Abstract: A sliding block (8) for securely clamping a clamping tool on an underlying surface, in particular a clamping table (7), which exhibits at least one T-slot shaped clearance (18), having a base (14) which may have a rectangular outline and a clamping plate (15) which exhibits a pair of anchorage continuations (16) which project with respect to the base (14) and are in a symmetrical arrangement. A threaded bore (12) is provided which passes through the base (14) and the clamping plate (15) and receives a fastening bolt (9). The clamping plate (15) has a further pair of anchorage continuations (17) and the base (14) and the clamping plate (15) with the two pairs of anchorage continuations are matched to two T-slot-shaped clearances (18, 19) of different geometry. The two pairs of anchorage continuations (16, 17) on the clamping plate (15) are, with respect to the axis (13) of the threaded bore (12), turned through an angle of 90.degree. with respect to one another.

Abstract: A device for securely clamping a workpiece (2) on a clamping table (1), which device has a guide shoe (3) which can be fastened on the clamping table (1) and has T-slot-shaped clearances (35) which continue, in a symmetrical arrangement, over the length of the guide shoe. The device also has a clamping claw (8) which is designed as a tilting lever and has a clamping leg (10) and a bracing leg (9). A clamping bolt (11) is provided which passes through the clamping leg (10) in the region of its free end and, in the clamping position, fixes the clamping claw (8) relative to the guide shoe (3) and securely clamps the workpiece (2). A bearing plate (4) is provided between the guide shoe (3) and clamping claw (8) and the bearing plate (4) is guided in a sliding manner in the T-slot-shaped clearances (35) by means of strip-like protrusions (21).