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A bolt that holds the kitchen sink drain "basket" to the sink basin has broken and caused water to leak between the sink and the drain. What is this part called?

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Also, any ideas on where I can find it in Canada? So far what I've seen for sale are only entire "sink strainer" assemblies, when I just need that bolt.

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    Any bolt of the correct thread pitch would work. I'd suggest taking it to your local hardware store and browsing the selection until you find one that matches. I would recommend stainless steel so it doesn't rust and/or get nasty looking. Galvanized steel would be a second place. Bare steel would be a very distant 3rd, and I'd invest in a box of them so you can replace them when they start to look nasty.
    – FreeMan
    Apr 23, 2021 at 18:31
  • @FreeMan Taking it to local store might be difficult right now, depending where in Canada OP is. Quite a few places are in lock down again.
    – crip659
    Apr 23, 2021 at 18:47
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    I would go stainless or brass, galvanized steel in a drain the zinc won’t last long acidic fruits and vegetables or even things like pickle juice will remove the zinc.
    – Ed Beal
    Apr 23, 2021 at 18:57
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    Google does bring up bolts that look like that if search for 'sink strainer bolts'. If you know make of sink, then might be able to find right size bolt.
    – crip659
    Apr 23, 2021 at 19:14
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    I don't think it is worth finding a replacement, which can be costly. IMO, replace the whole set is more realistic then. I believe the strainer is operated through the hole in the middle of the shank, is that correct?
    – r13
    Apr 24, 2021 at 0:39

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Any bolt of the correct thread pitch would work. I'd suggest taking it to your local hardware store and browsing the selection until you find one that matches. I would recommend stainless steel so it doesn't rust and/or get nasty looking, brass would be a good alternative, though it wouldn't match in terms of color. Galvanized steel would be a second place. Bare steel would be a very distant 3rd, and I'd invest in a box of them so you can replace them when they start to look nasty.

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    Thanks, the only downside of this to keep in mind is that the strainer no longer fits as it used to clip into the hole of the original hollow bolt. Other than that, it is a cheap and simple solution compared to purchasing a whole strainer assembly. Unfortunately the original bolt hasn't been easy to find.
    – adatum
    Apr 26, 2021 at 17:52
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A standard M12x40 bolt from a hardware store did the trick. 35mm would be fine as well.

https://www.albanycountyfasteners.com/blog/wp-content/uploads/2017/08/20170811_144120-768x787.jpg

One compromise is that since the center is not hollow, it will block the original strainer from seating properly. Still, at <$2 this solution is 10-20X cheaper than buying a whole strainer assembly.

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