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General Climbing Discussion

Topic Date User
SS Coachscrews at Bunnings - Are they ok? 29-Jul-2014 At 2:48:21 PM Reluctant
I had this problem on a large construction site where we did thousands of fixings. Buy your coach bolt/screw from somewhere other than bunnings. We did random sample tests of 20 screws from differing suppliers. Best comparison for quality was weight. Cup and cone failure just under head even at low torque was common in cheapest bolts. We determined that with cheapest bolts 20 - 30% of bolt heads would have their strength (elastic limit) reduced during fixing with little outward signs and hence not comply with fixing specification.
Grooving of machine bolts also introduces stress concentrator s and if done poorly localised heat stress.
My view -,pay more for quality coach screw with wide thread from fastener dealer and not a general hardware warehouse.

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