PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18866Transformer,power

Freed Transformer Co · NSN 5950-00-647-5175 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-647-5175 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-647-5175. Primary manufacturer part number: 18866.
Features
  • Transformer,power — FSC 5950
  • Reliability Indicator: NOT ESTABLISHED
  • Mounting Facility Quantity: 4 SINGLE GROUP
  • Winding Operating Current: 1.75 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY
  • Thread Quantity Per Inch: 32 SINGLE GROUP
  • Winding Operating Voltage: 2.80 AC KILOVOLTS NOMINAL SINGLE COMPONENT SECOND SECONDARY
  • Winding Operating Voltage: 2.50 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
  • Mounting Method: THREADED STUD(S) SINGLE GROUP
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-00-647-5175, 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 Freed Transformer Co. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-00-647-5175
Primary Part Number18866
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerFreed Transformer Co
StatusACTIVE
Reliability IndicatorNOT ESTABLISHED
Mounting Facility Quantity4 SINGLE GROUP
Winding Operating Current1.75 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY
Thread Quantity Per Inch32 SINGLE GROUP
Winding Operating Voltage2.80 AC KILOVOLTS NOMINAL SINGLE COMPONENT SECOND SECONDARY
Winding Operating Voltage2.50 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
Mounting MethodTHREADED STUD(S) SINGLE GROUP
Winding Operating Voltage117.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Winding Operating Current1.0 MILLIAMPERES AC MAXIMUM SINGLE COMPONENT SECOND SECONDARY
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Nominal Thread Size0.138 INCHES SINGLE GROUP IN
Body Length3.375 INCHES NOMINAL IN
Body Width3.125 INCHES NOMINAL IN
Center to Center Distance Between Mounting Facilities Parallel to Width2.125 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Winding Function and Quantity1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT
Body Height3.750 INCHES NOMINAL IN
Inclosure TypeHERMETICALLY SEALED
Winding Shielding MethodINTERNAL SHIELD GROUNDED TO INCLOSURE SINGLE COMPONENT
Terminal Type and Quantity6 STANDOFF INSULATOR
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Center to Center Distance Between Mounting Facilities Parallel to Length2.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Frequency Rating60.0 HERTZ NOMINAL SINGLE COMPONENT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5120-00-223-9131 INTERCHANGEABLE
Edger,concrete
5307-00-496-314106224 INTERCHANGEABLE
Stud,shouldered
Hayes Wheels Intl Inc Akron Opns
3120-00-689-314918866 INTERCHANGEABLE
Bearing,washer,thrust
Altra Industrial Motion Corp.
5340-01-274-27443891T18 INTERCHANGEABLE
Strap,elastic
Mcmaster-Carr Supply Co
6680-01-507-2448 INTERCHANGEABLE
Speed Sensor,turbine Engine
Cross-Reference Index
Part NumberManufacturer
18866 PRIMARY Freed Transformer Co (USA)
06224 PRIMARY L3harris Technologies, Inc. Div Space and Airborne Systems (USA)
Related Parts
5120-00-223-9131INTERCHANGEABLE
EDGER,CONCRETE
5307-00-496-3141INTERCHANGEABLE
STUD,SHOULDERED
06224
3120-00-689-3149INTERCHANGEABLE
BEARING,WASHER,THRUST
18866
5340-01-274-2744INTERCHANGEABLE
STRAP,ELASTIC
3891T18
6680-01-507-2448INTERCHANGEABLE
SPEED SENSOR,TURBINE ENGINE

Frequently Asked Questions

What is NSN 5950-00-647-5175?

NSN 5950-00-647-5175 is a Transformer,power, manufactured by Freed Transformer Co, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-00-647-5175?

NSN 5950-00-647-5175 has 2 cross-referenced part numbers: 18866 (Freed Transformer Co), 06224 (L3harris Technologies, Inc. Div Space and Airborne Systems).

What NSN replaces 5950-00-647-5175?

There are 5 known substitutes for 5950-00-647-5175: 5120-00-223-9131, 5307-00-496-3141, 3120-00-689-3149 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 18866?

Key specifications for 18866: Reliability Indicator: NOT ESTABLISHED; Mounting Facility Quantity: 4 SINGLE GROUP; Winding Operating Current: 1.75 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY; Thread Quantity Per Inch: 32 SINGLE GROUP. 22 total characteristics are documented in the Federal Logistics Information System.

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