The 'high strength friction grip (HSFG) bolt' connection transfers shear by:
Choose the correct answer
Bolt shear through shaft (bearing type)
Friction between contact surfaces due to bolt pre-tension — no slip occurs at working load
Adhesive bonding
Welding at the contact surfaces
Correct Answer
B. Friction between contact surfaces due to bolt pre-tension — no slip occurs at working load
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HSFG bolts (IS 3757): pre-tensioned to a prescribed proof load (approximately 70% of UTS). Shear transferred by FRICTION between clamped surfaces. No slip at working load → joint stiffness = rigid. Fails only when friction is overcome (slip) and bolt bears. Superior to ordinary bolts for: fatigue, reversing loads, vibration. Treated surfaces increase slip factor.
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