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Thread: Plug gage?

  1. #1
    schugeorge
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    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
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,611
    Bottoming Tap or Bottom Tap...

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

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