0.5 in. Key HubThis hub is set with a 1 2 in. bore with two 1 8 in. keyways. Description Specifications Documentation This is the "500EX Key Hub". It is a slightly different version of the 500 Key Hub. It is manufactured differently, as it is extruded. Also, there is a 1. 124 in. diameter boss on each side of the hub flange, providing a location for 1. 125 in. bore flat sprockets. Are you having a hard time keeping your sprocket concentric with your hub? This hub is
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product description
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This hub is set with a 1/2 in. bore with two 1/8 in. keyways.
Description
Specifications
Documentation
This is the "500EX Key Hub". It is a slightly different version of the 500 Key Hub. It is manufactured differently, as it is extruded. Also, there is a 1.124 in. diameter boss on each side of the hub flange, providing a location for 1.125 in. bore flat sprockets. Are you having a hard time keeping your sprocket concentric with your hub? This hub is the trick.
The bore is a 1/2 in. hole with two 1/8 in. keyways. Only one keyway is needed to drive most wheels, so the second one is extra.
Also, the keyways are consistently aligned with the mounting holes.
Bolt Pattern: 0.204 in. diameter holes on a 1.875 in. bolt circle