5176139-1 is a Standard Edge II card edge connector designed for edge card PCB applications with a special 18/31 dual combination configuration. The connector features 52 dual positions with a 2.54 mm (0.100 inch) centerline spacing and vertical PCB mounting orientation with solder post termination. The housing is constructed from polyester glass-filled material in black with UL 94V-0 flammability rating, and the contacts are gold-flashed phosphor bronze with nickel underplate for reliable mating and corrosion resistance. The connector is RoHS and ELV compliant, wave solder capable to 265°C, and features a termination post length of 3.18 mm (0.125 inch) with tin plating on the solder tail. This connector is ideal for industrial and computing applications requiring robust edge card interconnection with high current capability and long-term reliability.