Inside threaded strainer basket

[PlumblocoBrett]

I picked up a used stainless steel sink, it has a strainer basket with inside threads. I do not understand the purpose of the inside threads as I can not find any strainers or other inside sink accessories that have threads! Does any body know the purpose of these threads?
Please understand that I am not referring to the under sink plumbing. I am talking about the strainer basket where a strainer would sit inside the sink.
Thanks for your help. Brett

 

[Reach4]

It could be to rotate the plate, with the holes in your picture, out for cleaning? Or at least used in the manufacture to avoid having to weld that plate in place? Just speculating.

 

[Sponsor]

 

[hj]

The external threads may have been "rolled" in which case there would also be "inside threads", but they have no function.

 

[WorthFlorida]

Possibly it allows the depth to be adjustable for different baskets types?

 

[PlumblocoBrett]

The external threads may have been "rolled" in which case there would also be "inside threads", but they have no function.

Hi HJ, you nailed it! I found one on the Oatey web side, and they confirmed that the threads are there because the outside threads are rolled. Therefore the inside threads serve no purpose!