Drill bit size for 1/8" NPT threads

06-25-2004, 01:47 PM

Dumb Ass Vette Moderator

Thread Starter

iTrader: (20)

Join Date: Jun 2002

Location: Colorado

Posts: 4,279

Likes: 0

Received 1 Like on 1 Post

Drill bit size for 1/8" NPT threads

Need to tap some hole, but I want to be drill the hole the correct size. TIA

06-25-2004, 02:18 PM

TECH Addict

iTrader: (4)

Join Date: Nov 2001

Location: Sugar Land, TX

Posts: 2,485

Likes: 0

Received 0 Likes on 0 Posts

21/64 (.328 diameter)

06-25-2004, 03:09 PM

TECH Fanatic

iTrader: (9)

Join Date: Jan 2002

Location: DFW

Posts: 1,245

Likes: 0

Received 0 Likes on 0 Posts

I just finished tapping my intake for my Direct Port Nozzles, and it called for a 5/16 drillbit