The PK156-D is a polarizing key component for the MAS-CON Series 156 connector system, designed to ensure correct mating orientation and prevent incorrect connector insertion. Manufactured from PA6/6 (UL94 V-0) flame-retardant material, this polarizing key provides reliable mechanical guidance and electrical safety in connector assemblies. The component features dimensional specifications of 31.50 mm length, 25.60 mm width, and 8.00 mm height, with a 1.55 mm feature dimension. This polarizing key is commonly used in industrial control systems, telecommunications equipment, and automated machinery where connector reliability and correct orientation are critical to system performance and safety.