Superbolt recently introduced a new tamper-resistant jackbolt design. The tamper-resistant jackbolts are a product improvement for Superbolt's multi-jackbolt tensioner (MJT) bolting system and is intended for use in security-sensitive applications.
Tamper-resistant jackbolts are designed to protect MJTs from unwanted tightening and loosening. They utilise an abnormally shaped head set in a counter-bore hole, which requires a special tool attachment to torque the jackbolts.
Multi-jackbolt tensioners dramatically reduce the overall torque required to load or unload bolted joints. Only small hand or air tools are required to achieve even extremely high preloads on any size tensioner. They eliminate the need for time-consuming, expensive and unsafe bolting methods.
The new tamper-resistant jackbolts make the MJT system ideal for applications where the user wants to keep the benefits of using MJTs without worrying about unauthorised loosening of the joint, such as on oil pipelines.
To install the MJT system, the nut or bolt is first threaded on hand-tight. The small-diameter jackbolts are threaded through the nut body or bolt head and thrust against a hardened washer to generate clamping force on the joint. This greatly reduces the overall torque required to tighten the joint in comparison to standard hex nuts. Because only hand tools are used, MJTs greatly increase safety and time efficiency over other common bolting methods.
Superbolt, based in Carnegie, PA, has been developing several new technologies in an effort to continually improve and simplify bolting practices.
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