The Tape Wound Core Specialists
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Standard & Custom Tape Wound Soft Magnetic Cores

As an industry leader in the design and manufacturing of tape wound soft magnetic cores, at MK Magnetics, Inc. we are in a unique position to identify industry trends and changing customer needs. Early on in our history, we recognized a deficiency within the industry for custom manufactured tape wound soft magnetic cores. Although our lines of standard products are extensive, the increasing shift towards custom designs was an area of that required a solution. To accomplish this, MK Magnetics assembled a team of highly experienced tape wound core veterans with the goal of augmenting standard cores with highly customizable products. Superior Engineering and Customer Service Support are an inherent part of this process which allows MK Magnetics to manufacture cores that provide maximum performance. From innovative engineering to cutting edge materials such as nanocrystalline, various amorphous materials, 3% grain-oriented and 6.5% non-oriented silicon steel, 50% and 80% nickel materials, Supermendur, and many other highly specialized materials.

Another key advantage of this service is the flexibility of MK Magnetics manufacturing capabilities. Within our facility, we can build cores weighing from .002 up to 4,000 lbs. +, and in dimensions up to 7.5’ in height by 4’ in width, depending on overall geometry. They can be configured as C, E, and pie type D-cores, cased and uncased toroid, bars, and a variety of custom shapes. We also have the flexibility and expertise to develop custom processes to accommodate virtually any core design with no restriction on volume. This is comprehensive offering and is backed up by a robust quality program and a full range of in-house testing capabilities, providing compliance with various industrial standards. MK can typically begin delivering in 3-5 weeks with expedited deliveries available.

For more information, please see the table below or contact us directly.

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Standard & Custom Tape Wound Soft Magnetic Core Capabilities

Rapid Prototyping
Custom Cores
Custom Processes
Multiple Cut Cores
Engineering Support
Design Support
Rapid Quoting
Test Lab
70,000 sq. ft. Campus
Stocking Programs
  • JIT
Custom & Standard Core Configurations
Tape Wound Cores / Cut Cores
  • C-Cores
  • E-Cores
  • Uncased Toroids including: Epoxy Coated, Cut in Half, Gapped, etc.
  • Cased Toroids including: Machined Nylon, Injection Molded, Aluminum, etc.
  • Pie Type 3-phase Cores, D-Cores
  • Bars
  • Other Custom Shapes
  • Other Special Configurations Available
Tape Cores
Tape Wound Cores
C-Cores (Single Phase)
E-Cores (3-Phase)
Cased Toroid
Gapped Toroid
Stacked Assemblies
Custom Cores
Custom Assemblies
Multiple Cut Cores
Epoxy Coated Cores
Optifficient Cores
Small to Very Large
Weights from .002 to 4,000 lbs.
Sizes up to 7.5' tall and 3' wide
Single piece production to 1M+
  • Nanocrystalline
    • Prime DFARS Compliant, Finemet FT3, Vitroperm800
    • Metglas® Inc. Finemet® FT-3W 5.6” wide,  DFARS Compliant US Manufactured
    • DFARS (Defense Acquisition Regulations System)
  • Amorphous Materials
    • Metglas® 2605SA1 Material
    • Industry Standard Series
    • Optifficient Core Series: Ultra-Low Loss Amorphous Cores
  • 2714 Cobalt-Based Amorphous
  • 3% Grain-Oriented Silicon Steel Materials (GOS)
    • High Flux (17.6 KG)
    • Standard Flux (15.0 KG)
  • 80% Nickel Materials
    • Supermalloy
    • Permalloy
    • Square Permalloy
  • 50% Nickel Materials
    • Square Loop
    • Round Loop 4750
  • Supermendur®, Cobalt-Iron High Flux Materials
  • 6.5% Non-Oriented Silicon Steel Materials
  • Other Specialized Materials

Metglas Finemet FT3-W is a registered trademark of Metglas Inc.
Finemet FT3 is a registered trademark of Hitachi Metals.
Metglas 2605SA1 is a registered trademark of Metglas Inc.
Common Mode Chokes
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Production Volume
Prototyping to Production
Low Volume
High Volume
*No minimum Order
MK can typically begin delivering in 3-5 weeks with expedited deliveries available.
Markets Served
Medical Devices
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Industry Standards
ANSI (compliant)
ASTM (compliant)
ISO 9001:2015
Mil-Spec (compliant)
EIA Standard RS-217
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