Most likely, there is no problem buying such a screw. The type of screw is called a set screw. What you need to know is the dimension of the thread. Measure the outer diameter and the thread pitch, i.e., how far it is from one peak to the next in the thread.
There are a number of different types of threads in the world. If the screw is for any part of the towel rack's fixture, it is likely M-threaded, and the outer diameter will then be just under some whole mm. If it is for any part that contains liquid, it is not impossible that it is an inch-tread. Then the outer diameter is instead close to an inch measurement.
Measure the screw, preferably with a caliper if you have one, and look in thread tables, or post the measurements here in the thread, and you will surely get help.
Here is a table with stainless steel set screws:
http://www.wiberger.se/templates/din914-stoppskruv-insex-spets.htm
I assume you can live with it being Allen instead of Torx. You probably can't buy one set screw from Wiberg, but go to a proper hardware store, and they can surely get a screw for you.
There are a number of different types of threads in the world. If the screw is for any part of the towel rack's fixture, it is likely M-threaded, and the outer diameter will then be just under some whole mm. If it is for any part that contains liquid, it is not impossible that it is an inch-tread. Then the outer diameter is instead close to an inch measurement.
Measure the screw, preferably with a caliper if you have one, and look in thread tables, or post the measurements here in the thread, and you will surely get help.
Here is a table with stainless steel set screws:
http://www.wiberger.se/templates/din914-stoppskruv-insex-spets.htm
I assume you can live with it being Allen instead of Torx. You probably can't buy one set screw from Wiberg, but go to a proper hardware store, and they can surely get a screw for you.
I see that Biltema calls them lag screws.
But they only seem to have an assortment box with screws
http://www.biltema.se/sv/Bygg/Fastelement/Sortimentlada/Ovrigt/Lasskruvsats-150-delar-191080/
But they only seem to have an assortment box with screws
http://www.biltema.se/sv/Bygg/Fastelement/Sortimentlada/Ovrigt/Lasskruvsats-150-delar-191080/
