These self-centering vises position and clamp workpieces exactly on a defined symmetrical axis. They are ideal for quickly and easily aligning a series of these vises on a machine worktable. They have a unique jaw adjustment feature for quickly matching centerlines in multiple vise setups thereby reducing setup time. In addition, they provide fast part workholding for better spindle utilization and reduced machine travel part-to-part. Centering accuracy for these vises from minimum to maximum opening is 0.0006 in. with 0.0002 in. repeatability.