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