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An Old ProblemThe holding force of a bolt increases with the square of its diameter. To make use of this force, it is necessary to tighten the bolt until it is prestressed to a pre-determined level. While the force of the bolt increases to the second of the diameter, the torque required for prestressing increases to the power of three. The torque exerted by ordinary tools such as hand wrenches, torque wrenches and air impact wrenches is LIMITED. Bolts greater than 1inch diameter cannot be effectively prestressed to capacity with hand tools. |
A Simple ConceptSUPERBOLT Tensioners are designed as direct replacements for hex nuts. These devices can be threaded onto a new or existing bolt, stud, threaded rod or shaft. The main thread serves to position the tensioner on the bolt or stud against the hardened washer and the load bearing surface. Once it is positioned, actual tensioning of the bolt or stud is accomplished with simple hand tools by torquing the jackbolts which encircle the main thread. All SUPERBOLT products utilize this same principle. |