It uses the standard 0.100" (2.54mm) pitch on both the mating and row spacing, which keeps the footprint compatible with breadboard-style layouts and common perforated boards. The through-hole termination and 0.430" (10.92mm) mating pin length give it a solid mechanical anchor in the PCB, while the 0.200" (5.08mm) post length suits standard board thicknesses.
The 0.100" (2.54mm) pitch is the defining dimension for board layout — every via and trace route must align to that grid. The 30.0µin (0.76µm) gold or GXT™ plating on the mating surface is the contact finish that governs cycle life: at this thickness, the header can handle repeated mating and unmating without the contact resistance drift you'd see with tin plating in a low-insertion-force application.