Precautions for the use of Bolt Factory products:
 
There is a fundamental difference between stainless steel and carbon steel. Stainless steel has good ductility. Improper use will cause the screw and nut to be unscrewed after being matched. It is often referred to as "lock-in" or "bite".
The improvement of the lock can mainly be considered from the following aspects:
 
1. Choose the right product:
 
(1) Before use, confirm whether the mechanical properties of the product can meet the use requirements (such as the tensile strength of the bolt and the safety load of the nut);
(2) The length of the bolt should be selected according to the 1-2 pitch of the exposed nut after tightening.
 
2. Reduce friction coefficient:
 
(1) The thread must be kept clean;
(2) Appropriately add lubricating oil (such as: 40# engine oil, butter) before use.
 
3. The correct method of operation:
 
(1) The nut must be screwed in perpendicular to the axis of the lead screw, and must not be inclined;
(2) During the tightening process, the force must be even and must not exceed the safe torque value (safe torque table attached);
(3) Try to use torque wrenches or socket wrenches, and avoid using adjustable wrenches or electric wrenches;
(4) It must be cooled when used at high temperature, and do not rotate quickly when used, so as to avoid the rapid rise of temperature and cause jamming (such as electric wrenches, etc.).
 
4. China Nut safety torque reference table:
 
(1) Equipment used: torque wrench, vise, matching sleeve:
(2) Performance grade of screws and nuts; A2-70, 304 material, tensile strength: 700N/mm², yield strength: 450 N/mm²;
(3) Operation method: clamp the screw head vertically on the vise, clamp the workpiece, clamp a flat washer and a spring washer in the middle, then put on the nut to apply force evenly, when the force acting on the nut reaches the following value setting After that, the nut can no longer be unscrewed smoothly.
(4) Safety torque table: Unit: Nm Specification M20-2.5 M18-2.5 M16-2.0 M14-2.0 M12-1.75 Safe torque 220 180 150 100 55 Specification M10-1.5 M8-1.25 M6-1.0 Safe torque 40 Note: 4 or more The data is based on the above experimental conditions and is for reference only. The actual data is affected by the construction conditions, but the maximum torque must not be exceeded.