On 6/28/2019 4:33 PM, M. L. wrote:
I have chrome shelving kit pipes with 3/8" threads that I'd like to use
for inserting casters instead of the levelers it comes with. I have some
1/4" thread casters lying around and would like to find a way to use
them with the 3/8" threading. Is there such a thing as a 3/8" to 1/4"
threaded reducer for casters? TIA.

You might find a "thread insert" somewhere that does it.