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Which thread types can be used together

  1. Aug 22, 2011 #1
    Hi, I am looking to adapt a car intake manifold.
    There are 4 injector holes (untapped) that measure a touch over 18.5mm.
    I plan to tap these holes and fit some reducing nipples to them.
    I have a 7/8" BSW tap bit and some M20x2.5 ISO tap bits.

    I need some help on the following;
    Will the 7/8" bsw be too large for this hole?
    if not, what other threads would work with the 7/8 bsw?

    If I use the M20x2.5 bit instead, what other male threads would work with it?

    The reason I'm asking this is because these are the only bits I have but I am struggling to find nipples or reducers that fit with either the 7/8" bsw or the M20x2.5 bit.

    Thanks

    Dan
     
  2. jcsd
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