Hydropack [India] Pvt. Ltd. Offers Hydraulic Bolt / Stud Tensioner. Hydropack [India] Pvt. Ltd. Is an ISO 9001:2008 accredited company. Hydraulic Bolt / Stud Tensioner is used to clamp together the components of a bolted joint the bolt or stud must be stretched or loaded like a powerful spring to get the necessary force on the components. The correct load or controlled stretch of Hydraulic Bolt / Stud Tensioner is critical as incorrect loading which can cause bolt fracture and joint failure. To avoid all these problems these are the most suitable equipment and are detached and easy to handle too.