800 932-5356

Rottler Manufacturing

Manufacturing Precision Machinery


Clarence T. Rottler founded Rottler Boring Bar Company in 1923 to service the automotive aftermarket. The first machine sale resulted from construction of a portable-type machine that Clarence demonstrated to automotive repair shops.


The early days, automobile repairs were required frequently. If an automobile traveled from Seattle to Portland and back, engine repairs were likely needed. In this climate the Rottler Boring Bar Company became increasingly prosperous through the roaring twenties.


Clarence T. Rottler died in 1956 and his son Don Rottler, already active in the company, assumed leadership.


Rottler’s original marketplace changed as the automotive repair shops relied more on larger facilities performing complete automotive engine remanufacturing more economically. Don Rottler saw opportunity in this market shift and steered the company towards producing equipment that was larger, more productive and easier to operate.


As Rottler Boring Bar Company expanded beyond portable boring bars the company name was changed to Rottler Manufacturing. Sales volume grew exponentially as new innovative products were added to the company’s catalog.


After two plant relocations, the company constructed a thirty-five-thousand square-foot manufacturing facility on a four and one-half acre site in Kent, Washington. The company is still at this location today and in 2011 added an additional 20,000 square feet to the plant.


In 1985 the company’s products changed from strictly mechanical controls to electro-mechanical systems that were soon coupled to micro-processors providing automated work cycles.


Beginning in 1997, Don’s son, Andy Rottler, took the helm. The new millennium has brought continued change to the market place. Rottler began designing new machines for the performance engine building and industrial engine remanufacturing industries. Pioneering mechanical and machine control design has been key to Rottler’s success in leading the engine building market. Equally important has been the increased effort in export sales. Rottler has increased export sales to more than 50% of its total product sales.



Machine Technology



Customer Tim Wilkerson Visit

NHRA Funny Car owner & driver stops by he plant during the western swing.