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Description: Set screw hubs offer a cheap way to attach hub mount gears or wheels to a shaft. The hub offers 4 equally spaced 6-32 tapped holes utilizing the 0.77" hub pattern and is precision machined from 6061 T6 aluminum. The set-screw is 10-32 and uses a 3/32” hex key. This hub has a 5/16" bore.

Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building complex electromechanical prototypes or finished projects a reality.


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I have some 8mm shaft generators I needed to adapt to a 5/8" shaft from a water wheel. 5/16 is a bit smaller than 8 mm but I was able to fit the hub to the 8mm shaft and screw it to a plate with a 5/8" bore. The waterwheel is working and generating power. This solution was far less expensive than any other alternative.