What is the Difference between Expansion Bolt and Expansion Screw?

July 05,2022

Different composition


  1. Expansion bolt: the expansion bolt is composed of the countersunk bolt, expansion tube, flat washer, spring washer, and hexagon nut.


  1. Expansion screw: it is composed of a screw, expansion pipe, and other components. The tail of the screw is conical, and the inner diameter of the cone is larger than that of the expansion pipe.


expansion bolt


Different applications


  1. Expansion bolt: it can be fixed on the wall, floor slab, and column by pipeline support / Hanger/bracket or equipment.


  1. Expansion screw: due to small drilling, large tension, and flat exposure after use, the expansion screw can be removed at will if not used. It has significant advantages in keeping the wall flat and is widely used in various decoration occasions.


Different performance levels


  1. Expansion bolt: the principle of the expansion bolt is to drill the expansion bolt into the hole on the ground or wall, tighten the nut on the expansion bolt with a wrench, and the bolt goes outward, but the outer metal sleeve does not move. Therefore, the big head under the bolt will expand the metal sleeve to make it fill the whole hole. At this time, the expansion bolt cannot be pulled out.


  1. Expansion screw: use a wedge-shaped slope to promote expansion and generate friction grip force. The screw has a thread on one end and a taper on the other. There is an iron sheet (some are steel pipes) on the outside. There are several cuts in the half of the iron sheet cylinder. Insert them into the holes punched in the wall together, and then lock the nut. The nut pulls the screw outward to pull the taper into the iron sheet cylinder. The iron sheet cylinder is expanded and then firmly fixed on the wall.
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