What is the hardness of thrust collar and for integral shaft with collar, how it is made ie specially hardened or not ? Preceding contribs ) 19 : 01, 18 November 2012 ( UTC)
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Pneumatic or hydraulic torque rolling devices with an expander ( consisting of a mandrel, cage with rolls, case assembly with a thrust collar ) are used to expand the end of the tube so it seals against the tube sheet of the vessel.
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