PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

661820Reactor

Lockheed Martin Corporation Div Rms - Mitchel Field · NSN 5950-00-487-7913 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-487-7913 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-487-7913. Primary manufacturer part number: 661820.
Features
  • Reactor — FSC 5950
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
  • Body Length: 1.938 INCHES NOMINAL IN
  • Distance Between Mounting Facility Centers: 1.343 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Terminal Type and Quantity: 3 WIRE HOOK
  • Nominal Thread Size: 0.138 INCHES SINGLE GROUP IN
  • Rating Method: ELECTRICAL SINGLE COMPONENT SINGLE WINDING
  • Inclosure Type: HERMETICALLY SEALED
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Reactor, cataloged under National Stock Number 5950-00-487-7913, 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 Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-00-487-7913
Primary Part Number661820
Item NameReactor
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerLockheed Martin Corporation Div Rms - Mitchel Field
StatusACTIVE
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Body Length1.938 INCHES NOMINAL IN
Distance Between Mounting Facility Centers1.343 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Terminal Type and Quantity3 WIRE HOOK
Nominal Thread Size0.138 INCHES SINGLE GROUP IN
Rating MethodELECTRICAL SINGLE COMPONENT SINGLE WINDING
Inclosure TypeHERMETICALLY SEALED
Inductance Rating1.15 HENRY NOMINAL SINGLE COMPONENT SINGLE WINDING
Body Width1.140 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
Mounting MethodTHREADED HOLE(S) SINGLE GROUP
Frequency Rating820.0 HERTZ NOMINAL SINGLE COMPONENT
Winding Quantity1 SINGLE COMPONENT
Reliability IndicatorNOT ESTABLISHED
DC Resistance Rating in Ohms180.000 SINGLE COMPONENT SINGLE WINDING
Thread Quantity Per Inch32 SINGLE GROUP
Mounting Facility Quantity2 SINGLE GROUP
Maximum Operating Temp105.0 CELSIUS DEGC
Inductance TypeMECHANICALLY ADJUSTABLE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5920-00-142-74584397 INTERCHANGEABLE
Fuseholder,block
Cooper Bussmann, Llc Dba Cooper Industries
5961-00-572-42842549118 INTERCHANGEABLE
Transistor
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5935-00-721-25584397 INTERCHANGEABLE
Connector,plug,electrical
Souriau Usa, Inc. Dba Souriau Usa Inc
5330-01-188-92754397 INTERCHANGEABLE
Seal
Wilshire Corp
6130-01-463-11234397 INTERCHANGEABLE
Power Supply
Telcor Instruments Inc
7690-01-523-22344397 INTERCHANGEABLE
Marker,identification
Electromark
Cross-Reference Index
Part NumberManufacturer
653-1073-000 Ncr Corp Power Systems Div (USA)
4397 Precision Electronics, Inc (USA)
661820 PRIMARY Lockheed Martin Corporation Div Rms - Mitchel Field (USA)
W1637 Cen Electronics a Div of Chloride Power Electronics Inc (USA)
Related Parts
5920-00-142-7458INTERCHANGEABLE
FUSEHOLDER,BLOCK
4397
5961-00-572-4284INTERCHANGEABLE
TRANSISTOR
2549118
5935-00-721-2558INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
4397
5330-01-188-9275INTERCHANGEABLE
SEAL
4397
6130-01-463-1123INTERCHANGEABLE
POWER SUPPLY
4397
7690-01-523-2234INTERCHANGEABLE
MARKER,IDENTIFICATION
4397

Frequently Asked Questions

What is NSN 5950-00-487-7913?

NSN 5950-00-487-7913 is a Reactor, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-00-487-7913?

NSN 5950-00-487-7913 has 4 cross-referenced part numbers: 653-1073-000 (Ncr Corp Power Systems Div), 4397 (Precision Electronics, Inc), 661820 (Lockheed Martin Corporation Div Rms - Mitchel Field), W1637 (Cen Electronics a Div of Chloride Power Electronics Inc).

What NSN replaces 5950-00-487-7913?

There are 6 known substitutes for 5950-00-487-7913: 5920-00-142-7458, 5961-00-572-4284, 5935-00-721-2558 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 661820?

Key specifications for 661820: Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP; Body Length: 1.938 INCHES NOMINAL IN; Distance Between Mounting Facility Centers: 1.343 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Terminal Type and Quantity: 3 WIRE HOOK. 20 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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