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  1. #1
    wakewhornc's Avatar
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    What Size Tap to use? Exhaust Bolts

    What size drill and tap would I need to use for the exhaust bolts (14mm head)? Some of my threads need to be cleaned up a bit after being resurfaced.


  2. #2
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by wakewhornc View Post
    What size drill and tap would I need to use for the exhaust bolts (14mm head)? Some of my threads need to be cleaned up a bit after being resurfaced.
    M10x1.25 is your thread pitch

    If you are just cleaning up the threads a tap will work, but is designed to actually cut threads. Problems with using a cutting tap is that it can remove too much material and can cause a bolt to strip out when torqued.

    A thread chaser is designed to clean up existing threads

    http://answers.yahoo.com/question/in...5133254AADLSqB

  3. #3
    L Carlson's Avatar
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    Nice post Rich! Great info for some! Lee

  4. #4
    wakewhornc's Avatar
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    Quote Originally Posted by WFO View Post
    M10x1.25 is your thread pitch

    If you are just cleaning up the threads a tap will work, but is designed to actually cut threads. Problems with using a cutting tap is that it can remove too much material and can cause a bolt to strip out when torqued.

    A thread chaser is designed to clean up existing threads

    http://answers.yahoo.com/question/in...5133254AADLSqB
    thanks thats the info i was looking for

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