What are the differences between flanges of different grades?
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Differences between class300 and class600 flanges
Check the standards yourself; the flange size, thickness, number of bolt holes, hole diameter, and the dimensions of the corresponding gaskets will all likely vary.
Flanges ranging from 0.5" to 3", with the same specifications for 300LB and 600LB
For the same diameter, it has a higher pressure rating, is thicker, and comes with more bolts