The 3.81 mm pitch and 5.08 mm row spacing match the Dynamic D-3100 pin header family, making this the wire-side half of a wire-to-board interconnect.
The 3.81 mm pitch and 5.08 mm row spacing are the dimensions that lock the board footprint. The 2-row layout gives a compact 3-by-2 arrangement, with each position accepting a separate crimp terminal.
The housing does not ship with contacts. The crimp termination gives a gas-tight connection suitable for production harness builds. The housing's free-hanging design means it terminates the wire harness side, not the board.