0 votes 0 votes Pre-tensioning of a bolted joint is used to strain harden the bolt head decrease stiffness of the bolted joint increase stiffness of the bolted joint prevent yielding of the thread root Machine Design gateme-2018-set2 + – Arjun asked Feb 17, 2018 • edited Jan 15, 2020 by go_editor ♦Arjun 28.5k points answer See all 0 reply