BCS series board to board PCB through hole mount standard box connector socket strip with a 2.54mm pitch, a single row configuration and choice of top or horizontal entry body orientation. The body of these BCS series 2.54mm PCB board-to-board box connector socket strips is made from black liquid crystal polymer and the contacts are made from phosphor bronze with a 0.25μm gold plating on the contact and matte tin on the tail. The temperature range at which these BCS board to board box connector socket strips can be used is -55 to +125°C.
Part numbers BCS-XXX-X HE are single row, horizontal entry.
Part numbers BCS-XXX-X TE are single row, top entry.

These BCS series board to board box connector sockets will mate with the following:
TSW series through hole square post headers - stock number 767-0877 typically.
TSM series SMT square post headers - stock number 765-6489 typically.
DW series flexible square board stackers - 277-9720 typically.
EW series flexible square board stackers - 277-9742 typically.

2.54mm Board to Board and Wire to Board - Samtec