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SEMS Screws also called SEMS bolts are a triple combination part or two combination parts with spring and flat washers known as double SEMS screws, it is made of ordinary screws with spring flat washers. When the washer is put on, it will not fall off. with the different drive systems, Phillips, Torx, hex socket, External Hex Drive, and different materials stainless steel and steel with black and nickel plating finished. 

Metric SEMS screws size M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12