4Pcs 6mm Flange Coupling Connector, Rigid Guide Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors

good

All 4 couplings were not 4mm. They were about 3.6-3.7 mm, which meant my 4mm shaft didnt fit. Probably defect if others got the right size.

Ive bought multiple sizes and all have been the same quality so Im posting the same review for all. Inside diameter fits the motor shaft very well and the face is perpendicular to the shaft. The small set screws and threaded holes they go into fit perfect. Even the hex wrench thats included is strong. The parts have no burrs or sharp edges.

parfait

Fast service, quality product

8mm shaft - perfect fit - thread tolerances are good.

Me gusto los tiempos y el producto es de excelente calidad.

I bought 2 sets of these about a week apart, a 5mm and then a 7mm. They are well made, and seem to be the correct size, assuming my 5mm shafts are exact also. However, oddly, both sets came in a little ziplock back, but if you open the ziplock the bag is still sealed and must be cut. Also, be aware that the tiny set screws hide perfectly in the flange holes, so dont lose them.

6mm flange fits the motor shaft very well, and machining and surface finish are much better than what’s shown. I wouldn’t send it to space but your also shopping Amazon not McMaster. I have no complaints with what I received.

We used for coupling volume and switching rods found in high end amplifiers and receivers such as Kenwood & Yamaha. The original ones were nylon which eventually split. Nylon lasted 40+ years, maybe the metal will last as long.