1. #1
    Hi folks,

    I have a length of aluminum tube that is 22.23 mm diameter x 1.6256 mm wall thickness.
    I want to thread the inside of the tube and machine a bolt / cap for the end.
    What size tap and die would you recommend ?
    I was thinking a simple 21mm ? But I thought I would ask in case my logic is wrong..

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  2. #2
    I doubt you will find a 21 mm tap and die
    20 mm 1.0mm pitch would work

  3. #3
    Hmm some 21 mm taps on eBay but from China
    easier to find a 20 mm pair

  4. #4
    Quote Originally Posted by IanParkin View Post
    Hmm some 21 mm taps on eBay but from China
    easier to find a 20 mm pair
    Thanks Ian.. 20mm would give me near enough a 1 mm internal thread.. so would be fine.

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  5. Hi, I have a possible source for a M21 X 1 tap and die, would you like me to take a look tomorrow..? NA Tools America offer us superb deliveries on specials - on average 4-5 days from order receipt.

  6. #6
    If you are anywhere near bristol i would screw cut it for you

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