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Normally when I use a carriage bolt with wood I will use a torque washer.
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Today I went looking for ones for 3/8" bolts and was shocked by the price. I have had problems with carriage bolts holding (not turning) with plywood or MDF.

I was wondering if I coated the square shoulders with either J-B weld or epoxy and tightened down the bolt would that hold?
 

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Not sure I understand the issue, I've driven tons of carriage bolts over the yrs and never had this problem, and until this moment never knew about carriage bolt washers.

If I use a 5/8" carriage bolt I drill a 9/16" hole and hammer the bolt in. The threads and square imbed in the wood and the bolt does not turn when the nut is tightened.
 
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