... L,H,XH,XXH) HTP Timing pulleys(3M,5M,8M,14M,20M),T/AT Timing pulleys (T2.5,T5,T10, ... L,H,XH,XXH) HTP Timing pulleys(3M,5M,8M,14M,20M),T/AT Timing pulleys(T2.5,T5,T10, ... T20,AT5,AT10),BTL Timing pulleys(L,H,XH)The surface treatment of timing belt pulleys is black phophated ... supply the flanges of the timing pulleys according to the pulleys part numbers.all series of timing pulleys have adopted advanced ...