Y type hanger is directly connected to the chain that is easy for installation. Its end is often connected with cross type hanger or cross disc type hanger.
U type hanger is used to work at lower position and requires manual rotating. Every 90° rotating cound fox the position.
Cross type hanger requires to wokr with Y type hanger. During chain moving, cross hanger runs into the diverter which installed in specific position, making the suspend workparts rotates 90°.
Cross disc type hanger is basically similar to the cross type hanger, the only difference is an additional disc above the hook, which is used to hold the dropping oil or dirt in case pollutes the workparts.