Torque Test

The mechanical splicing and fixing of structural steel members always require the fastening of the sets of bolt , washer and nut , and the degree of tightening or the torque achieved has to be checked by the site supervisor to ensure the set of components is adequately secured . The specification may state the required torque value for each kind of fixing components which may differ from their type of material , size and structural requirement . If it is too tight , it will induce an excessive stress on the threads of nut , and if it is too loose , the nut may easily fall out . The measurement of the torque is demonstrated usually by the use of a torque wrench to indicate the value in N-m .