1. Transmission Chains
Power transmitting chains are categorized into six major groupings.
1.1 Regular Roller Chains. These chains are made for general usage.
1.2 POWERFUL Chains. These chains have higher tensile power and greater fatigue strength.
1.3 Lube-Free Chains. 
These chains have longer use life than regular chains without lubrication.
1.4 Environmentally Resistant Chains. Chains with transmission chain special corrosion resistance.
1.5 Specialized Chains, Type 1. For particular applications.
1.6 Specialized Chains, Type 2. For general designs.
Within these six groups, there are many types of chains available