40 PIN ANGLE SINGLE ROW PIN HEADER A 40 pin header (or simply header) is a form of electrical connector, often associated with ribbon cable connector. It consists of one or more rows of pins typically spaced 0.1 inches (2.54 mm) apart, but sometimes 2mm (0.079 in) or 0.05 inches (1.27 mm) is used as well FEATURES OF 40 PIN ANGLE SINGLE ROW PIN HEADER: Easy to interface I/O peripherals with microcontroller. APPLICATIONS OF 40 PIN ANGLE SINGLE ROW PIN HEADER: DIY projects. LCD interfacing. Keypad interfacing. And many more.