PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18557Reactor

Freed Transformer Co · NSN 5950-00-518-1080 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-518-1080 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-518-1080. Primary manufacturer part number: 18557.
Features
  • Reactor — FSC 5950
  • Inductance Rating: 5.00 HENRY NOMINAL SINGLE COMPONENT SINGLE WINDING
  • Inclosure Type: HERMETICALLY SEALED
  • Reliability Indicator: NOT ESTABLISHED
  • Terminal Type and Quantity: 2 TAB, SOLDER LUG
  • Mounting Method: THREADED STUD(S) SINGLE GROUP
  • DC Resistance Rating in Ohms: 100.000 SINGLE COMPONENT SINGLE WINDING
  • Thread Quantity Per Inch: 32 SINGLE GROUP
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Reactor, cataloged under National Stock Number 5950-00-518-1080, 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 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5950-00-518-1080
Primary Part Number18557
Item NameReactor
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerFreed Transformer Co
StatusCANCELLED
Inductance Rating5.00 HENRY NOMINAL SINGLE COMPONENT SINGLE WINDING
Inclosure TypeHERMETICALLY SEALED
Reliability IndicatorNOT ESTABLISHED
Terminal Type and Quantity2 TAB, SOLDER LUG
Mounting MethodTHREADED STUD(S) SINGLE GROUP
DC Resistance Rating in Ohms100.000 SINGLE COMPONENT SINGLE WINDING
Thread Quantity Per Inch32 SINGLE GROUP
Body Height3.500 INCHES NOMINAL IN
Inductance TypeFIXED
Winding Operating Current150.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE WINDING
Nominal Thread Size0.138 INCHES SINGLE GROUP IN
Body Width2.250 INCHES NOMINAL IN
Center to Center Distance Between Mounting Facilities Parallel to Length2.000 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Center to Center Distance Between Mounting Facilities Parallel to Width1.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Mounting Facility Quantity4 SINGLE GROUP
Body Length2.625 INCHES NOMINAL IN
Winding Quantity1 SINGLE COMPONENT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 7
5306-00-038-1956 INTERCHANGEABLE
Bolt,machine
5930-00-222-7300257831-F4 INTERCHANGEABLE
Switch,rotary
Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch
5950-00-346-282618557 INTERCHANGEABLE
Reactor
Vanguard Electronics, Llc
6145-00-805-3368 INTERCHANGEABLE
Wire,electrical
3110-00-866-419610068338 INTERCHANGEABLE
Bearing,ball,annular
Kingsbury, Inc. Dba Messinger Bearings Div Messinger Bearings
5910-00-945-427018557-1MFD INTERCHANGEABLE
Capacitor
Thales Security Systems Uk Limited
4130-01-459-360618557 INTERCHANGEABLE
Vacu-Discs
Dcm Clean Air Products, Inc.
Cross-Reference Index
Part NumberManufacturer
18557 PRIMARY Freed Transformer Co (USA)
Related Parts
5306-00-038-1956INTERCHANGEABLE
BOLT,MACHINE
5930-00-222-7300INTERCHANGEABLE
SWITCH,ROTARY
257831-F4
5950-00-346-2826INTERCHANGEABLE
REACTOR
18557
6145-00-805-3368INTERCHANGEABLE
WIRE,ELECTRICAL
3110-00-866-4196INTERCHANGEABLE
BEARING,BALL,ANNULAR
10068338
5910-00-945-4270INTERCHANGEABLE
CAPACITOR
18557-1MFD
4130-01-459-3606INTERCHANGEABLE
VACU-DISCS
18557

Frequently Asked Questions

What is NSN 5950-00-518-1080?

NSN 5950-00-518-1080 is a Reactor, manufactured by Freed Transformer Co, classified under FSC 5950 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5950-00-518-1080?

NSN 5950-00-518-1080 has 1 cross-referenced part number: 18557 (Freed Transformer Co).

What NSN replaces 5950-00-518-1080?

There are 7 known substitutes for 5950-00-518-1080: 5306-00-038-1956, 5930-00-222-7300, 5950-00-346-2826 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 18557?

Key specifications for 18557: Inductance Rating: 5.00 HENRY NOMINAL SINGLE COMPONENT SINGLE WINDING; Inclosure Type: HERMETICALLY SEALED; Reliability Indicator: NOT ESTABLISHED; Terminal Type and Quantity: 2 TAB, SOLDER LUG. 18 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5950-00-518-1080 still in active supply?

NSN 5950-00-518-1080 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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