4Pcs 4mm Flange Coupling Connector, Rigid Guide Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors

I needed a flange for mounting a plastic fan unit that came with a flimsy flange molded in, that had failed.I dremelled out the old flange and added one of these metal flanges attaching it with screws and glueBonus It comes with an allen wrench of the right size for the tiny set screws supplied

Used these to make a couple of lure turners. Worked very well. Solid and seem durable. Great value

These are excellent couplers . They are well balanced , centered and stout.

Not for high torque applications. I was planning on using this with a d shaft motor capable of producing more than 30kg-cm of torque. Unfortunately the set screw gets pushed out and strips the threads around 20kg-cm of torque. I tried a longer M3 screw and while better than the provided set screw it didn't work either. The single set screw per side is not a good design for higher torque applications. Other than that they seem great.

Great

as advertised

NIce quality. I actually welded one of these couplers to a fender washer to make a replacement dryer knob that was no longer available.

Showed up on time and was what I expected.