Abstract: A centric clamping vise includes a base support including a longitudinal groove and two longitudinal tunnels at two sides of the groove respectively; a threaded spindle including an intermediate, ring-shaped enlargement, a right-handed-threaded section between the enlargement and a first end, and a left-handed-threaded section between the enlargement and a second end; a first jaw moveably disposed on a first end of the groove and including a threaded channel with the right-handed-threaded section disposed through; a second jaw moveably disposed on a second end of the groove and including a threaded channel with the left-handed-threaded section disposed through; an upper positioning member including two side shoulders, two threaded holes and a half-circular bottom cavity; a lower positioning member including two threaded holes and a half-circular top cavity; and two set screws each driven through the threaded holes to join the upper and lower positioning members.