Instructions for correct use of stainless steel fasteners

Due to the essential difference between stainless steel and carbon steel, stainless steel has good ductility. If used improperly, the screw and nut cannot be unscrewed after being matched, commonly known as “locked” or “seized”. The improvement of “lock-up” or “bite” is mainly improved in the following areas:

1. Choose the correct product:

Before use, confirm whether the mechanical properties of the product meet the requirements of use, such as the tensile strength of the bolt and the safety load of the nut. The length of the bolt is tightened and the nut is exposed by 1-2 tooth saws.

2. Correctly reduce the friction coefficient:

The thread must be kept clean, it is recommended to add lubricant oil before use.

3. Correct use method:

　　1) The nut must be screwed perpendicular to the axis of the screw, and do not tilt;

　　2) During the tightening process, the force must be evenly applied, and the force must not exceed the safe torque;

　　3) Use torque wrenches or socket wrenches as much as possible, and avoid using adjustable wrenches or electric wrenches;

4) In the high temperature state, it must be cooled during use, and do not rotate quickly during use, so as to avoid the rapid rise of temperature and cause lockup.

4. Safe Torque Table (For reference only) Unit: N.m