It uses the standard 0.100" (2.54mm) pitch that matches legacy board layouts and common IDC socket strips. At 100.0µin (2.54µm) on the mating side, the tin thickness is generous for a low-cycle internal connection — it will handle occasional rework but isn't specified for repeated field mating. The 110V voltage rating and UL94 V-0 housing suit it for equipment inside an enclosure where flame rating is required.
The 0.770" (19.56mm) mating pin length gives good wipe before the contact beams bottom out, and the 0.120" (3.05mm) solder tail suits standard 0.062" to 0.093" PCBs. Row spacing is also 0.100" (2.54mm), so the footprint is a 2x4 grid on 0.100" centers.