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.