DGA

In the hydraulic torque-controlled tightening method, the torque tool stops when reaching a pre-set torque, or signalizes that it has reached the target torque. For this method, it is very important to know the friction details.
The friction behavior is influenced by both the lubricant
and the quality of the components and their surfaces.
To make sure that no inaccuracies in the torque are added to the scattering of friction, HYTORC developed especially precise torque tools. With hydraulic torque tools, differences in the tightening torque result mostly from the change of the lever arm during tightening.

The drive pawl optimizes the direct preload transfer to the bolt via the set torque. The drive pawl also significantly increases the fastening speed of HYTORC’s hydraulic torque wrenches. As the tightening torque increases directly when the hydraulic pressure increases, the bolted joint is preloaded in steps. The entire tightening process for each bolt can be documented with the Eco2TOUCH.

The fastening elements DISC, zWasher, CLAMP, tension nut, SmartSTUD and justBOLT even enable axial tightening with no lateral force with a preload accuracy of ±5%.
The torque-controlled tightening method is suitable for all bolted joints up to torques of approximately 200,000 Nm. The torque calculations define suitable lubricants to prevent seizure or fretting. It should be used for applications on flange connections as SIMULTORC assembly system with anti-turn washers to prevent damages on flange contact areas.