The 62S18-H9-020CH is a compact optical encoder from Grayhill's Series 62S line, designed for applications requiring minimal behind-panel space in a 1/2" package format. This encoder features a 3/8-32 UNEF-2A threaded shaft interface and supports multiple termination options including cable connections with AMP connectors (P/N 215083-6 or equivalent). The device is rated for 1 million rotational cycles under low and medium torque conditions, with 3 million rotations available for non-detent styles, and operates reliably across a temperature range of -40°C to +85°C. Key dimensional specifications include a shaft diameter of 0.219±0.003 inches (5.56±0.07 mm) and overall package dimensions of approximately 0.687±0.015 inches (17.45±0.38 mm) in length. This encoder is well-suited for global positioning systems, driver information systems, and medical equipment applications where compact size and reliable rotational sensing are essential.