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Fast one Fast one is offline

CF Senior Member

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  1. Fast one
    09-10-2013 12:43 PM
    Fast one
    A bottoming tap will clean up the threads closer to the bottom of the hole, it's not as tapered at the end as a regular tap. See a picture here, http://en.wikipedia.org/wiki/Tap_and_die. I don't know what size you need but if you measure the outside diameter of the threads that will be the M size. Count 10 threads, measure the length in mm then divide by 10. For example an M10 x 1.25 bolt is 10 mm in diameter (thread OD) with 1.25 threads per mm. If you can't find a bottoming tap at the hardware store McMaster-Carr has them, http://www.mcmaster.com/#standard-taps/=og51q1. See metric high speed hand taps. It sounds like you cross threaded the one hole by installing the bolt crooked, I did the same thing when installling headers and had to retap the hole. Check to make sure that nothing is in that hole by inserting a smaller bolt or wire, marking how far it went in then compare to another hole. If the depth is the same all you need to do is clean up the thread.
  2. tbrent
    09-09-2013 05:57 PM
    tbrent
    Sorry to bother you Fast one... I saw in a thread about a fussy header bolt not going in all the way you mentioned some advice about a bottom tap? I am ignorant to what why and how with self tapping clean up. I just installed headers and all the bolts went in fine except for the second from the back drivers side. It only went in half way then locks up. I took THAT bolt and tried in another location on drivers side header and it went right in.. Seems it's just this tap that has something keeping me out... Do you know what size tap I would need to get to try and clean it out? Hopefully I can drive to a hardware store for one. Thanks for your time...

    Taryn

About Me

  • About Fast one
    City
    Hilton
    State
    NY
    Your Zip Code
    14468
    Occupation
    Engineer
    Year & Model
    1998 convertable
    Color
    red
    Mods
    Quick release fire extinguisher, A4 shifter with computer feedback, hood monitor plus digital fuel pressure, sweep led lamps front and rear, quick release V1 holder, trunk pull down, Pfadt coilovers, heads/ cam/ longtube headers.
    Country of Residence
    US

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  • Last Activity: Yesterday 07:17 PM
  • Member Since: 01-30-2001

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