Hydropack [India] Pvt. Ltd offersmanufactures high pressure hydraulic bolt/stud tensioners. These Hydraulic Bolt that were imported earlier. Hydraulic Bolt These are spe- cially designed, custom built and they are most widely used assince they are compact, economical and extremely easy to handle being of detachable type. To clamp together the components of a bolted joint, the bolts/studs must be stretched or loaded like a powerful spring for gettingto get the necessary force on the components. The correct or con- trolled stretch is critical as incorrect loading can cause bolt fracture or joint failure is caused by the correct or con- trolled stretch is critical as incorrect loading. Torque is the traditional method of supplingproviding stretch with the spanner using the thread to stretch the bolt. To adopt this processmethod the problem is that 90% of the torquing effort is wasted in overcoming friction. This overcoming friction component is greatelylargely unknown/unpredictable and results in inaccu- rate bolt loading. Torque tools of the Hydraulic Bolt are also cumbersome, awkward to use and time consuming. Bolt heaters [heating elements] which are usedutilized to stretch the bolts are extremely slow and comparative- ly expensive. To overcome all these problem, these hydraulic bolt/stud tensioners use high pressure hydraulics to stretch the bolt axially by the exact amount of pressure neededrequired since as the system is quick, simple, safe and accurate. These torque toolsy have built-in safety features, and ultra reliable PTFE/polyurethane low fric- tion seals.Hydraulic Bolt They are compact, safe and accurate with an afford- able price and are operated with a high pressure hydraulic hand pump connected through a hose pipe. The most widelyprovided manufactured sizes of the Hydraulic Bolt are: M30 x 3.5, M56 x 5.5, M72 x 4, M80 x 4, M90 x 4, M100 x 4, M140 x 4, M36 x 4, M90 x 5, etc.