The 62D18-02-020C is a high-torque optical encoder from Grayhill's Series 62 line, featuring a 1/2" economical package with 16 detent positions (22.5° angle of throw) and an integral pushbutton switch. This encoder operates at 5.0 Vdc with 2-bit quadrature coded output, delivering a rotational life of 1,000,000 cycles minimum and a pushbutton life of 3 million actuations. Key specifications include an operating torque of 3.5 ±1.4 in-oz initially (high-torque Style D), maximum operating speed of 100 RPM, supply current of 30 mA maximum, and power consumption of 150 mW maximum. The device features optically coupled outputs compatible with CMOS, TTL, and HCMOS logic, with external pull-up resistors (2.2 kO) required for operation. Commonly used in global positioning systems, driver information systems, and medical equipment, this encoder provides reliable rotational feedback with long operational life and economical design.