Please use side menu if you cannot use dropdown boxes, or the header boxes
CAGE Code: 5DME2
ITAR Registration Code: M28889

- November 22nd 2017 -
Call: 1 (800) 377-3244
We Are Open Monday-Friday 8 am - 5 pm PT

  • Careers
  • MK Series
    High Inductance

    Mega Flux Cores used.
    Capable of handling very high DC bias current with minimal inductance roll off.
    Through hole mount with pre-tinned leads that can be directly soldered to PCB
    Normally our customer specify the specs ( size, inductance, current)and we build to meet the specs.
    Inductance range from: 13 uH to 600 uH
    Current range to 8.0 Amps to 80.0 Amps
    Also available in MPP, Sendust/KoolMu cores upon request.

    MK Series Mega Flux Toroidal Power Inductors.
    Through Hole Mounting Construction

    • Designed using high saturation and high temperature stability "Mega Flux Cores" with distributed air-gap
    • Excellent electromagnetic shielding due to toroidal design
    • Designed for commercial, industrial and military application
    • Low cost designs with pre-tinned leads for PCB through hole mounting
    • Inductance values from 13 uH to 600 uH
    • Current rating from 8 Amps to 80 Amps
    • Temperature Rating: -55 deg C to +125 Deg C
    • Potted version available for military application
    • Custom designs are available to meet your specific requirements

    Click the button to see examples of our custom wound products. We wind anything to meet your needs.

    1) No tooling or set up fees required for standard parts
    2) FREE Samples available for large OEMs
    3) Typical Delivery: 4 to 6 weeks

    ) The prices shown below are for low volume quantity. Please call 800-377-3244 or
    email for larger volume OEM pricing.
    ) Our large OEM pricing is extremely competitive. We will meet or beat any competitors prices with better deliveries
    ) Custom designs are available to meet any of your requirements. Please contact us
    ) The data shown below can be sorted by clicking each column header.Click once again to sort in reverse order.
    5) "Inductance at 1 Khz" ( 2nd column from left in table below ) is the inductance measured at zero or very low DC bias current.
    6) "Current Rating" ( 3rd column from left in table below ) is based on a 40 deg C temperature rise at an ambient temperature of 90 deg C. This is the DC bias current through the inductor that will cause the inductor will reach a max. temp. rise of 40 deg C. above ambient with NO AIR FLOW.
    7) "Incremental Current for 20% inductance drop" ( 4th column from left in table below ) is the DC bias current that will cause the inductance to drop by 20% from the value shown in Inductance at 1 Khz. At this current, the temperature rise may be above the 40 deg C stated above, so forced air flow may be required.
    8) The saturation current is at least 5 times the max current listed in 5) or 6) above, so instantaneous high current spikes can be tolerated by these inductors.
    9) "Dimensions:"

    • A = Outer Dimension
    • B = Height
    • C = Vertical Mounting Hole Distance
    • D = Lead length
    • E = Lead Width
    • F = Horizontal Mounting Hole Distance

      Part Number Inductance Current
    Rated Current
    A / B / C
    In Inches
      CWS-1MF-11805 95.00 uH 25 Amps 79.0 uH 12.0 mΩ 5.3 MHz 2.05 / 1.42 / 0.50 $40.00
    Buy Now
      CWS-1MF-12420 83.00 uH 100 Amps 63 uH 3.0 mΩ 2.3 MHz 2.76/3.50/6.30 $235.00
    Buy Now
      MK5712-620M-65AH 62.00 uH 65 Amps 52.5 uH 2.5 mΩ 6.5 MHz 2.77 / 1.93 / 1.00 $60.00
    Buy Now
      MK5712-162M-20AH 1.60 mH 20 Amps 880.0 uH 60.0 mΩ 350 kHz 2.68 / 1.87 / 0.75 $65.00
    Buy Now
      MK4672-122M-20AH 1.20 mH 20 Amps 700.0 uH 55.0 mΩ 465 kHz 2.26 / 2.00 / 0.75 $65.00
    Buy Now
      MK5713-102M-42AH 1.00 mH 42 Amps 510 uH 27.0 mΩ 630 KHz 2.89/3.11/2.56
    Buy Now

    Disclaimer: Coil Winding Specialist, Inc., its affiliates, agents, and employees acting on behalf of Coil Winding Specialist, Inc. (collectively, CWS) disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. CWS reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS highly recommends customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions. Customers using or selling CWS products for use in other than recommended applications do so entirely at their own risk and agree to fully indemnify CWS from any damages arising or resulting from such use or sale.

    WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go

    Any Comments, Suggestions or Questions? Contact us! Email:
    CWS 353 West Grove Ave. Orange, California 92865
    Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244

    Tel: (714) 279-9010, Fax: (714) 279-9482

    Copyright 2008, Coil Winding Specialist, Inc
    Updated July, 2013

    CAGE Code: 5DME2(Registered with