My wife wants to know. Her sister has a giant bag of them. She thought I would know, but I don’t. itemitem

The outside diameter of the finely threaded side is 27mm.

  • 1/2" EMT compression, to-box connector, with a UL stamp and a plastic insert; suitable for exterior.
    – Mazura
    Commented Nov 21, 2021 at 1:18

1 Answer 1


They are box connectors for EMT conduit which is used to carry electrical wires.

  • 8
    EMT is Electrical Metallic Tubing, commonly called electrical conduit. The photo is of a fitting that attaches an electrical conduit to a junction box or distribution panel. The coarsely threaded side screws into the box. The band slips over the end of the conduit under the knurled nut, the end of the conduit is inserted into the rest of the fitting, then the nut is tightened over the fitting to compress the band and secure the end of the conduit in place.
    – Suncat2000
    Commented Sep 23, 2021 at 19:44

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.