Power Transmission Supplies & Service

At the Donald E. Harman Company, we know manufacturing equipment. For five decades, we have provided the products, value engineering and support to get your equipment back up and running. With our large inventory centrally located in the Dallas-Fort Worth area, we provide high-quality components to manufacturers in a wide variety of industries.


our services

Custom Builds

Looking for something for your needs? We’ve got the expertise to design and build. We built this dynamometer with wichita brakes.

learn about Custom Builds


Have an application that needs to be reevaluated? We can help with it. Whether you need more output, have safety concerns, models are outdated or parts are difficult to come across. We can engineer a solution that fits your needs.

learn about Retrofitting

Brake and Clutch Repair

We have the facility, parts and equipment to repair brakes and clutches of any size. We can clean and replace worn components to quickly get you back up and running.

learn about Brake and Clutch Repair




Combination Clutch Brake Assembly

We built a custom combination Clutch Brake assembly that is driven by a electric motor through a planetary gear box.  Used on a Calender machine for rubber manufacturing to hold tension with fine adjustment in order to run material down to .012" thick.  We engineered a custom shaft, with a bearing carrier mounted to the sprocket and the brake drum, that drives the roll for rewinding, and holds the roll for unwinding.  We also engineered and installed a second Clutch-Brake Assembly…

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Dynamometer built in house

We built a Dynamometer to test gear boxes used in the atomic energy industry. 125 ft/lb test stand with a Himmelstein torque transducer for digital readout and Wichita brakes. (more…)

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Due to demand, we're updating our website with the ability to purchase some high volume products on our website. During the construction phase, the website or the e-commerce functions may not be operating properly. We apologize for any inconvenience. Please give us a call at 972-234-2021 if you run into any issues!

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Warehouse facility in Houston, TX

We've recently opened a warehouse in Houston, TX to better serve our south Texas customers. We understand that if your CNC machine is down or your unwind needs clutch or brake parts, you can't wait. The stock we hold is to serve our customers, give us a call and see how we can better assist you!

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The Harman Company launches their new website!

It hopes of reaching more customers and providing resources for our current customers, we've published a new website! Tell us what you think!

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