Build your own tensioner. Ball bearing idler sprockets are fully machined with hardened teeth which offers increased wear resistance to extend sprocket life. The ball bearings are precision ground, double-sealed. They spin freely on the built-in bearings to guide and control slack in your chain. The pitch is 5/8" and the sprocket is for a shaft diameter of 5/8". These are rated for up to 4000 RPM. The RPM's are dependent on the load size.
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