1. Transmission Chains
Power tranny transmission chain Chains are categorized into six major organizations.
1.1 Standard Roller Chains. These chains are created for general usage.
1.2 High Performance Chains. These chains have higher tensile strength 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 unique 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 many types of chains available
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