Drill bit size for tap
 

Need to know what size drill bit to use with an 8mm x 1.25 tap, on the package for the tap it says to use drill bit "H"...what the ---- does that mean lol?

Re: Drill bit size for tap
 

google that ----.

Re: Drill bit size for tap
 

Re: Drill bit size for tap
 

I googled that ----

http://www.efunda.com/DesignStandard...ewm_coarse.cfm

Maybe "H" = 6.80?

Re: Drill bit size for tap
 

use a 17/64 and go slow with the tap

H = .266
17/64 = .2656