BBS series board to board through hole stacking terminal strips with a 2.54mm pitch. These board to board PCB header terminal strips are single row and have a standard profile. The body of the BBS series board-to-board PCB header terminal strip is made from black glass filled polyester and the contacts are made from phosphor bronze with a 0.51μm gold plating and brass outer shell. The temperature range at which these board to board stacking header terminal strips can be used is -55 to +125°C.
Part numbers BBS-XXX-X-A have a 5.33mm pin shoulder height
Part numbers BBS-XXX-X-B have a 8.51mm pin shoulder height

These BBL series board-to-board stacking header strips mate with the following:
SL series low profile socket strips: see stock number 767-9329 typically.
SS series socket strips: see stock number 767-9707 typically.

2.54mm Board to Board and Wire to Board - Samtec