Precision extrusion blow molds. Nearly 40 years in the making.

Herman Mold + Tooling is a local, Fairfield, Iowa, company that manufactures high-quality aluminum molds used to make plastic products. For 39 years, we have leveraged precision engineering and custom tooling to manufacture extrusion blow molds, enabling our partners to produce high-performance hollow products. Ranging from complex automotive reservoirs to heavy-duty industrial containers. Our molds serve a variety of diverse industries, including traffic safety, construction, agriculture equipment, automotive, and lawn and garden. Contact us today to discuss your custom tooling needs and see how our precision engineering can bring your next project to life.
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A person standing on platform of large horizontal milling machine.

Discover the art of precision mold making at Herman Mold + Tooling. Custom extrusion blow molds for plastic products.

From initial mold design through construction and special machining, we handle the full lifecycle of your tool in-house. Our team combines precision CNC machining with hands-on mold-making expertise to hold tight tolerances and deliver molds that run clean from the first shot. Whether you need a new mold built from the ground up or a revision or repair on an aging tool, we bring the same level of craftsmanship that's kept manufacturers in automotive, consumer, agriculture, construction, and lawn & garden coming back since 1987.

"The in-mold cutting and punching are working very well, and everyone is impressed with the design and prompt delivery of the mold."

a recent herman mold + Tooling, inc. customer review

Image of garden pot blow mold mounted onto CNC machine for finishing cutter paths.

Precision by design.

Every extrusion blow mold starts with 3D CAD design and engineering review, so we can catch issues before they hit the shop floor. We build custom tooling in single-cavity, multi-cavity, and family mold configurations — from 12 inches to 156 inches — for parts across automotive, agriculture, construction, and lawn & garden.

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Built to run.

Our shop runs on 5-axis and 3-axis CNC mills, lathes, and gun drills to hold tight tolerances on every mold we build. Each extrusion blow mold is water- and hydraulic-tested before delivery, so your production line keeps running the moment it arrives.

Our story

A red Polaris utility task vehicle (UTV) in the mountains.

A CNC machinist sitting in front of machine holding controls programming machine to create tooling.

Craftsmanship since 1987.

Our team of machinists and mold makers has delivered more than 9,100 extrusion blow molds worldwide, combining hands-on craftsmanship with modern CNC technology. We're always looking for skilled hands to join our shop floor.

Join our team

“The communication and mold development skills of Herman Mold + Tooling makes our mass production consistently high quality.”

– Kenji Kimura, YASUFUKU., U.S.A. Inc.

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October 8, 2026

Common Extrusion Blow Molded Products: What They Are and Where You'll Find Them

From fuel tanks to watering cans, extrusion blow molded parts are all around us.