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3/8" Stud Bolt removed from Permanent Income Hypothesis, in the Fortress.  These bolts can be quite strong in 4,000 psi rock; however, there is no way to know how well the bolt has been placed and how much expansion has been achieved.  As a result, these bolts vary wildly in pull-out strength from one placement to the other.  In soft sandstone, these bolts are scary.
ID 105925927

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Matthew Fienup
Mar 2, 2007
3/8" Stud Bolt removed from Permanent Income Hypothesis, in the Fortress. These bolts can be quite strong in 4,000 psi rock; however, there is no way to know how well the bolt has been placed and how much expansion has been achieved. As a result, these bolts vary wildly in pull-out strength from one placement to the other. In soft sandstone, these bolts are scary.  
Benjamin Chapman
Small Town, USA
Benjamin Chapman   Small Town, USA
Wow...that's very special. Thanks for the heads up Matthew. Also, thank you for pulling all that old hardware. Nov 4, 2016

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