When installing the tool, it is often seen that the wrench is marked with Torx or Torx Plus.

Torx is what we usually call a plum blossom screw.

The formal name of the plum blossom screw is ISO10664 screw or hexagonal internal, also known as star socket screw. It is a type of screw fastener developed and launched by Camcar Textron in 1967. Because Kangjia applied for a patent for the product name Torx, it is also known as Torx screw.

--Source: Baidu Baike

(Figure 1)

Figure 1 shows the common shape of Torx screws.

This is a hexagonal star symmetrical plum blossom shape, with the convex tops of each corner being circular in shape.

(Figure 2)

Figure 2 shows the Torx Plus derived from this shape ®  Improved the radial stress vector generated by the tool during the fastening process to achieve more efficient torque transmission.

Compared with hexagonal bolts and nuts, they have higher torque transmission efficiency, lower stress concentration, and therefore high durability against cracking and wear. At present, it is widely used in various industrial machinery.

Summary of Knowledge

From the shape, it can be seen that the Torx wrench can be inserted into the Torx Plus screw for operation, but there will be a gap between the screw hole and the wrench during use, and frequent use may cause damage due to stress concentration. Therefore, it is essential to ensure that it cannot be confused before use.