5179031-1 is a fine pitch SMT stacking plug connector designed for parallel board-to-board applications. This 40-position connector features a 0.8mm contact pitch and supports 8mm stacking height when mated with compatible receptacles. Key dimensions include A: 15.20mm, B: 21.80mm, and C: 20.20mm, with 8µ" gold plating for reliable electrical contact. The connector utilizes surface mount technology with recommended PC board layout specifications including 1.2±0.03mm and 0.8±0.03mm diameter mounting holes. Ideal for compact electronic assemblies requiring reliable parallel board-to-board interconnections in space-constrained applications.