Is that the same thread as on AKG 240's?
I have a pile of them in parts cabinet in my workshop and there are several different size threadings and spacing. Some don't work at all on some sets of phones and some work with the mono cancellation effect you can get with mis-aligned contacts.
So by no means are these a standard.
I just lop off the 1/8" and put on a proper Neutrik 1/4" TRs connector for all my production and studio headphones. In all the workboxes and FOH racks there's a pigtail type 1/8" to 1/4"F adaptor if something with an 1/8" needs monitoring. They hardly ever get used anymore. Mobile devices are mostly bluetooth now and for critical uses I go with a proper USB interface or DVS.
My main headphones now are by Sony and they do bluetooth noise cancelling for personal listening but have a detachable cable that allows bypass of all the internal electronics for cabled usage -with the earspeakers driven directly from that cable (which has a permanent 1/4" on it now)
