The best size drill bit for 1/2″ NPT tap is a 23/32″ drill bit.

What size drill bit do I need for a 1/2 bolt?

Use the same size drill bit as the diameter of the bolt. If you are using a 1/2″ diameter bolt use a 1/2″ drill bit.

What size is a #35 drill bit?

Jobber Length Drill Bit: #35 Drill Bit Size, 1 1/2 in Flute Lg, 7/64 in Shank Dia. Country of Origin USA.

Is 3/8 drill bit the same as 10mm?

bit, though. 3/8″ bits have a nominal size being just ever so slightly under 10mm. You can’t drill a hole of any size and put something in it the same size. It must be a bit smaller than the hole you drill.