This standard specifies the types and dimensions of square tool shank clamps. This standard is applicable to square tool shank clamps that hold JB/T 3411.7-1999 "45° Dimensions of Square Tool Rods with Inner Hole in the Lathe" and JB/T 3411.6-1999 "Dimensions of Square Tool Rods with 90° Inner Hole in the Lathe".