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Using 12 mm bolt in 1/2 inch drilled hole
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My buddy put up some anchors and used a 1/2 inch drilled hole, but then only had 12 mm bolts and assumes that they are close enough for safety, but i wanted to make sure and ask you guys. Thanks for the help! |
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If they're glue in bolts that's fine. It's they're mechanical bolts then definitely not. |
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+1 for mechanical bolt absolutely not! |
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Would be great for more info on the bolts. I assume they are wedge 12mm bolts? Would love some photos too - since the stud is likely a ways out of the hole to get the expansion needed. |
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Yes mechanical wedge bolts. Ok great to know, ill tell him to get those out asap! |
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Fyi team tough has 12mm bits for decent price. |
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Haven’t there been documented failures because of this exact situation? I want to say a fatal accident in Australia but I can’t really remember. |
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Not OK at all, 1/2" is 13mm (actually 12.8, but 13mm is a rough approximation). Did the bolts even start to snug down when tightened? Seems unlikely unless his 1/2" bit was super worn down. Pulled a 12mm Petzl Long-life out of a 1/2" hole in Joshua Tree one time - just wiggled it out with a nut tool. |
timothy fisher wrote: Team Tough is great! Lately I have been using these 5-sided bits from Extreme Gear. A few dollars, but I have had them last 2-3 times longer than the equivalent 2-sided chisel style! https://www.extremegear.org/shop/p/rocket-5-sds-plus-drill-bits-projahn |
highaltitudeflatulentexpulsion wrote: You might be thinking of this accident? Raumer 8mm wedge anchors placed in notoriously soft sandstone, and possibly drilled with a bit larger than 8mm. http://www.supertopo.com/climbing/thread.php?topic_id=772824 |
