PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

37581Saturable Reactor

Freed Transformer Co · NSN 5950-00-446-0506 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-446-0506 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-446-0506. Primary manufacturer part number: 37581.
Features
  • Saturable Reactor — FSC 5950
  • Reliability Indicator: NOT ESTABLISHED
  • Inclosure Type: HERMETICALLY SEALED
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
  • Winding Operating Voltage: 115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
  • Mounting Method: THREADED HOLE(S) SINGLE GROUP
  • Terminal Type and Quantity: 6 TAB, SOLDER LUG
  • Nominal Thread Size: 0.164 INCHES SINGLE GROUP IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Saturable Reactor, cataloged under National Stock Number 5950-00-446-0506, 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 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 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
NSN5950-00-446-0506
Primary Part Number37581
Item NameSaturable Reactor
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerFreed Transformer Co
StatusCANCELLED
Reliability IndicatorNOT ESTABLISHED
Inclosure TypeHERMETICALLY SEALED
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Winding Operating Voltage115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Mounting MethodTHREADED HOLE(S) SINGLE GROUP
Terminal Type and Quantity6 TAB, SOLDER LUG
Nominal Thread Size0.164 INCHES SINGLE GROUP IN
DC Resistance Rating in Ohms10600.000 SINGLE COMPONENT SINGLE CONTROL
DC Resistance Rating in Ohms150.000 SINGLE COMPONENT SINGLE PRIMARY
Winding Function and Quantity1 PRIMARY AND 1 CONTROL SINGLE COMPONENT
Winding Power Rating10.0 WATTS SINGLE COMPONENT SINGLE PRIMARY
Mounting Facility Quantity4 SINGLE GROUP
Frequency Rating400.0 HERTZ NOMINAL SINGLE COMPONENT
Center to Center Distance Between Mounting Facilities Parallel to Width1.000 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
6685-00-085-2404 INTERCHANGEABLE
Detector,temperature
5330-00-141-419963X0150 INTERCHANGEABLE
Seal,plain Encased
Garlock Sealing Technologies Llc Dba Garlock Sealing Technologies Llc
1560-00-574-090817524 INTERCHANGEABLE
Link,engine Compart
Bokers Inc
6220-00-846-571015028 INTERCHANGEABLE
Spotlight
Unity Manufacturing Co
5962-01-010-8585 INTERCHANGEABLE
Microcircuit,digital
5950-01-095-6491986181-1B INTERCHANGEABLE
Reactor
Raytheon Company Dba Raytheon
5365-01-165-7471 INTERCHANGEABLE
Spacer
5950-01-188-830717524 INTERCHANGEABLE
Transformer,power
Astronautics Corporation of America
5365-01-229-9776 INTERCHANGEABLE
Spacer,ring
2940-01-328-5589770021752010 INTERCHANGEABLE
Filter Element,fluid
Deutz Corporation
Cross-Reference Index
Part NumberManufacturer
BC 1524 Pegasus Inc (USA)
674-5011-00 Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems (USA)
37581 PRIMARY Freed Transformer Co (USA)
17524 Freed Transformer Co (USA)
BC1524 Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems (USA)
Related Parts
6685-00-085-2404INTERCHANGEABLE
DETECTOR,TEMPERATURE
5330-00-141-4199INTERCHANGEABLE
SEAL,PLAIN ENCASED
63X0150
1560-00-574-0908INTERCHANGEABLE
LINK,ENGINE COMPART
17524
6220-00-846-5710INTERCHANGEABLE
SPOTLIGHT
15028
5962-01-010-8585INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
5950-01-095-6491INTERCHANGEABLE
REACTOR
986181-1B
5365-01-165-7471INTERCHANGEABLE
SPACER
5950-01-188-8307INTERCHANGEABLE
TRANSFORMER,POWER
17524
5365-01-229-9776INTERCHANGEABLE
SPACER,RING
2940-01-328-5589INTERCHANGEABLE
FILTER ELEMENT,FLUID
770021752010
5310-01-564-3419INTERCHANGEABLE
NUT,SELF-LOCKING,HEXAGON
37581
4320-01-732-8031INTERCHANGEABLE
PUMP,ROTARY
17524

Frequently Asked Questions

What is NSN 5950-00-446-0506?

NSN 5950-00-446-0506 is a Saturable Reactor, manufactured by Freed Transformer Co, classified under FSC 5950 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5950-00-446-0506?

NSN 5950-00-446-0506 has 5 cross-referenced part numbers: BC 1524 (Pegasus Inc), 674-5011-00 (Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems), 37581 (Freed Transformer Co), 17524 (Freed Transformer Co), BC1524 (Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems).

What NSN replaces 5950-00-446-0506?

There are 12 known substitutes for 5950-00-446-0506: 6685-00-085-2404, 5330-00-141-4199, 1560-00-574-0908 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 37581?

Key specifications for 37581: Reliability Indicator: NOT ESTABLISHED; Overall Length: 1.875 INCHES MAXIMUM IN; Inclosure Type: HERMETICALLY SEALED; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP. 17 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5950-00-446-0506 still in active supply?

NSN 5950-00-446-0506 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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