Board footprint and mating match
The 350712-4: The 0.250" (6.35mm) pitch and matching row spacing set the PCB layout — the same spacing as the Universal MATE-N-LOK receptacle family, so this header mates directly with standard pin contacts in that series. 9 positions loaded across 3 rows, all contacts populated — no empty cavities to account for in the harness design.
The post finish is tin, which solders cleanly into the through-hole board — the gold-to-tin interface at the contact beam is avoided by keeping gold only on the mating side.