plumbing
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?
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.
I would call it a slip x spigot brass drain street ell. Can't say I've seen one until now. More common is the double slip brass drain ell. Hard to say from a photo, but looks like a short horizontal straight piece could be inserted if you had to use a double slip ell. Perhaps the trap U could be rotated away a bit to buy a little extra distance for this.
I don't know the name of this type of sink or faucet configuration.
If you are already expecting to re-use the cap, you may be able to find another faucet that will work with it. There are a number of one-handle kitchen faucets that are now designed to be installed with or without a wide base. For example, the Moen Essie faucet
You may be able to take a faucet like this and mount it on top of the existing cap.
Best Answer
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.