... American,Japan.Including Taper-Bushing, QD-Bushings, couplings,Shaft collars, Weld-on hubs, Adjustable motor mounting, chain sprockets ( ... is not a consideration.Clamp-Type Collars Clamp-Type Collars (also known as Split Collars) are designed to retain their position ... National Fine (UNF), and ACME threads. Clamp-type collars provide maximum holding power without marring your expensive threaded shafts ...