Alliant Castings is a manufacturer of cast products delivered with speed. We serve our employees, customers, suppliers and community by safely manufacturing quality products and services through:

Engaged & Skilled Employees

Applying Innovative Technologies

Continuous Improvement

Sustainability & Growth

Custom Solutions For Challenging Castings

Alliant Castings manufactures alloyed iron castings. Applying the latest technologies, we produce castings to meet our clients’ most demanding specifications. With over 125 years’ experience in alloyed iron parts, we take pride in delivering intelligent solutions at a competitive price, with shorter lead times and exceptional customer service.

A Proud History

Founded in 1885 as Diamond Huller, our company has served American industry for over 100 years. While we have constantly updated our technologies to meet the demands of a growing economy, we have always remained faithful to our Midwestern roots and the core values of service, craftsmanship, hard work and integrity. Our recent investments in state-of-the-art technologies and updated management systems are preparing us for new challenges, as we look forward to another century of productive service.

Tom Renk - Alliant Castings

CleanCasting – Our Commitment To Sustainability

As an industry born in the 1800s, metal casting has acquired a reputation as a “dirty” industry, characterized by waste and pollution. Alliant Castings has embraced the best values of the 21st century, including a serious commitment to environmental stewardship.

A partnership with US Compliance ensures conformance to safety and environmental regulations. Learn more at

The use of advanced technologies combined with effective management strategies has transformed our plant into one of America’s cleanest metal casting operations.

A Tradition of Quality

The Sioux Indian Nation occupied the Mississippi River Valley in 1885, the year Alliant Castings began as Diamond Huller to manufacture feed grinders and corn shellers for the escalating agricultural industry of the Upper Midwest.

100 years later, our focus is on the manufacturing of alloyed iron castings for worldwide distribution.

Our dedication to continuous updates in casting technology, alloys, and equipment allows us to deliver the highest quality castings our industry can provide.

Because of our adherence to a pristine work ethic, Alliant customers are assured of efficient service and value second to none.

Diamond Ball Beating Attrition Mill

Community Matters

Alliant Castings is committed to supporting and enriching the local community. We express that commitment practically, by providing educational opportunities for young people seeking to advance themselves by enhance their skills in mathematics, communication and personal development.

We are also contributing to the business community as active participants in:

  • Winona Cotter Centennial Campaign
  • Winona Chamber of Commerce
  • Morrie Miller Athletic Foundation
  • Winona Area Catholic Schools
  • Winona Senior High Touchdown Club
  • Rollingstone Community School
  • Special Olympics of Minnesota
  • Special Athletic Competition – Winona
  • Winona Volunteer Services – 10 Days of Giving
  • Southeast Technical College
  • Wounded Warrior Project
  • Winona Cotter Band
  • Winona Cotter Athletic Booster
  • Manufacturing Day Host

Delivery Precision

Alliant Castings understands the pressure of time that customers face as they compete in the global marketplace. Our new investments in plant technology have been largely focused on shrinking lead times. Combined with our application of lean manufacturing, the result is a track record of fast delivery. Today, in fact, our castings often arrive ahead of schedule or within our customer’s delivery window. When you request a casting from Alliant Castings, you can be certain that your timeframes are our priority.

Historical Photos