When installing fasteners with twisting regulations, the relevant large hexagonal bolts must be painted with anti-loosening marks, indicating that the fasteners have been tightened according to the regulations, so that they can be distinguished from untightened fasteners, and it is convenient to prevent them from being damaged during installation. Leakage of fasteners during use. You can do a good job of marking during the installation process. Play the role of inspection; in the subsequent product selection process, the anti-loosening mark can also be used as a basis for judging bolt looseness and preventing problems before they occur. Especially in the railway transportation industry, the status of fasteners directly affects the driving and personal safety of customers. The large hexagon bolt marker has a marking tool that can quickly draw parallel lines on the top and sides of the hexagon bolt head, the top and bottom of the seal, and the marking part of the product surface. one more time. It reasonably solves the problems of inconvenient and rapid identification, limited bolt positions and unsightly lines in the current process. The construction tools of the large hexagonal bolt anti-loosening identification tool include the following parts: 1. Pen holder; 2. Pen cap; 3. Inner protrusion of the pen cap; 4. Ink tube chamber; ;7. Ink core cover; 8. Ink core; 9. Top of ink core cover protrudes; 10. Torsion spring; 11. Concave groove; 12. Movable sponge block; 13. Convex cavity; 14. Fixed Sponge block; 15. Pen cap. When marking, just put the bolt anti-loosening wire on the outside of the sealing ring, fix the position of the bolt anti-loosening wire marking pen on the surface of the electrical product, and then press the bolt anti-loosening wire. Marking pen, make the inner cavity at the bottom of the pen body wrap the bolt head, touch the bottom of the pen body to the surface of the electrical product, take off the marking pen, and carry out the whole process of laser marking, and then the bolt can be placed on the surface of the electrical product. The line-drawing member composed of the top and side of the bolt head, the top and bottom of the sealing ring, and the surface of the mechanical and electrical equipment quickly forms parallel lines at one time.