Bolt Tensioning
Integrated Specialty Services and its highly experienced workforce also understands the need of bolt tensioning. The objective of tensioning is to stretch the bolt, or stud, to a predetermined load, by using force to elongate the shank. This is accomplished using a pulling or pushing force which is created by a hydraulic cylinder. The nut can then be seated manually using a wrench. It is necessary to have some extra thread above the nut, which is used to attach the pulling cylinder but is removed after completion.
Tensioning is the direct axial stretching of the bolt to achieve preload. Inaccuracies created through friction are eliminated. Massive mechanical effort to create torque is replaced with simple hydraulic pressure. A uniform load can be applied by tensioning multiple studs simultaneously. Tensioning requires longer bolts, and a seating area on the assembly around the nut. Tensioning can be done using detachable Bolt Tensioners or Hydraulic Nuts.