---- July 23rd 2024 ----

CAGE Code: 5DME2
ITAR Registration Code: M28889
Call: 1 (800) 377-3244
Monday to Friday 8 A.M. - 5 P.M. (Pacific Time)
E-mail questions and requirements to: sales@coilws.com

Pricing is subject to change depending on product availability and backorders.
*Please Note: Items without price are listed for CWS' capability purposes.

Air Coil Inductors

Air Coil Inductors
Using Any Wire Gauges (Up to AWG #8)

CWS manufactures all types of air coils inductors, from round diameter wires in AWG #36 to AWG#8, and rectangular sizes of 72 mils x 182 mils and 95 mils x 182 mils. In many cases, the windings are done using 200 deg C class wire insulation for high temperature application.

Single layer air coil windings formula and the Q factor can be downloaded from the following .PDF file


This formula in the above .PDF file is most accurate when the coil length is greater than 0.67 of the radius and the frequency is less than 10 Mhz. As the frequency goes above 10 Mhz, parasitic capacitance causes the formula to be less accurate.

Q changes drastically as a function of frequency. At lower frequency, Q is good as only the DC resistance has an effect. As the frequency increase, Q will increase up to a point when the skin effects and the distributed capacitance begin to dominate. Then, Q will decrease till it reached zero at self resonance frequency.

Q can be increase by decreasing the windings resistance ( using heavy gauge wires), spread the windings to lower distributed capacitance and using a iron or ferrite core to wind over to increase the inductance.

An Air Coil Winding chart can be downloaded from the .PDF file below. This chart shows the air coil inductances with various number of turns, diameter and length.


See below for examples of custom coil windings. Please call CWS for your requirements - high quality work at a reasonable tooling cost and low cost volume production.




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 towww.P65Warnings.ca.gov.

Any Comments, Suggestions or Questions? Contact us!
Email: sales@coilws.com
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 www.ccr.gov)