The 1-1761681-1 is a vertical header assembly connector designed for printed circuit board interconnection applications. It features a 34-position configuration with phosphor bronze posts and a black PCT housing rated UL94V-0 for flame resistance. The posts are finished with a minimum of 0.00038 inches of gold on the mating area, 0.00254 inches of tin on the solder end, and 0.00127 inches of nickel overall, ensuring reliable electrical contact and solderability. The connector has a body length of 40.64 mm (1.600 inches) with a mating length of 48.26 mm (1.900 inches) and a maximum length of 50.80 mm (2.000 inches), with 2.54 mm (0.100 inch) pitch spacing between positions. This header assembly is commonly used in industrial control systems, telecommunications equipment, and computer peripherals where robust vertical interconnection and high contact reliability are required.