Having then determined the amount of friction on the threads by partial tightening, it is possible to determine the final tightening torque so as to ensure that the bolt can be rotated through the necessary angle to ensure the desired preloading on the shank of the bolt. BAZZURRO ANDREA ...
A tightening bolt with accurate preloading has a first threaded portion 1B adjacent to its free end and a second threaded portion 1A of greater diameter and lesser pitch adjacent to or corresponding to its head T. A ring 2 is screwed onto the portion of greater diameter and in the tightened...
Snug-tightening the bolts induces small clamping forces in the bolts. In general, at the snug-tight condition the bolt clamping forces can vary considerably because elongations are still within the elastic range. For bolts equal to or greater than about ¾ in. dia., snug position provided ...
L03_Bolt Pretension
“shortening” movement of the deformable member relative to the tensile member occurs at the distal end of the rock bolt; as a result, tightening of the rock bolt need not cause an increase in the distance by which the proximal end of the tensile member projects from the rock face. ...
tightening procedureIn modern steel constructions the use of stainless steel becomes more important, especially in corrosive environments where stainless steel is superior to carbon steel. So far, the use of stainless steel bolting assemblies for preloading in those constructions is not permitted ...
of the end of the thread (4) of the threaded bolt (2) relative to the cylinder (5), and characterized in that the threaded bolt tightening further comprises: a judging device ( 11) for determining the residual actual screw tension after the pressure discharge device threaded bolt tightening....
L03_Bolt Pretension
This prevents the housing being damaged due to overtightening of the bolt. The damage to the housing can be prevented also by means of a smaller diameter neck 38 (FIG. 3) in the bolt 20 instead of the hole 34; however, in this case the braking torque value is larger. FIG. 3 ...
said bore threads of uniform leads mating without interference with said bolt threads over said first portion of said bore when said nut is threaded on the bolt and advanced in a tightening direction by rotation of the nut, said bore threads of decreasing lead producing progressive interference wi...