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Leaf chains are steel chains with a simple pin construction and link plate. The chain number refers to the lacing of the links and the pitch. The chains have specific features like for instance high tensile strength for each section area, which allows the design of smaller machines. There are B- and A+ kind chains in this series and both the AL6 and BL6 Series comprise the same pitch as RS60. Finally, these chains cannot be driven with sprockets.
Comparably, in roller chains, all of the link plates have higher fatigue resistance due to the compressive stress of press fits, whereas in leaf chains, only two outer plates are press fit. The tensile strength of leaf chains is high and the most acceptable tension is low. When handling leaf chains it is important to check with the manufacturer's handbook in order to guarantee the safety factor is outlined and utilize safety measures always. It is a good idea to apply utmost care and use extra safety guards in applications where the consequences of chain failure are severe.
Higher tensile strength is a direct correlation to the use of much more plates. As the use of more plates does not enhance the most allowable tension directly, the number of plates may be restricted. The chains need regular lubrication as the pins link directly on the plates, generating a very high bearing pressure. Making use of a SAE 30 or 40 machine oil is often suggested for nearly all applications. If the chain is cycled over one thousand times on a daily basis or if the chain speed is over 30m per minute, it will wear very fast, even with continuous lubrication. Therefore, in either of these situations the use of RS Roller Chains will be a lot more suitable.
AL type chains are only to be used under particular situations like for instance where there are no shock loads or when wear is not really a huge concern. Make certain that the number of cycles does not exceed one hundred day after day. The BL-type would be better suited under other situations.
If a chain with a lower safety factor is chosen then the stress load in components would become higher. If chains are used with corrosive elements, then they may become fatigued and break somewhat easily. Doing regular maintenance is important when operating under these kinds of conditions.
