How Bolts Work

Bolts secure connections through the friction and tension of their threads. Their working principle is as follows: after passing through the hole in the connector, tightening the nut subjects the threaded part of the bolt head to tensile force (typically 400-1000 MPa). The vertical tightening force generated by the inclined plane effectively prevents loosening. Key parameters include thread accuracy (4H/6g grade), tensile strength (e.g., 800 MPa for 8.8 grade bolts), and torque value (must be matched according to material). Application scenarios include building steel structures (for seismic requirements) and heavy machinery (for high loads).