Female DEC Connector, 9pin 15pin 25pin 37Pin Straight PCB D-SUB Connector

D-type connectors most commonly consist of two and sometimes more parallel rows of connections. The connectors feature a D-format metal shell that provides mechanical strength and limited screening capabilities. The metal shells of the plug and socket make contact to enhance screening effectiveness.

Panel mounting connectors are typically secured using nuts with additional threading that allows mating connectors to be secured, preventing them from working loose. Free connectors can be equipped with backshells that provide screening and cable screen connection, or plastic backshells that offer protection and strain relief.

For common connector types with two rows of pins (9, 15, 25 and 37 way), pins are spaced approximately 0.108 inch (2.74 mm) apart with rows spaced 0.112 inch (2.84 mm) apart. Higher pin counts and densities can be achieved using additional rows of pins.