Precautions for product use: There is an essential difference between stainless steel and carbon steel. Stainless steel has good ductility. If it is used improperly, the screw and nut can not be unscrewed. That is commonly known as "locked" or "killed." Improving locks can be considered mainly from the following aspects:
1. Choose the right product:
(1) Before using, confirm whether the mechanical properties of the product can meet the requirements of use (such as the tensile strength of the bolt and the safety load of the nut);
(2) The length of the bolt should be selected appropriately to tighten the nut and expose 1-2 teeth.
2. Reduce the coefficient of friction:
(1) The thread must be kept clean;
(2) Add lubricant (such as 40# engine oil, butter) before use.
3. The correct way of operation:
(1) The nut must be screwed perpendicular to the axis of the screw, not to tilt;
(2) During the tightening process, the force must be uniform, and the force should not exceed the safe torque value (with the safety torque table);
(3) Use torque wrench or socket wrench as much as possible to avoid using adjustable wrench or electric wrench;
(4) It must be cooled when it is used at high temperature, and should not be rotated quickly during use, so as to avoid sudden rise in temperature and cause locking (such as electric wrench, etc.).
4. Safety Torque Reference Table:
(1) Equipment used: torque wrench, bench vise, matching sleeve:
(2) Screw and nut performance grade; A2-70, 304 material, tensile strength: 700N/mm2, drop strength: 450 N/mm2;
(3) Working mode: vertically clamp the screw head on the bench vise, sandwich a piece of workpiece in the middle, a flat pad and a spring pad, and then apply the nut evenly to apply the force as the nut to the following. When the value is exceeded, the nut can no longer be smoothly unscrewed.
(4) Safety torque table: Unit: Nm Specification M20-2.5 M18-2.5 M16-2.0 M14-2.0 M12-1.75 Safety torque 220 180 150 100 55 Specification M10-1.5 M8-1.25 M6-1.0 Safe torque 40 40 9 Note The above data are obtained for the above experimental conditions and are for reference only. Actual data is affected by construction conditions, but the maximum should not exceed this torque.
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