The 2-87589-1: The 4-wall shrouding protects the pins during handling and guides the mating half into alignment – useful in board-to-board or cable-to-board applications where mis-mate risk is high.
Tin-Lead Plating Across the Board
That's a heavy coating – good for corrosion resistance in moderate environments, but note it is not RoHS-compliant if your BOM requires it. The contact material is Phosphor Bronze, a standard spring alloy that holds up to repeated mating cycles within the rated 3A per contact current limit.
Mating and Termination Checklist
The detent lock on the header engages with the corresponding latch on the receptacle side – no additional hardware needed. Termination is through-hole solder. The post length is 0.125" (3.18mm) – check your board thickness and solder fillet requirements against that dimension.