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Bolt / Stud Tensioners Suppliers
Hydraulics Technology, Inc. Standard and custom hydraulic stud and bolt tensioners. Founded in 1986, HTI has supplied Hydraulic Tensioning Systems to the Petroleum, Power Generation, Nuclear Power Generation and Transportation industries. |
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- Bolt Tensioners are used to apply and maintain a desired tension on a fastener, stud, or bolt prior to and during the application of the final securing torque applied by a nut or other torque retainer. Bolt tensioners are available for all standard imperial and metric threads, as well as, custom threads. A typical bolt tensioner design incorporates a load cell or tension reading device, and applicable hydraulics, or mechanical tension application mechanism.
Bolts and studs used in critical applications, which require careful pretension or known torque / tension are normally installed by use of a bolt tensioner. Fasteners which must withstand extreme cyclic, or thermal induced loads which must be accounted for during torque are a classic example. If you have a design application using a ASTM A490 bolt, which will be loaded to approximately 110,000 lbs or approximately 85% of yield. To prevent over or under tension due to inaccurate applied torque, one might designate a pre-tension requirement on the assembly drawing for the bolt or stud. The pretension specification will normally have a high and low tension limit, and clearly indicate the requirement for a bolt tensioner.
By using a bolt tensioner in critical applications, the engineer or designer can have more confidence that the bolted joint or installation will function as designed during anticipated extreme loading conditions.
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