AHDM04-18-20PN is a DuraMate™ AHDM Series circular connector plug manufactured by Amphenol Sine Systems for harsh-environment, off-road industrial applications. The connector features Shell Size 18 with 20 contact positions and integrates an environmentally-sealed design with a circular bayonet locking system or blind mate coupling option. It is constructed with metal (aluminum or zinc alloy) housing and supports multiple contact sizes (Size 4, 8, 12, 16, and 20) with corresponding current ratings ranging from 7.5A to 100A at 250V maximum voltage. The connector accommodates wire sizes from 4AWG down to 22AWG with normal, thin, or reduced diameter seals depending on application requirements. This connector is widely used in agricultural equipment (ISOBUS 91 Series compatible), heavy machinery, and industrial control systems where reliable, sealed connections are essential in demanding outdoor and off-road environments.