It uses a 0.100" (2.54mm) pitch on both the pin-to-pin and row spacing, which matches the standard 0.100" grid for prototyping and production PCB layouts.
The key selection driver is the right-angle orientation — it frees board space in the Z-axis for enclosures with tight height budgets, but requires the mating receptacle to approach from the side rather than straight on. The 0.110" (2.79mm) post length is sized for standard 1.6mm PCBs; deeper boards may need a longer post variant from the same series.