1. Transmission Chains
Power tranny chains are categorized into six major groups.
1.1 Standard Roller Chains. These chains are created for transmission chain general usage.
1.2 High Performance Chains. These chains have higher tensile power and greater fatigue strength.
1.3 Lube-Totally free Chains. These chains have longer wear life than regular chains without lubrication.
1.4 Environmentally Resistant Chains. Chains with special corrosion resistance.
1.5 Specialized Chains, Type 1. For specific applications.
1.6 Specialized Chains, Type 2. For general designs.
Within these six groups, there are numerous types of chains 
available