Bolts in 'slip-critical' (HSFG) connections resist load by:
Choose the correct answer
Shear in bolt shank (bearing type)
Friction between contact surfaces (clamping force × slip factor) — no bolt shank shear at service load level
Only bolt tension (no friction used)
Adhesive bonding between connected parts
Correct Answer
B. Friction between contact surfaces (clamping force × slip factor) — no bolt shank shear at service load level
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HSFG (High Strength Friction Grip) bolts: (1) Tightened to proof load (creating high clamping force); (2) Friction between contact surfaces transfers shear load (under service loads, no slip occurs); (3) If slip occurs: bolts then bear. Advantages: no slip at service → good for fatigue, vibration, reversal. Design: resistance = μ × N_b (μ = slip factor ≈ 0.45 for clean-blasted surface, N_b = bolt tension). IS 4000 covers HSFG.
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