• Hydropack (India) Private Limited

Hydraulic Bolt/Stud Tensioner

Hydropack (India) manufactures high pressure hydraulic bolt/stud tensioners that were imported earlier. These are spe- cially designed, custom built and are most widely used since they are compact, economical and 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 to 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. Torque is the traditional method of providing stretch with the spanner using the thread to stretch the bolt. To adopt this method the problem is that 90% of the torquing effort is wasted in overcoming friction. This friction component is largely unknown/unpredictable and results in inaccu- rate bolt loading. Torque tools are also cumbersome, awkward to use and time consuming. Bolt heaters (heating elements) which are utilized 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 required since the system is quick, simple, safe and accurate. They have built-in safety features, and ultra reliable PTFE/polyurethane low fric- tion seals. 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 widely manufactured sizes 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.