Where to buy 45/64 bit for 1/2-inch NPT Thread Tap

Steve Garson · February 2005

I just bought a tap at the local plumbing supply house and am amazed to find that almost no one sells the 45/64-inch bit that it requires. Even online! Am I missing something?

What size bits do you guys use when you need to tap a 1/2-inch hole?

Lurker_2 · February 2005

re

mscdirect.com

also if there is a good industrial supply house, or a real hardware store around, they will have one.

jim murtaugh · February 2005

drill bit

grainger has them

jim lockard · February 2005

11/16

would be the same real close to 45/64 . best wishes J.Lockard

Mike T., Swampeast MO · February 2005

45/64 is definitely out there in many varieties. HSS and exotics in normal drill bits of full-size and reduced shank, router bits and even high-precision masonary bits for drilling bowling balls!

Vermont American makes the regular drill bits, but doubt that they're considered "common" stock in most places.

dennis_kings · February 2005

drill bit

must have your numbers wrong. 45/64 is almost 3/4" Can't run a 1/2 tap through a 3/4" hole. Maybe 25/64 or close to that? Anyway Grainger will have them.

tony the tech · February 2005

Drill bit

45/64 (.7031) IS the correct tap drill size for a 1/2-14 NPT hole. We use an 18 mm drill (.708). It works fine (we make hundreds of 1/2" NPT holes in steel pipe every day)

Carl PE · February 2005

Have you tried..

Enco ?

I order stuff from those guys all the time. Usually get it in a day or two.

They have it for $2.99.

jim lockard · February 2005

The outside

of the pipe Dennis. 7/8" is the outside diameter +/-. Best Wishes J.Lockard

ed_25 · February 2005

Fastenal

Do you have a local fastenal?

Wayne_12 · February 2005

7 corners hardware

7 corners hardware in St. Paul, Mn. They have more in that store than most tool warehouses. www.7corners.com

Where to buy 45/64 bit for 1/2-inch NPT Thread Tap

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