PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4121Transformer,power

Spang & Company Dba Magnetics Division · NSN 5950-00-219-8681 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-219-8681 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-219-8681. Primary manufacturer part number: 4121.
Features
  • Transformer,power — FSC 5950
  • Body Height: 3.781 INCHES NOMINAL IN
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
  • Inclosure Type: HERMETICALLY SEALED
  • Reliability Indicator: NOT ESTABLISHED
  • Center to Center Distance Between Mounting Facilities Parallel to Width: 1.859 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Mounting Method: THREADED STUD(S) SINGLE GROUP
  • Body Width: 2.5715 INCHES NOMINAL IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-00-219-8681, 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 Spang & Company Dba Magnetics Division. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, 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
NSN5950-00-219-8681
Primary Part Number4121
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerSpang & Company Dba Magnetics Division
StatusCANCELLED
Body Height3.781 INCHES NOMINAL IN
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Inclosure TypeHERMETICALLY SEALED
Reliability IndicatorNOT ESTABLISHED
Center to Center Distance Between Mounting Facilities Parallel to Width1.859 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Mounting MethodTHREADED STUD(S) SINGLE GROUP
Body Width2.5715 INCHES NOMINAL IN
Body Length3.000 INCHES NOMINAL IN
Terminal Type and Quantity9 EYELET
Nominal Thread Size0.164 INCHES SINGLE GROUP IN
Mounting Facility Quantity4 SINGLE GROUP
Winding Function and Quantity1 PRIMARY AND 3 SECONDARY SINGLE COMPONENT
Winding Operating Voltage120.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Center to Center Distance Between Mounting Facilities Parallel to Length2.297 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Frequency Rating400.0 HERTZ NOMINAL SINGLE COMPONENT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5935-00-067-0623412 INTERCHANGEABLE
Connector,plug,electrical
Pauluhn Electric Manufacturing, Llp Dba Pauluhn Electric
3120-00-339-3202 INTERCHANGEABLE
Bearing,sleeve
4320-00-353-5584 INTERCHANGEABLE
Impeller,pump,centrifugal
4730-00-478-2634D2446 45 ELBOW NPS 1/2 PVCI INTERCHANGEABLE
Elbow,pipe
American Society for Testing and Materials Dba Astm International
4320-00-542-3189 INTERCHANGEABLE
Ram,hydraulic
3417-00-548-3869 INTERCHANGEABLE
Type,copy
5342-00-689-7215412-1 INTERCHANGEABLE
Plug
Niagara Plastics L.l.c.
4210-00-806-6094 INTERCHANGEABLE
No Item Name Available
6625-00-899-806934605 INTERCHANGEABLE
Meter,special Scale
Cec Vibration Products, Llc Dba Cec Vibrations Products
5310-00-912-0466 INTERCHANGEABLE
Washer,lock
Cross-Reference Index
Part NumberManufacturer
E4121-001 Spang & Company Dba Magnetics Division (USA)
E4125-001 Spang & Company Dba Magnetics Division (USA)
4121 PRIMARY Spang & Company Dba Magnetics Division (USA)
Related Parts
5935-00-067-0623INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
412
3120-00-339-3202INTERCHANGEABLE
BEARING,SLEEVE
4320-00-353-5584INTERCHANGEABLE
IMPELLER,PUMP,CENTRIFUGAL
4730-00-478-2634INTERCHANGEABLE
ELBOW,PIPE
D2446 45 ELBOW NPS 1/2 PVCI
4320-00-542-3189INTERCHANGEABLE
RAM,HYDRAULIC
3417-00-548-3869INTERCHANGEABLE
TYPE,COPY
5342-00-689-7215INTERCHANGEABLE
PLUG
412-1
4210-00-806-6094INTERCHANGEABLE
NO ITEM NAME AVAILABLE
6625-00-899-8069INTERCHANGEABLE
METER,SPECIAL SCALE
34605
5310-00-912-0466INTERCHANGEABLE
WASHER,LOCK
5330-00-964-2788INTERCHANGEABLE
GASKET
4121
5305-01-054-2012INTERCHANGEABLE
SCREW,MACHINE

Frequently Asked Questions

What is NSN 5950-00-219-8681?

NSN 5950-00-219-8681 is a Transformer,power, manufactured by Spang & Company Dba Magnetics Division, classified under FSC 5950 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5950-00-219-8681?

NSN 5950-00-219-8681 has 3 cross-referenced part numbers: E4121-001 (Spang & Company Dba Magnetics Division), E4125-001 (Spang & Company Dba Magnetics Division), 4121 (Spang & Company Dba Magnetics Division).

What NSN replaces 5950-00-219-8681?

There are 12 known substitutes for 5950-00-219-8681: 5935-00-067-0623, 3120-00-339-3202, 4320-00-353-5584 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4121?

Key specifications for 4121: Body Height: 3.781 INCHES NOMINAL IN; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP; Inclosure Type: HERMETICALLY SEALED; Reliability Indicator: NOT ESTABLISHED. 16 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5950-00-219-8681 still in active supply?

NSN 5950-00-219-8681 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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