Applying the right amount of torque to fasteners can be problematic; too much and you break the bolt or nut, too little and the system lacks stability (at the least). A fastener system from HYTORC promises to change that. Its HYTORC® Clamp-Nut™ system – torque wrench, driver and Clamp-Nut – eliminates damage because no torque is transmitted to the bolt. Since all components are in a managed force flow, preload losses are negligible.
Functioning as a mechanical tensioner, moving the outer sleeve of
the fastener in a clockwise motion causes the inner sleeve to push
upward, rising with the bolt. The action provides an accurate, gentle
cold stretch without residual load loss. The result is pure tensile load
and an ideally tensioned fastener.
The three-piece fastener includes an inner sleeve, outer sleeve and a washer. The hardened surface in the inner sleeve and the washer prevent galling. The geometry of the three-piece design lets the fastener safely bring increased mechanical tensioning to high loads.
The fastener functions as a mechanical tensioner while eliminating bolt over-stretching and highly stressed tensile pullers. Using a HYTORC driver and torque tool configuration, moving the outer sleeve in a clockwise motion causes the inner sleeve to push upward, rising with the bolt. This action provides an accurate, gentle cold stretch without residual load loss. The result is pure tensile load and an ideally tensioned fastener.
The system is hands-free, so it does not have a reaction arm typically used in conventional hydraulic fastener torque applications. With the Clamp-Nut, you place the tool on the fastener (even if inverted), stand back from the application and then operate the pump from a safe distance.
It eliminates 100% of galling on flange and stud surfaces. It is available in all thread forms, with low, standard, medium and high temperature ratings available. Standard Clamp-Nuts have a load range that extends to 1.5 million pounds; unit sizes extend from 1-½ to 7 in.
Filed Under: Aerospace + defense, Fastening + joining • locks • latches • pins