tap drill size, and clearance hole size.<br><br>i've found some charts online that i can print out, but i'd like to have a handy little reference card thingie... i'm probably just not searching ...

I quickly calculate proper tap-drill diameters using this simple formula. Tap-drill diameter equals nominal diameter minus thread pitch. For example, drill size for a 3/8-16 thread is 0.375 0.0625 ...