The M20-9983646 is a 72-contact 2.54mm male DIL Board-to-board Pin Header with 100% tin over nickel plated phosphor bronze contacts, 100% tin over nickel plated termination and black UL94V-0 polyamide (nylon) 6T housing. The M20 series connector has 3mm PC tail, vertical connector orientation and PC tail/through board connection type. It is suitable for use with 0.64mm square mating pin size. Suitable for interconnecting board to board.