What is the difference between a set collar and a split collar?
The set collar is more economical, but has less holding power. Also the screw can mar a shaft as it directly fastens to the shaft. The single-split collar has a tangential screw and does not touch the shaft; plus, because it can be compressed, the split collars have about 2 1/2 times the holding power of a set collar. The double-split collar has two tangential screws with the advantage that it can be put on a shaft without having to move other pulleys, bearings, or sprockets that are in place on the shaft. Obviously, it is in two pieces.
