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Bolt Stretch and Loading.
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http://www.fbgauto.com.tw/Head_Bolt_3.html
Submitted by qq16797870 46 months, 2 days, 13 hours ago
Though head bolts seem to be pretty rigid fasteners, they are actually designed to stretch. Stretching a bolt is like stretching a rubber band. It allows the fastener to exert force against a surface to hold the parts together. This is especially important with gasketed surfaces because the gaskets have a certain amount of give that must be overcome by the fasteners to maintain a tight seal.
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