Ingmar Relling Westnofa Chair Missing Screws  

Yeah, those are almost certainly unique custom fasteners. I'd get out my dial calipers and poke around the McMaster-Carr site to see what might be jury rigged and put the originals on the front of the chair. Worst case, you can always through-bolt the rear to make the chair useable. A machine shop could always make accurate-enough replacements, but at a cost...

FWIW, I think what you'd need are a pair of "socket nuts" (my new nom-de-web) of the proper dimensions and a section of threaded rod to join the two.

It is probably not the same size as what you need but I had used a similar threaded tension receiver hardware for cable railing like from this site.

https://www.stairsupplies.com/product/level-tension-kit-vr290/?gclid=EAI...

Thanks so much tktoo and minimoma for your input! Very helpful!

https://www.boltdepot.com/fastener-information/Type-Chart.aspx

It will not be an exact match either but I wonder if a correct size socket screw (see attached) can be used as a substitute piece to hold the tubes and wood(?) together? Or maybe a correct size coupling with a correct size threaded part work too as a temporary substitute?

I would look for a standoff or extension tube or something of the nature. It would need to be the right diameter and have the right internal threads for that threaded rod. Then for the screw head, I would look for a screw with the right hex head and threads to go in the other end of the extension tube.

With some luck and looking around on the internet you can cobble together those pieces. Again with luck those head diameters and tube diameters will be just right for off the shelf parts, or close enough.

If you absolutely have to, it might be possible to find thread adapters, or you can get a steel tube with the right thicknesses, and a tap set at the hardware store and cut your own thread (this is actually very easy to do).

Hi, sorry to resurrect an old thread. Did you find something that works for this chair? I'm in the same boat.