-00-803-4708INTERCHANGEABLE
COIL,RADIO FREQUENCY
375MS157G002
5340-01-008-1073INTERCHANGEABLE
KEY BLANK
1004
3110-01-232-1316INTERCHANGEABLE
BEARING,BALL,ANNULAR
6210-01-343-5507INTERCHANGEABLE
INDICATOR,LIGHT
04-690030
2930-01-461-7611INTERCHANGEABLE
RADIATOR,ENGINE COOLANT
4130-01-647-9746INTERCHANGEABLE
FILTER ELEMENT,AIR CONDITIONING
04

Frequently Asked Questions

What is NSN 5950-00-731-1854?

NSN 5950-00-731-1854 is a Transformer,audio Frequency, manufactured by Thordarson Inc, classified under FSC 5950 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5950-00-731-1854?

NSN 5950-00-731-1854 has 3 cross-referenced part numbers: 25A35 (Thordarson Inc), 0-4 (United Transformer Corp Sub of Opt Industries Inc), 0-4 (Magnetika Inc).

What NSN replaces 5950-00-731-1854?

There are 12 known substitutes for 5950-00-731-1854: 8105-00-117-9869, 5999-00-135-4939, 5120-00-278-9926 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 25A35?

Key specifications for 25A35: Reliability Indicator: NOT ESTABLISHED; Impedance Rating in Ohms: 15000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY; Impedance Rating in Ohms: 60000.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY; Body Outside Diameter: 0.875 INCHES NOMINAL IN. 14 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5950-00-731-1854 still in active supply?

NSN 5950-00-731-1854 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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