Specialized Electrical & Motorized Services

Herold & Mielenz is an innovative electric motor and power transmission sales and service center. We offer the following services to manufacturing, industry, agricultural, and commerce operations throughout Northern California and beyond:


Electric Motors

We stock vertical Hollow Shaft Pump, Compressor Duty, Brake, Washdown Duty, HVAC Fan and Blower, Pool and Spa, IEEE841, Crusher Duty, Stainless Steel, Inverter Duty, TEFC, ODP, Gearmotor, Grinder, Woodworking, Pressure Washer, Close-Coupled Pump, Explosion-Proof, Jet Pump, Farm Duty, and Servo Motor in Single Phase, Three Phase, and DC.

Motor Rewind/Repair

We repair and rewind all sizes and types of electric motors, always following the best practices of the Electrical Apparatus Service Association, Inc. (EASA) to maintain reliability and efficiency at, or above, the original manufacturer's specifications. We have an in-house vacuum pressure impregnation equipment and balancing, as well as machine work facilities.

Industrial Pumps

We have the best pumps at the best price, including submersible, centrifugal, booster, vertical turbine, multi-stage, as well as hot water circulating pumps. We also stock industrial water, sewer, and wastewater pumps. Our vendors include the most respected names in the business, such as Bell & Gosset, Goulds Pumps, Little Giant, and Sta-Rite.

Industrial Controls

Herold & Mielenz is Northern California's electrical automation and controls supply specialist. We stock DC and AC controls through 200 HP, and our vast inventory includes pushbutton controls, electronic soft starters, AC and DC contactors and overloads, both open and closed.

Mechanical Drives

We stock helical, parallel shaft, right angle, and cycloidal gearboxes in a variety of materials, includingcast iron, aluminum, and stainless steel. We also offer units that are suitable for washdown environments. Our vendors include such respected names as Baldor, Grove, Hub City, Lesson, Nord, and Sterling Electric.

Electronic Drives

At Herold & Mielenz, we stock AC invertor drives, vector drives, SCR drives, DC drives, as well as AC and DC servo controls from the top names in the business, including Baldor, Delta, WEG, Yaskawa, AC Tech, KB Electronics, Nord, Regal-Beloit, Saftronics, Bardac, Leeson, and AO Smith.

Dynamic Balancing

Equipment downtime and poor reliability can severely affect production and your company's profitability. Herold & Mielenz takes great care in providing dynamic balancing services that improve the availability and reliability of your critical rotating machinery.

Hard Facing

Hardfacing is a low cost method of depositing wear resistant surfaces on metal components to extend service life. Although the process is used primarily to restore worn parts to usable condition, hardfacing can also applied to new components before being placed into service to extend their serviceable life.


For more information about our services, or to speak with one of our experts, please call Herold & Mielenz at 916-422-7493.

Herold & Mielenz Mechanical Staff