Structure and principle
The top nut assembly consists of round nuts and several top screws and a hard pad, which can be used directly to replace the traditional standard six angle nut. Screw it on the bolt, stud or threaded rod, shaft, the main screw bolt / stud nut placed on the hard flat pad. After the round nut is in place, the actual tightening of the bolt / stud will tighten the top screws around the main thread by the hand tool.
(1)By tightening the jackbolts,a strong thrust(axial)force is generated.This thrust force is directed against a hardened washer.Jackbolts against a hardened washer.Jackbolts have a small
friction diameter and can therefore create a high thrust force with relatively little torqut input.
(2)The loads are transferred through the nut body which is postitioned on the main thread by hand.
(3)A hardened washer is used to transfer the force while protecting the flange face.
(4)The thrust(axial)force of many jackbolts and the opposite reaction force of the main bolt head create a strong clamping force on the flange.
(5)The thrust(axial)force from the jackbolt creates an equally
strong reaction force in the main bolt