1. Transmission Chains
Power transmission chains are classified into six major groups.
1.1 Standard Roller Chains. These chains are designed for general usage.
1.2 POWERFUL Chains. These chains possess higher tensile strength and greater fatigue strength.
1.3 Lube-Totally free Chains. These chains have longer use life than standard chains without lubrication.
1.4 Environmentally Resistant Chains. Chains 
with special corrosion resistance.
1.5 Specialty Chains, Type 1. For particular applications.
1.6 Specialty Chains, Type 2. For general transmission chain designs.
Within these six groups, there are plenty of types of chains available