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Tensioning Gearbox

Tensioner Gearbox

Hydraulic tensioning is the ideal method for tightening bolted connections. Hydraulic tensioning eliminates inaccuracies and helps achieve correct bolt loading in critical connections. At HTI, we’ve been building hydraulic tensioners and nuts since 1986.

What is a Hydraulic Tensioning Gearbox?

The simplest (most cost-effective) hydraulic tensioners use a nut rotating socket, a component with an internal hex that fits inside of the Bridge and snugly around the Nut. A circular rod, or “tommy bar”, is inserted into one of the holes drilled in the socket to tighten or loosen the Nut.

The addition of a tensioner gearbox encapsulates nut rotation and provides an external gearnut to tighten or loosen the nut. An idler gear within the gearbox ensures that the direction for tightening and loosening with the gear nut is the same as the nut itself. 

Hydraulic tensioning gearboxes can also be used with multi-tensioner systems, such that all nuts in the same multi-tensioner assembly can be tightened or loosened with a single gearbox.

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Custom Engineered Tensioners Since 1986

HTI has been designing engineered solutions to your toughest bolt tensioning problems since 1986! You can choose from one of our standard catalog sizes above, or we can design a custom fixed tensioner for any application when a standard model won’t work. HTI tensioners can be designed for imperial or metric-sized studs, high loads, high temperatures, large stud sizes, or corrosive environments. Our multi-unit tensioning systems can make easy work of large bolted systems, and our automated tensioning systems can reduce labor and increase throughput in high-volume manufacturing applications. 

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If you have questions, comments, would like more information about our products, or want to get started designing your custom tensioning solution, please contact us and we will respond promptly.