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 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.