1) Main roller

The main roller is the most important carrier of a set of composite rollers, which mainly bears vertical loads and impact loads, and has strong impact resistance, wear resistance and corrosion resistance. Since the main roller is a fully loaded roller bearing, it can also be used separately as a one-way bearing.

2) Side roller

The side roller is the second carrier in a set of composite rollers, which mainly bears the horizontal load, and also has strong impact resistance, wear resistance and corrosion resistance. The side roller is designed for full needle rolling without inner ring, and a core shaft replaces the inner ring and the shaft head.　

3) Shaft head　　

The shaft head is a part of the connection between the composite roller and the machine and equipment. Usually, the shaft head is designed as a chamfer for easy installation. The shaft head can be directly welded to the equipment, or the shaft head can be welded to the connecting plate with a round hole and then the connecting plate and the equipment can be assembled.　　

4) Cover plate　

The function of the cover plate is to fix the side roller installed inside the shaft head and the main roller outside the shaft head together with the nut and thread glue at the tail of the shaft head.