The 174520-1 is a 4-circuit commercial Mate-N-Lok header assembly connector manufactured by TE Connectivity/AMP. It features pre-tinned copper alloy pins with a nickel and gold plating system (0.0013" nickel base with 0.00075" gold over contact length and matte tin on solder tail end), housed in a natural-colored nylon body. The connector has a pin retention strength of 6 lbs minimum and is designed for 1.55 mm thick PCB layouts with a recommended hole diameter of 1.778±0.075 mm. This connector is commonly used in commercial electronic applications requiring reliable board-to-board or wire-to-board interconnections with standardized Mate-N-Lok compatibility.