Threaded Cast Iron Hubs??

Do they exist? I came across a 1-1/4" brass male adapter today that goes into a CI hub. The brass fitting has hex wrench flats which I think mean it is threaded into the CI. I need to change to 1-1/2" male adapter. This is difficult to really see due to surrounding drywall. The brass fitting would not yield to channel locks nor pipe wrench. Currently applied penetrating oil and will let it sit for a day or two. I have never seen a threaded CI hub. Building was built in the 1980's.

 

I have never seen a threaded cast iron fitting.
If you have some type of 1-1/4" Copper tubular stub out, here's a Fernco fitting that adapts 1-1/4" copper to standard 1-1/2" ABS or PVC.

https://www.fernco.com/dimensional-drawings/3001-1125

 

Thanks Brian. This is a remodel that removes a pedestal sink with 1-1/4" trap and waste arm. The replacement sink is IKEA which is all 1-1/2", so I need to change male adapter in the wall to 1-1/2. I warned them not to use IKEA, because I am now 3 for 3 lifetime on encountering problems with their plastic tubing. I'll cut away some drywall today to try to see if the brass adapter is leaded into the CI. The wrench flats were making me hope it was threaded. Leaded joints are outside my skill set. Worst case I'll cut the CI inside the wall and couple with a Mission to ABS.

 

That's the best case if you get paid for it. Old cast iron tees in the wall have a steep drop off (with buildup) and replacing them with ABS will improve the drain flow greatly. Clogs are a thing of the past after that.

 

Absolutely there are threaded cast iron hubs in 2 inch and smaller sizes. Often used with a threaded plug for a cleanout in a branch drainage line or, as in this example, when using a trap adapter at a sink. I will state that I have never seen one with a 1-1/4 inch thread so you MIGHT have either a bushing in it or (more likely) a 1-1/2 inch male thread-to-1-1/4 inch trap tubing adapter.

As for removing it...worst case is cutting it off on the CI side of the hex and then collapsing it with a hammer and chisel.

 

They're called screwed cast-iron or Durham fittings, and you usually see them with galvanized pipe.

 

I completely forgot about galvanized nipples into cast iron
The cast iron thread depth is rather shallow and pretty easy to clean up and tap if needed.
You can use a tap or just use a short pipe nipple to clean up the threads, screwing it in and out.
In the past I used brass nipples and would still recommend it but they are expensive.

 

Thanks all. Been busy and away from the board for a few days. This brass male adapter is most likely threaded and is 1-1/2 x 1-1/4. It would not yield to a pipe wrench after many days of penetrating oil. Homeowner did not want to cut wall and splice in ABS, which would have been very easy. I was able to reduce the the 1-1/2 IKEA tubing to 1-1/4 to enter the wall. I hate it and warned him of all of the pitfalls, clogging, leaking, etc. Also told him to save all of the IKEA unique parts so that we can at a later date do the job properly.