---- June 17th 2024 ----

Call: 1 (800) 377-3244
Monday to Friday 8 A.M. - 5 P.M. (Pacific Time)
E-mail questions to:

Pricing is subject to change depending on product availability and backorders.
*Please Note: Contact us for items without price.


EI Series

Stamped Transformer Lamination

CWS Bytemark stamped lamination are made of the highest quality of silicon steel available in the industry.
These lamination are used by engineers to design low frequency (50/60 Hz) transformers and inductors. Applications are in power supplies, electronics, transportation and communications.

Most of the popular sizes are available from stock in our warehouse in Orange, California and are available for immediate pick up or shipment.
Our pricing is the most competitive in the market now, and we offer you, our customers, good cost savings to make your product more competitive in the market without sacrifices in the level of quality.
The table below shows the sizes that are stocked. The quantities available show the actual quantity in stock and they changed every day as new shipment goes in and out of our warehouse.

*Please note that quantity is based on weight (pounds). Lamination is sold per pound. Contact us for pricing.
Other shapes and thickness are available as we do custom tooling. We can also do stacked lamination using progressive die and tooling.

The grain oriented steel which is M6 material is available in 29 gauge as standard thickness. The non grain oriented M19, and M50 are available in 29 and 26 gouge.

Useful Design Formulas
Bm = 3.489E x 106NfAcKs Gausses L = 3.192 x 10-8µ N2AcKs Henrys
E = 2.866 x 10-7 Bm N f Ac Ks volts N = 3.489 x 106Bm f Ac Ks turns
H = 0.4947 N I Oersteds µ = BH Gauss/Oersted

Ac = core cross section area (center leg width x stack heigh) inch2 Bm = maximum flux desnity, Gauss
= mean length of flux path, inch E = RMS sine wiave voltage of winding
f = sine wave frequency, Hertz H = magnetizing force, Oersted
Ks = lamination stacking factor (Ks x Ac = effective core area) L = inductance, Henry
I = current, ampere N = number of turns in winding
µ = permeability (CGS system), Gauss/Oersted

Silicon Steel Alloys
ASTM Thickness (mils) Description
M-6 0.014 Grain oriented 3.3% SiFe.
M-19 0.025 Non oriented silicon steels with 1.8 to 3.0% Si.
0.018 The fully processed grades have higher Si content and
M-22 0.025 are harder, Rb>75, after the final anneal. They are
0.018 available varnish coated. The semi processed grades
M-27 0.025 have a phosphate insulation, are always annealed after
0.018 stamping, yielding high permeability, and lower core loss
M-36 0.025 for a given silicon content. This table lists only the
0.018 semiprocessed grades.
Low Carbon Steel Alloys
ASTM Description
M-50 Low carbon steel insulated 0.025, 2.7-3.2W/#, 7VA#
M-55 Low carbon steel insulated 0.025, 3.7-4.2W/#, 7VA/#
M-56 Low carbon steel insulated 0.025, 4.3-4.8W/#, 8VA/#
M-65 Unannealed low carbon, 0.025, 6.5W/#, 15VA/#

CWS Bytemark 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 Bytemark 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 Bytemark highly recommend 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.

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 to

Any Comments, Suggestions or Questions? Contact us!
Tel: (714) 279-9010, Fax: (714) 279-9482
Toll Free: 1-800-679-3184 or 1 (800) 377-3244
CWS 353 West Grove Ave. Orange, California 92865

Copyright (C)2008-2021, CWS Bytemark
Updated 2021 Jan. Rev. V4.0