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Thread: Plug gage?

  1. #1
    Associate Engineer
    Join Date
    Jun 2013
    Posts
    1

    Plug gage?

    Does anyone know what the "flat" or "blunt" lead thread on a plug gage is called? Why is it blunt and not tapered like a normal bolt or screw?

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,314
    Bottoming Tap or Bottom Tap...

    These are used to cut threads close to the bottom of the tap-drilled hole.

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