High technique requirements O-Ring Roller Chain:35,40,50,60,80,100,06B,08B,10B,12B,16B The service life of O-Ring Chain is greatly depended on the wearing between the pin-shaftand the sleeve. The "O" ring will greatly reduce the wearing and thus prolongthe service life by 5 times. It is especially suitable for the adverse environmentssuch as the one bearing water, mud or dust. It is most suitable ...