The 0.250" (6.35mm) pitch and matching row spacing give you room to route traces and accommodate larger-gauge wiring in the mating receptacle — a practical choice when you need a rugged, field-serviceable interconnect for general-purpose equipment.
Pitch, plating, and mating cycle trade-offs
The 6.35mm pitch is generous — compare it to the 2.00mm pitch on TE's CT series header 1-292164-1, which packs 11 positions into a single row but demands finer PCB routing and smaller wire. The wider pitch here means you can use standard 0.250"-spaced receptacles without a magnifier. For a connector that gets disconnected once or twice in its service life, tin is fine. For frequent field swap-outs, gold is the better call.