4007 Series Hyper Coupler (12mm REX™ Bore to 12mm REX™ Bore)

Designed for heavy-duty action with positive-drive shafting, this 12mm REX™ Bore Coupler allows you to connect two lengths of 12mm REX™ shafting together in a compact form factor. And as with all components of the “Hyper” moniker, this Coupler is exquisitely balanced—you can spin it up without concern of creating unwanted vibrations through your drivetrain.

The convenient built-in shims allow you to put the coupler against a bearing without contacting the bearing’s outer race.