bolts 24 or by other fastener devices a bolt 25 with a head 26 a shank 27 and a thread 28 on the shank is threaded into fastener 20 tightening the bolt into a nut to be described holds the objects together when they are joined the torque on the bolt exerts through the threads an axial tensile preload force that tightly holds the objects together the release of the energy stored in the bolt will unless regulated exert a strong impact force on the entire structure fastener 20 includes a body 35 with a mounting flange 36 and a rising tubular housing 37 the housing has an internal thread 38 at its upper end a housing hat 40 includes an upper internal cylinder 41 and a depending skirt 42 with thread 43 engagable with thread 38 to hold the fastener assembled in condition for installation in a structure ready to receive a threaded bolt an access port 130 is formed through it for a purpose to be described base 35 includes an insert 44 with a central opening 45 to pass a bolt and a very smooth flat reaction surface 46 perhaps on an insert 47 a rotor 50 has a bottom flat reaction surface 51 which is intended to move in shear motion along reaction surface 46 the rotor further.