The repairing gecko extends into the tube sheet hole, and the end of the tube rolls to expand the inner wall of the tube, causing plastic deformation, increasing the diameter of the tube, and the t...
The function of the hollow gecko is the same as that of the screw. It is used when self-tapping screws and expansion screws are not suitable. For example, in the light steel frame partition wall ha...
Carriage bolts are divided into large semicircular head carriage bolts (corresponding to standard GB / T14 and DIN693) and small semicircular head carriage bolts (corresponding to standard GB / T12...