🔧 4-Piece Set of 6mm Flange Coupling Connectors - Rigid Guide Model Coupler for DIY RC Model Motors, High-Quality Shaft Axis Fittings Review

I was just trying to use my 6mm rod but found it was 5.9mm and didn't fit. Super shit, it should be 6.1mm anyway, that's what the adjusting screws are for!

The description says they are made from heat treated steel. However, they bore easily and generate chips similar to cast iron. The spark test also indicates cast iron. The shaft holes are not framed and are not very accurate. The flange is suitable for non-critical applications. I wouldn't use them for high RPM applications or for transmission.

I needed a way to connect a small 5v motor to the ROKR Marble Run puzzle. These connection flanges fit a 3.5mm diameter motor shaft and provide an easy way to attach to the crank. They came with two set screws for each of the four flanges, although one was missing. It didn't matter because I didn't need them anyway. I have three unused flanges in case anyone needs them.

I bought 2 sets of these about a week apart, 5mm and then 7mm. They are well made and appear to be the right size, assuming my 5mm rods are accurate too. Strangely, both kits came with a small zipper on the back, but when you unzip, the packaging is still sealed and needs to be cut open. Also remember that the tiny set screws hide perfectly in the flange holes, so don't lose them.