The bolt is threaded at both ends and has a tapered shank.
An expansion sleeve with a corresponding tapered bore fits
over the shank. Two nuts complete the unit.
The outside of the sleeve is cylindrical and dimensioned for
an initial clearance fit in the bolt hole corresponding to 0,05
to 0,l5 % of the bolt hole diameter. There is no high surface
finish requirement in the hole. Normal boring is sufficient.
The bolt is inserted into the hole by hand. The sleeve is
expanded to a radial interference fit by drawing the tapered
shank into the tapered bore of the sleeve. The bolt is then
tensioned against one nut while the other nut is hand
tightened. A pre-load is exerted on the bolt by releasing
the pressure on the tensioner.