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faucet hole in granite

stevethomas's picture

My customer had a granite counter installed by HD and the installer drilled a 1 1/4" hole for a custom faucet from HD which broke within a year, she now has a moen single handle and the center hole is too small for the fittings, screw mount and hose, how can i enlarge the hole to about 2". I don't have a diamond hole saw, could I use my Hilti hammerdrill set on low hammer action and drill a series of holes?

(post #107174, reply #1 of 11)

If you use the hammer drill, you will be shopping for a new countertop.

Starret makes something called an "Oops" holesaw arbor- it uses the smaller holesaw as a pilot bit. Maybe someone else makes one.

Don't know of many other options besides that and two diamond hole saws... or subbing out to a pro granite person.

I hope you get a signed waiver.

(post #107174, reply #2 of 11)

I'd be buying the right hole saw, and use a predrilled block of wood to get it started right.

Hammerdrill small ring of holes? Not on my life. Unless it was MY counter top. Cuz when it breaks, it will be YOUR counter top.

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(post #107174, reply #3 of 11)

2'' hole?  No kidding.  I don't think I've seen a kitchen faucet yet that required a hole that big. 

Now unlike some around here-I've not done thousands of kitchens.

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Remodeling Contractor just outside the Glass City.


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Remodeling Contractor just outside the Glass City.


(post #107174, reply #4 of 11)

I agree, don't recall seeing 2" holes in sinks. Even Moen made sinks come with 1 1/2" holes. However, I don't know that enlarging a 1.25" hole to a 1.5" is any easier than going out to 2", but I would guess that a 2" hole could cause some problems in mounting the faucet.

(post #107174, reply #6 of 11)

I would almost expect you could alternate the hoses/fittings and the mounting stem and stuff 'em all in there.  I remember having to play games a couple times.

A Great Place for Information, Comraderie, and a Sucker Punch.

Remodeling Contractor just outside the Glass City.


A Great Place for Information, Comraderie, and a Sucker Punch.

Remodeling Contractor just outside the Glass City.


(post #107174, reply #11 of 11)

thanks for responding, I bought a 13/8" diamond hole saw from Homies and made a jig, a little water and bing bang all done

(post #107174, reply #5 of 11)

What style of sink?

We run into problems with some faucets and cast iron sinks, the threaded portion of the faucet is not always long enough to make it through the countertop and sink.   Our plumber has always made it work though I couldn't say exactly how.

I've never seen a faucet that needed a 2" hole.  We always drill a 1 1/2" hole and I would bet your faucet would fit inside.  I would not want to drill a 2" hole in case somebody wanted to switch out the faucet down the road and they come to find out it won't work.  There is a chance other faucets would not have a wide enough trim to cover the 2" hole.

You need a core bit and an angle grinder to drill the new hole.  You can drill around the existing hole if you go in at an angle to set the bit in the right place.  With a steady hand it's not a problem.   The core bits we use do not have a pilot bit anyway.

I'd call a local granite shop and ask if they will sell you one of their bits.  There are places to buy them online though I've found most of the places are over priced so we buy direct from our fabricator.  You can expect to spend between 40 and 50.

what ever you do, DO NOT use a hammer drill.

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(post #107174, reply #7 of 11)

The only thing I know about Granite is that I dont touch it.

Having said that, could you possibly file the hole a little larger?


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(post #107174, reply #8 of 11)

  A Dremel or rotozip with a diamond drum bit along with a little H2O will enlarge that hole. Forget the hammer drill.

(post #107174, reply #9 of 11)

first i would cut a wood plug the size you have now,epoxy it into the hole,once dry,use a diamond hole saw the right size and drill slow with water. i'm like everyone else,1.5"  larry

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(post #107174, reply #10 of 11)

I am a fabricator and all I ever drill is 1 3/8" holes.

The one time a contractor insisted he needed a 2" hole despite my repeated responses that I had NEVER run across one, I drilled it only to get paid to come back out a week later and fill the 2" hole with tinted epoxy and redrill it to 1 3/8".

I think the best proof that 2" is unheard of is no one seems to make a self rimming sink with holes bigger than 1 3/8".

Do what sphere said with a hole drilled in a block of wood as a guide and buy an 1 3/8" diamond holsaw. I buy them for 35 or 40 bucks locally.