Precision Screw Machined 2.54mm Terminal Strips - TD Series TD series board to board through hole double row precision screw machined terminal header strips with a 2.54mm pitch and a 3.96mm tail length. The body of these TD series board-to-board PCB precision machined header terminals is made from black glass filled polyester and the contacts are made from phosphor bronze with a 0.51μm gold plating. The temperature range at which these TD series machined terminal strips can be used is -55° to +125°C.