5.08 mm Pitch Stacking Terminal Block. A professional range of Stacking PCB Terminal Blocks with 5.08 mm pitch. Series MB312-508 Stacking PCB Terminal Blocks have square Tin plated PC tails which are 0.8x0.8 mm by 3.5 mm long, are for 12-26 AWG wire and have slotted head screws. Series MB422-508 Stacking PCB Terminal Blocks have rectangular Tin plated PC tails which are 1.0x0.8 mm by 3.5 mm long, are for 12-24 AWG wire and have posidrive type head screws. Various positions available.