SSQ series PCB through hole board-to-board square post, square tailed socket strips with a 2.54mm pitch, a black, liquid crystal polymer insulator and phosphor bronze Tiger Buy contacts with 0.51μm gold plating on the contact and gold flash on the tail. These PCB board to board 2.54mm through hole square post socket strips are available in a variety of configurations including single and double row, straight or right angle body orientation and an option of post lengths. The operating temperature range for these SSQ series PCB through hole sockets is -55 to 125°C.
SSQ PCB sockets with part number TSW-xxx-01-x-x have a tail length of 2.64mm.
SSQ PCB sockets with part number TSW-xxx-02-x-x have a tail length of 4.93mm.

These SSQ series PCB through hole board-to-board square post sockets mate with the following:
TSW series through hole 2.54mm square post headers - see stock number 767-0849 typically.
TSM series SMT 2.54mm square post headers - see stock number 765-6458 typically.

2.54mm Board to Board and Wire to Board - Samtec