Square Holes In Plastic Planks

Carriage bolts provide a finished look but require a square hole for the shank under the head. I found two ways to form this square hole in composite material.

If you are interested, please, click here

Your comments are welcome. All of us are smarter than any one of us.


Thanks,

Rick

I think you meant 1/4-20 not 1/2-20 for the F drill bit typos are easy trust me I do a lot of them

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Originally Posted by Frank S

I think you meant 1/4-20 not 1/2-20 for the F drill bit typos are easy trust me I do a lot of them

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Good catch. It is fixed now.

Thanks,
Rick

Good work Rick. I have nothing of value to contribute, so I'll post a stupid video that you reminded me of.

https://www.youtube.com/watch?v=cUbIkNUFs-4

Somewhere in the dark corner of my memory I have an image of a specialty washer made just for carriage bolts. It had a square hole in the center and 4 spikes around the edge similar to the tee-nut you used. Put the washer on the bolt and insert in the wood plank. Tap the head of the bolt to start the spikes and as you tightened the bolt it pulled the washer flush and prevented spinning.
I've never seen these in a store, but have wished I had an assortment of sizes on hand from time to time.

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Originally Posted by piper184

Somewhere in the dark corner of my memory I have an image of a specialty washer made just for carriage bolts. It had a square hole in the center and 4 spikes around the edge similar to the tee-nut you used. Put the washer on the bolt and insert in the wood plank. Tap the head of the bolt to start the spikes and as you tightened the bolt it pulled the washer flush and prevented spinning.
I've never seen these in a store, but have wished I had an assortment of sizes on hand from time to time.

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Amazon has them...

https://www.amazon.com/Hillman-29030...66&sr=8-1&th=1

https://www.amazon.com/Everbilt-Anti...s%2C166&sr=8-7