Hydraulic pressure is applied simultaneously to each Tentec Nut. All frictional factors connected with conventional bolt tightening methods are alleviated since Tentec Nuts apply a direct axial force to the bolt which generates a bolt elongation.This elongation/tension is permanently retained by means of the load retaining collar.
Tentec Nuts have been designed to be as compact as possible, in order to allow adjacent fitment on as many applications as possible. In most cases they are designed to produce a residual bolt stress of 45000 lbs/In2 (310N/mm2) which is more than adequate for most bolted joint applications. As pressure is applied to the Tentec Nuts not only does the bolt elongate but also joint compression occurs.
Since many applications incorporate some form of gasket, this joint compression can be substantial, in order to withstand this joint compression all Tentec Nuts are capable of considerable piston movement. This allows the Tentec Nuts, in most cases, the ability to tension a complete joint in only one pressurisation sequence, this can result in extremely high time savings.