The HD36-18-21PN-059 is a plug connector from the HD30 series designed for industrial and commercial transportation applications requiring environmentally sealed connections. It features a 21-way cavity configuration with size 20 contacts and N-seal environmental protection to ensure reliable performance in harsh conditions. The connector includes an integrated cable clamp (indicated by the -059 suffix) for secure cable strain relief and simplified installation. The HD30 series is engineered for robust electrical connectivity in automotive and industrial environments where sealed, multi-cavity connections are essential. This plug connector is commonly used in vehicle wiring harnesses, engine control modules, and other transportation systems requiring durable, sealed multi-pin connections.