Fixing method specifically: shoulder, collar, sleeve, shaft extension. Round nut, shaft end ring. Shaft collar, shoulder, shaft extension characteristics: simple structure, reliable positioning, can bear large axial force. Commonly used in gear, chain wheel, pulley, coupling and the bearing positioning.

The sleeve features: simple structure, reliable positioning, the shaft does not need to be slotted, drilling and cutting thread, so does not affect the fatigue strength of shafts, are generally used for parts with smaller clearance occasions, so as not to increase the weight of the structure, the rotational speed of the shaft is very high it is unfit for use.

Round nut characteristics: reliable fixation, convenient assembly and disassembly, can bear large axial force, as a result of the shaft cut thread, so the shaft fatigue strength reduction, the commonly used double round nut and lock washer fixed shaft parts, when the parts spacing is larger, can also be used in place of the sleeve circular nut to reduce structural weight