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Difference between wood screws and self-tapping screws.

Recently, there was a small friend’s private letter from the small editor of the Olympic Exhibition asking how to distinguish wood screws from self-tapping screws, and he took the opportunity to introduce it to you. Fasteners can be divided into three categories according to the form of thr... Read More

Hexagon bolts have three grades

In fact, hexagon bolts have three grades: A, B and C, with the following differences. Hexagon bolts are divided into three grades: grade A, grade B and grade C. Bolt connection can be divided into ordinary bolt connection and high-strength bolt connection. Ordinary bolts can be classified into gr... Read More

How to take out the expansion screw?

(1) Knock the exposed bolt into the connecting body with a hammer to separate the expansion bolt part from the expansion pipe. Then clamp the expansion pipe with pliers and pull it out with force. During the process of pulling, hold the screw inward, and then the bolt can be taken out. This metho... Read More