The No. 90 traction pin represents a diameter of 90mm, and the assembled traction pin consists of a tray, traction pin, and 8 self-locking bolts. According to the thickness of the sliding plate, there are three types of assembled traction pins: 8/10/12. The traction pin is used to weld the pallet onto the sliding plate of the semi-trailer. When the assembled traction pin is worn or accidentally damaged and needs to be replaced, remove 8 self-locking bolts (self-locking bolts are disposable) and tighten the new traction pin with 8 self-locking bolts.