This product is produced through precision forging, undergoes machining with gear shapes, surface heat treatment, and grinding processing to meet the precision requirements. It is a key component of the clutch. The inner diameters of this product all have splines. The coaxiality between the inner spline and the welded outer diameter, as well as the runout tolerance of the end face, are all of high requirements. Our market share of the wet dual-clutch transmission main hub is leading in China.