Welcome to Supreme Cores, Inc.

Supreme Cores, Inc., supplies sand cores and molds to the Foundry Industry. For over 30 years, we've provided a “Supreme” experience with all-inclusive pricing, just-in-time cores, and fast service.

  • Quality is our Priority

    Our quality lab is responsible for making sure our facility is running within the set parameters on a daily basis.  The lab is equipped to perform Loss on Ignition (LOI) , mold strength and surface hardness tests.  The results of these tests can be sent to you weekly in the form of an excel … [Continue Reading]

    Quality is our Priority
  • About Us

    Supreme Cores, Inc. is one of the countries original “core shops” started in 1978 in Janesville, Wisconsin by Warren Grossmann. We are now in our 34th year serving as a “Friend to the Foundry Industry”. Over the years, we have evolved into the “Supreme” leader of supplying cores and molds to the … [Continue Reading]

    About Us
  • Mission Statement

    Supreme Cores is committed to working with our customers to provide cores/molds at a mutually agreed upon price with on-time delivery, at a level of service and quality that enhances the customers ability to sell the highest quality castings. Our customers appreciate the “Supreme” experience and … [Continue Reading]

    Mission Statement
  • Get a Quote Today!

    Supreme Cores would like to hear from you. If you have a question or you'd like to place an order, give us a call 414-353-7100 or visit our contact page to send an email. Orders can be placed by fax, email, or through the website. … [Continue Reading]

    Get a Quote Today!