The 2842139-5: Dual-row layout with 10 positions loaded all; row spacing is also 2.00 mm, giving a compact 2×5 grid that fits tight board real estate. Unshrouded breakaway design means you can snap the header to shorter lengths if the BOM calls for fewer positions, though this part ships as a 10-position stick.
Mating contact finish is 15.0 µinch gold over copper alloy. In a board-to-board application cycled a few times a year, that gold layer gives decades of reliable contact resistance. Post finish is tin — the solder tail wets well during wave or hand solder, and the tin thickness of 78.7 µinch provides a robust joint without gold embrittlement risk.
Through-hole solder termination suits wave-solder assembly. The 0.110" post length gives enough stand-off for cleaning underneath, and the 0.327" overall contact length fits standard board-to-board spacing.