081 roller chain
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this chain is very popular in European market and usually used in the industrial machine.
in china, it is also called the bike chains, can be used all kinds of bicycle.
the roller diameter=7.77mm
the width between inner plates=4.76mm
the pin diameter=3.6mm
the average tensile trength=7.6kn
the weight per meter=0.32kgs
and the plate materail is 40Mn. so with the good quality, it is also very sold well in the south America, such as the chile, the argentina. there it is usually used for the auto-door of the garage.