The Choosing Of Hydraulic Torque Wrench

The bolt and nut pretightening force recommended chart

• This is Germany standard (DIN) above,the figure in the form is the max torque of the bolt,and the recommended torque is 80% of chart figure
• The recommended tightening torque equals the figure in the form*(80~90%).For instance :M52,strength grade is 8.8,the torque is 4704*90%=4233.6N.m
• lt is recommended that loosening torque equals about 150% of tighting torque.For instance,the tightening torque is 4233.6*(1.5~2)=6350.4~8467.2N.m