A193 B7 double head bolt and nut B16 double head bolt and nut double head threaded bolt

The working principle of a nut is to use the friction force between the nut and the bolt for self-locking. However, the reliability of this self-locking will decrease under dynamic loads. In some important occasions, we will take some anti loosening measures to ensure the reliability of nut locking. One of the anti loosening measures is to use a locking nut. There are also two types of locking nuts available. One is to use two identical nuts to screw onto the same bolt and attach a tightening torque between the two nuts to ensure reliable bolt connection. The other type is a specialized locking nut that needs to be used together with a locking washer. As shown in Figure 1, a plastic gasket 2 is installed in the center of nut 1 to achieve locking effect, but its process is complex and production is inconvenient. A type of threaded hole is drilled from the outer surface of the nut to the inner threaded surface (usually 2, distributed 90 degrees on the outer surface), which is used to screw in small diameter countersunk screws. The purpose is to apply a centripetal force to the thread to prevent the locking nut from loosening. The high-quality lock nuts currently sold in the market are embedded with copper small pieces on the inner circular surface of the nut that are consistent with the thread of the lock nut, to prevent the radial top screw from directly contacting the locked thread and damaging the latter. This type of locking nut is gradually being applied in shaft end locking situations of rotating motion parts, such as anti loosening of ball screw mounting end bearings. The process is equally complex.

Rivets are usually used for connecting and riveting between objects, and specific specialized tools are usually required for operation. There are many types of rivets, such as half round head rivets, flat cone head rivets, countersunk head rivets, half countersunk head rivets, flat head rivets, hollow rivets, tubular rivets, sign rivets, etc., to meet different operational needs.

In machine tool processing, it is often necessary to calibrate and debug the probe. The method of using manual correction and detection has low efficiency and unstable accuracy, and in addition, accidents such as collisions may occur. However, calibration tools such as ring gauges are expensive, have a large working range, and have poor universality. Technical implementation elements: Given the above, it is necessary to provide a positioning pin for probe calibration to address the above issues. A positioning pin used for calibrating a probe, which includes a connected column and a column. The column is used for installing on a fixture inside a machine tool, and the end of the column that is away from the column is equipped with a measuring hole to calibrate the probe. Furthermore, the locating pin is also provided with a chip removal hole, one end of which is connected with the measuring hole, the other end of which runs through the end of the cylinder that is away from the cylinder, and the chip removal hole is used to discharge machining chips and Cutting fluid. Furthermore, the diameter of the chip removal hole is smaller than the diameter of the measurement hole. Furthermore, the positioning pin also includes a positioning component, which includes a base and a magnetic component. One end of the base is provided with an installation hole to install the magnetic component, and the other end of the base is provided with a limit hole to install the column. Furthermore, the limit hole is connected to the installation hole. Furthermore, the limit hole is a blind hole. Furthermore, the diameter of the column is greater than the diameter of the column. Furthermore, the measuring hole is a cylindrical hole. Furthermore, the diameter of the cylindrical hole is 4 millimeters. Furthermore, the end face of one end of the column equipped with the measuring hole is a curved surface, and the end face bends and transitions towards the circumferential wall of the column to connect the positioning pin of Guangdong Yueluo Hardware Industry Co., Ltd. with the measuring hole

The thread batches in existing automatic locking screw machines are all designed to attract threads through air intake, with a complex structure that requires consideration of the design of the air path and is prone to bulging. Additionally, due to the air path, deep hole locking of threads is not possible, which brings great inconvenience to users.

By adopting the above technical solution, it is beneficial to eliminate the stress concentration between the pin cap and the pin rod, increase the strength of the pin, and make the pin difficult to cut.