This standard stipulates the size and spacing of T-shaped slots, and also specifies the relevant dimensions of corresponding bolts and nuts. This standard applies to metal cutting machine tools, woodworking machine tools, forging machinery and accessories, fixtures, devices, etc. Other machines with T-shaped slots should also be used as a reference.
GB/T 158-1996 history
1996GB/T 158-1996 Machine tool tables--T-slots and corresponding bolts