1. Transmission Chains
Power transmission chains are classified into six major organizations.
1.1 Standard Roller Chains. These chains are made for general usage.
1.2 High transmission chain Performance 
Chains. These chains possess higher tensile power and greater fatigue power.
1.3 Lube-Free Chains. These chains have longer wear life than standard chains without lubrication.
1.4 Environmentally Resistant Chains. Chains with particular corrosion resistance.
1.5 Specialized Chains, Type 1. For specific applications.
1.6 Specialty Chains, Type 2. For general designs.
Within these six groups, there are many types of chains available