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Bolts stretch when you tighten them. The important thing is having enough clamping force before the bolt starts to permanently deform or breaks (although some fasteners are designed to yield permanently at torque spec).
The OEM "16 mm" bolts are still M14 bolts, just with an enlarged shank. The threaded section is the same size and so are the torque spec and resultant clamping force. The larger bolt will stretch slightly less.
Last edited by jamal; 05-24-2019 at 11:17 PM.
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