T-screw and ball screw are two different series of screws. T-type screw is the earliest type of screw, with simple structure, average precision, low cost and cheap price. Ball screw is a product that comes up slowly in response to the subsequent market demand, and it is the mainstream screw in the market now. T-type screw now has a low market share and is coming to an end. If it is an old model before, you can find the original supplier to provide it, but many manufacturers have stopped production. If the new model needs a screw, please choose according to the type of ball screw.