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What is the difference between fasteners, bolts and screws?

Fastener is a general term to describe something which is used as a restraint for holding things together or attaching to other things.

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What are the advantages of using high strength friction grip (HSFG) bolts when compared with normal bolts?

HSFG bolts have the following advantages when compared with normal bolts :

(i) The performance of preloaded HSFG bolts under fatigue loading is good because the prestressed bolts are subjected to reduced stress range during each loading cycle when compared with unloaded bolts.

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