5177986-1 is a 40-position fine pitch SMT stacking plug connector designed for parallel board-to-board applications. It features a 0.8mm contact pitch with 8µ" gold plating for reliable electrical connections. The connector has dimensions of A: 15.20mm (.598"), B: 21.80mm (.858"), and C: 20.20mm (.795"), with a 5.0mm stacking height capability. The SMT design includes recommended PC board layout specifications with 1.2±0.03mm and 0.8±0.03mm diameter mounting holes. This connector is ideal for high-density electronic assemblies requiring compact, reliable board-to-board interconnections in consumer electronics, telecommunications, and industrial applications.