Mining Bolting Applications

An Old Problem: The strength of a screw fastener increases with the square of its diameter and the torque required increases with the third power. Because of this, bolts with a diameter greater than 1 inch cannot be effectively torqued to capacity with hand tools. To achieve high preload levels, some form of high energy equipment is required, such as slugging wrenches, crane wrenches, hydraulic wrenching and hydraulic tensioning. These methods can be unsafe, time consuming, and expensive.

The Simple Solution: Superbolt® Tensioners are designed as direct replacements for standard bolting. They can be threaded onto a new or existing bolt, stud, threaded tie rod or shaft. With Superbolt® Tensioners, bolting is fast, safe, easy and accurate - only hand tools are required!

Superbolt® vs. Hydraulic Wrench: With a hydraulic wrench one would need 18,925 ft•lb of torque to stress a 3" stud to 428,400 lbs using a hex nut. With a 3" MTX Supernut, only 114 ft•lbs on each of the jackbolts is needed to produce the same bolt load!

We have solved many bolting problems in the mining industry - you can find several case studies using the navigation to the right. We look forward to working with you!