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My tub's drain flange has had the little cross piece inside it broken out, which means I cannot screw a grid drain into it. Right now, it's totally open and an invitation for my toddler to drop stuff down. Not to mention lots of hair, etc.

I believe I need to replace the drain flange and put a grid drain on top of that (I want a grid drain like a shower instead of a typical tub stopper).

"Drain flange" terminology from this image.

"Drain flange" terminology from this image.

I have measured the diameter across the drain at just under 2" which I believe means a pipe thread size of 1.5" (from http://www.plumbingsupply.com/pipethreadsizing.html). However, I thought I remember learning that drains may be either coarse or fine threaded.

Before removing existing drain flange, is there any way to know if it is coarse or fine threaded, or are all 1.5" drains the same as far as thread count goes? I want to be sure to order the correct part, whether I do the work or hire a plumber.

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I have never come across flanges that weren't compatible, and haven't seen manufacturers specify TPI on their kits or replacement parts. There are plenty of oddball pieces here and there but upon coming across those (on rare occasions), I'd be replacing the entire assembly.

There is really no way to know the TPI without removing the flange, but chances are you will be dealing with coarse threads.

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There's probably an American vs Metric thread version of these things. Not likely to be a problem if you buy in the tub's country of origin. –  Wayfaring Stranger Nov 11 '13 at 18:00
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