12mm Hex Hubs Pair, 4mm Bore (for DartBox & More)

These hex hubs are perfect for mounting wheels or 3D printed custom parts to 4mm motor shafts such as our very own DartBox Gearmotors. Made from strong yet lightweight 6061 aluminum, at 1/3rd the weight of brass or steel, these hubs will fit in well on almost any bot with direct-driven wheels! There are two extra tapped holes for inserting long set screws or normal M4 screws on the hex side to help secure narrower wheels, gears, pulleys, and more. And unique to these hubs is a precision turned 12mm diameter for adding a bearing (sold here) or bushing support to protect otherwise fragile direct-driven wheel setups.Each package contains two (2) hubs, two (2) M4 x 10mm flat head screws, and four (4) M4 x 4mm set screws!  NOTE: Starting in November 2023 these hubs no longer have a thread on the end, they will have a 4mm straight bore all the way through.  These hubs are compatible with: DartBox Viper & Dragon Drive and HR 4mm Gearmotors DartBox Gecko 4mm Servocity Premium Planetary Ge