pipe threads with teeth?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Husky Dad, Sep 20, 2009.

  1. Husky Dad

    Husky Dad New Member

    Messages:
    6
    Location:
    Georgia
    Im installing a rubinet wall mount faucet. The 1/2 male thread pipe that comes out of the back of the faucet ( for wall connection) has teeth or smaill grit made into the thread. Got any info on what this type of thread is called and its purpose? I'm thinking its to give a good grip without having to completely seat the fitting. Any help would be appreciated. H D

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    Last edited by a moderator: Sep 20, 2009
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,422
    Location:
    Bothell, Washington
  3. Husky Dad

    Husky Dad New Member

    Messages:
    6
    Location:
    Georgia
    No sorry, left the fixture at the job site. The 1/2 inch threaded male piece looks just like any connection ive seen except, if you look close , you see very tiny teeth, or symetricaly placed grit, which i believe are supposed to cut into the copper female threads.
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,422
    Location:
    Bothell, Washington
    Which model is it?
    Are you sure it doesn't use rubber washers at the connection?
  5. Husky Dad

    Husky Dad New Member

    Messages:
    6
    Location:
    Georgia

    Attached Files:

    Last edited by a moderator: Sep 20, 2009
  6. Terry

    Terry Administrator Staff Member

    Messages:
    15,422
    Location:
    Bothell, Washington
    The swivel would have a rubber washer and the tapered thread would use either pipe thread sealant, past or tape.
  7. gardner

    gardner DIY Senior Member

    Messages:
    224
    Location:
    Ontario
    a random guess

    My guess is that you are looking at the results of galling that has occurred during manufacture, due to the reduced machinability of lead-free brass, possibly combined with thread dies designed for normal machinable brass.
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