Corefficient Complete Core Solution

Energy Efficient Electrical Transformer Cores

Corefficient designs, manufactures and markets energy efficient electrical cores; a major component used in the manufacture of dry-type and liquid-filled transformers. Based out of Monterrey, Mexico, Corefficient is part of Kloeckner Metals.

Our state-of-the-art facility manufactures electrical core products that meet the current U.S. Department of energy efficiency regulations. Corefficient’s goal is to ensure the consistent delivery of exceptional service, and the company looks forward to building a new legacy of value to the core.

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The Corefficient Guarantee

  • We test all incoming material for quality first.
  • We test & inspect core loses, dimensionality, weight, and sound pollution.
  • We test wound cores before and after annealing.
  • We adhere to DOE, ASTM, and NRCAN regulations.
  • Compliant with ISO 9001:2015.

Electrical Transformer Cores in North America

Corefficient is proud to be a premier supplier of energy efficient electrical cores throughout the U.S., Canada, and Mexico.

If you’re in the market for innovative transformer core products to meet growing energy standards, we want to hear from you. Click the button below and let’s get started.

Corefficient-Complete Core Solution

  • In-line sequential cutting ensures uniform stacking
  • Reduce core loss variability
  • Tighter tolerances on core parameters result in better performance
  • Fully tested core losses
  • Transformer designer does not have to allow loss tolerance in their calculation

Products & Services


Transformer Core Manufacturing

Corefficient manufactures high quality Mitre Cut Cores and Distributed Gap Cores that meet critical efficiency regulations.


Extensive Annealing, Testing, & Finishing Capabilities

We have in-house annealing, testing and finishing equipment & personnel to ensure product performance and durability.

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Energy Efficiency

Corefficient’s quality transformer cores are specifically and carefully designed to meet stringent U.S. energy efficiency regulations.


We create a competitive advantage for customers by manufacturing energy efficient electrical cores that consistently meet quality, delivery, and value expectations.​

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Call: 800.233.1977