What this connector is
The Amphenol FCI BERGSTIK II 87185-434HLF is a 34-position unshrouded square-pin male header built for board-to-board interconnect at 0.100 inch (2.54 mm) pitch. Single-row through-hole termination with push-pull fastening; the insulator is black UL94 V-0 rated and the contacts are tin-plated phosphor bronze on both the mating face and the solder tail. Contact Finish Thickness at the mating interface is 100.0 µin (2.54 µm) tin.
