Grayhill, Inc. was founded in 1943 and is headquartered in La Grange, Illinois, USA. The company specializes in designing and manufacturing intuitive human-machine interface solutions and high-reliability electromechanical components. Its core product lines include optical and mechanical encoders, rotary switches, joysticks, surface-mount and thru-hole DIP switches, toggle switches, custom keypads, and front panel operator interfaces. Notable series include the Series 62 and 63 optical encoders, Series 09 and 19 rotary switches, and Series 76 and 78 DIP switches. Grayhill also produces I/O modules, mounting racks, and customized control systems for demanding applications. The company serves critical markets such as medical devices, industrial automation, military and aerospace, off-highway vehicles, and transportation. Grayhill is recognized as a global leader in precision rotary switches and encoders, renowned for ruggedness, long cycle life, and sealed, weather-resistant designs. It holds ISO 9001 and AS9100 certifications, underscoring its commitment to quality and aerospace-grade manufacturing. With extensive custom engineering capabilities, Grayhill partners closely with OEMs to deliver tailored interface solutions. Its products are distributed worldwide through direct sales and a global network of distributors.