Drill bitt

[Anonymous-0]

What size drill bitt do I use for 5/16 tap?

 

[IaGary]

Size F is what I use.

Gary

 

[glennster]

here is a link to a chart for bit sizes for taps.
poke here

 

[Kentb of SWMO]

Size "F" which if my carbon based RAM is working tight is .257 inchs.

Kent

 

[Walt Davies]

NC or NF enquirering minds need to know???
Walt

 

[Don-Wi]

If you don't have a F drill, you can use a 13/64 drill and it'll turn out just the same.

Donovan from Wisconsin

 

[Dave_Id]

Rule of thumb. Tap drill size= diameter minus the pitch.

 

[Anonymous-0]

That's 17/64 Don. 13/64 is used for 1/4 -20

Areo

 

[dave guest]

Drill press or shaky hand? Makes a difference. Use chart for a start, then make up your mind. If hold is too big, will strip out. If too small tap may break or become too tight to turn.