Generally, nuts may loosen during use due to vibration or other reasons. To prevent this, the hex step nut was invented.
Hexagonal step nuts primarily serve the function of anti-loosening and vibration resistance. They are used in special occasions.
Hexagonal stepped nuts are typically self-locking by friction.
Nylon ring embedded, neck-closed, and with metal tension release. They all fall under the category of effective torque type anti-loosening nuts.
Hexagonal step nut size standard
a. When the tolerance grade is A or B, the AQLs are as follows: Edge width, diagonal size, thread go/no-go gauges are all 1.0; head bottom radius is 1.5; all other items are 2.5.
b. When the tolerance grade is C, the AQLs are as follows: edge width, diagonal size, thread gauge, and thread stop gauge are all 1.5; all other items are 4.0.
