Many people found it’s really important to know about the method and principle of bolt tightening, so the following introduced few points, hope it helps.
Three ways of bolt tightening method:
Torque value tightening: the principle is the torque value have a connection with tension force. So, this way is the most simple and visual, this is the most widely used method.
Turn angle tightening: The rotation angle is roughly proportional to the sum of the bolt elongation and the loosening of the tightened part. So, the method of rotate a specified rotation angle can achieve the predetermined goal.
Yield point tightening: The theoretical goal is to tighten the bolt to the elastic range just after the yield limit point, the plastic range, and the bolt fails.
Bolt tightening sequence principle 1、Fasten by middle, back two sides, diagonally, clockwise, and in stages; 2、Can be separated into 2 steps, first use only 50% of goal torque value, second step 100%. 3、The nut should left 1-3 screws out of nut. Shandong HANPU machinery industrial Co. Ltd is a manufacture integrating production, research and development, sales and services. Main products includes: Electric Shear Wrench, Electric Torque Wrench, Manual Shear Wrench, Manual Torque Wrench, Bolt Tension&Torque Calibrator, Bolt Tension Calibrator, etc. We provide professional support, maintance and after sales services. Shandong HANPU machinery industrial Co.,Ltd located in the Economic Zone of Qihe, Dezhou. After over 20 years of innovation and development, Hanpu now own 62 acres of factory. Has introduced a large number of high-end processing equipment from Switzerland, Germany and Japan to meet user needs for high-quality products. For details, please contact: +86-531-83530737 Fax: +86-531-83530747
