Too many bastard 3/8 10 before you even deal with 3/8 11.
My tap only needs .295" sized hole.
There are also two kinds of 3/8 10 flat bottom floating around.
BCM's version has a smaller minor.
There are a few 3/8 11 as well.
The SW is less than .308 minor, but the most commonly used one has .308.
I didn't want to deal with that . Mine has a true .3125 minor.
Sugar Tree's 3/8 10 has a true .3125 minor as well.
Barenbrugge's 3/8 is actually a little smaller .
In a perfect world, all 3/8 screws would have a .3125 minor .
Of course, they are really not 3/8 because they are some .381" major.
Don't forget the delightfully quirky 3/8-11.5









