The vertical joint surface of the coupling part has a circular runout tolerance grade of 6 for the end face of the rotating center, and a circular runout tolerance grade of 7 for other end faces; The tolerance class of radial circular runout of the mating surface and the guide face rotation center is 6. The radial runout tolerance class of other cylinders is 7; The coaxiality tolerance of the mating surface and the steering face rotation center is class 5. The seller of the coupling shall specify the required bolt tightening torque value, and the vertical flange of the wheel hub and the spacer shall be made of reaming bolts and self-locking nuts with hole size tolerance of H8. Bolts should be limited to a certain mass range to avoid adverse effects on the balance of the coupling when exchanged. When the buyer requires the coupling to be electrically insulated, the coupling with a spacer should be selected, and the flange joint surface and the bolt part should have electrical insulation.

The vertical joint surface of the coupling part has a circular runout tolerance grade of 6 for the end face of the rotating center, and a circular runout tolerance grade of 7 for other end faces; The tolerance class of radial circular runout of the mating surface and the guide face rotation center is 6. The radial runout tolerance class of other cylinders is 7; The coaxiality tolerance of the mating surface and the steering face rotation center is class 5. The seller of the coupling shall specify the required bolt tightening torque value, and the vertical flange of the wheel hub and the spacer shall be made of reaming bolts and self-locking nuts with hole size tolerance of H8. Bolts should be limited to a certain mass range to avoid adverse effects on the balance of the coupling when exchanged. When the buyer requires the coupling to be electrically insulated, the coupling with a spacer should be selected, and the flange joint surface and the bolt part should have electrical insulation.