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[Spiderbite]

I have simple request; can someone measure the exact ID and OD dimensions of thick-walled PETG, 1/2" ID. I am sure its not exactly 1/2", but I don't have some to measure. Mcmaster states that the tolerance is ±0.01", but I want to be sure I don't have the wrong dart fit. Thanks.

[roboman]

A ±0.01" tolerance means that the ID of an acceptable piece of tube can be anywhere between .490" and .510". If you want someone else to measure a different piece of tube for you, their measurement is going to be somewhere in between those two limits, and likely not the same as the stuff you'd get if you order it. In my experience you can expect it to be closer to ±0.005", but it still varies between batches (enough that I switched over to the aluminum equivalent, which still isn't great, but is better).