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I'm thinking about getting some confirmat screws for 3/4" material. Should I get the 40mm or the 50mm variety?

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What are you mounting the 3/4" material to? – trip0d199 Feb 2 '11 at 18:38
It's just a box with 3/4" MDF screwing into the edge of another piece of 3/4" MDF. – joeforker Feb 2 '11 at 19:10
up vote 1 down vote accepted

According to this supplier 7x50 is for 3/4" materials and 5x40 is for 1/2" materials.

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