I came across this light bulb socket in a piece of furniture built in 1969 in America. It's 2014 and I'm in Britain so frankly I have no idea. It's right down inside the thing so this is the best photo I can get.

interior light bulb fitting

I've worked with American pieces before but I don't recognise this kind of fitting. It doesn't seem to be threaded as an Edison Screw bulb usually is. Any ideas?

  • 1
    Are you sure it's not threaded. Stick your hand down there to the ceramic part. It looks like a totally standard Edison base, if threaded.
    – Bryce
    Commented Aug 21, 2014 at 10:44
  • It does to me too but the inside surface of the socket is completely smooth. It's about the right size for an E27 but no threading and I was wondering if it might be something that has fallen into disuse. I was considering popping an E27/E26 in first and letting gravity hold it in but I don't want to risk it without an opinion. Commented Aug 21, 2014 at 10:56
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    What is the internal diameter of the socket? In what orientation is the fixture intended for use? Could it be intended for specialized use?
    – user23752
    Commented Aug 21, 2014 at 12:29

1 Answer 1


I've owned a light socket exactly like that one - identical in size to an E27 but totally lacking in internal threads. Mine was simply a manufacturing screwup - the rest of the sockets on the shelf, with the same product number, had the expected internal threads. I got mine all the way home and installed before I noticed the flaw. The store was quite happy to exchange it for a "real" socket that worked.

Replacing that socket with a normal threaded E17 socket is an easy job.

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