Carbon steel internal expansion bolts for door and window installation

Internal expansion bolts used in door and window installation are a common fixing method, mainly used to connect door and window frames to walls. This type of bolt consists of countersunk bolts, expansion tubes, flat washers, spring washers, and hex nuts. The working principle of expansion bolts is to use the movement of threads to open the expansion piece, thereby generating squeezing force and achieving a fixed effect. In short, internal expansion bolts play a crucial role in the installation of doors and windows. By using reasonable installation methods and precautions, the firmness and sealing of doors and windows can be ensured.