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  1. 20th May 2013, 07:23 PM #1
    bob ward
    bob ward is offline Senior Member
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    Default Taps marked with drill size

    This set of 11/16" x 18 taps (old car tie rods) arrived today. Interestingly, as well as the usual tap info they also say on the tap what size to drill the hole, in this case its 16.1mm, I've never seen that on a tap before. I had to check that they were right of course, theoretically the size is 16.05 so 16.1 is close enough for me.

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  3. 20th May 2013, 09:53 PM #2
    nadroj
    nadroj is offline Mechanical Butcher
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    Default

    I've only seen that on thread insert type taps.
    I have a chart that gives alternative drill sizes, depending on the class of fit wanted.

    Jordan
  4. 21st May 2013, 05:13 PM #3
    C-47
    C-47 is offline Senior Member
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    Default

    Bob,
    I have a set of taps made by Vermont American and as sold by Sears some 30 years ago (when they made 1/2 decent stuff) and they also have a suggested drill size on the shank.

    Sorry my picture taking quality is not in the same league as Anorak Bob's.

    Alan

    tap2.jpg
  5. 21st May 2013, 09:51 PM #4
    steran50
    steran50 is offline SENIOR MEMBER
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    Default

    HI,
    I have a Metric and Imperial Tap & Die set (separate sets - about 15 years old) in My Shed and both Sets have Drill sizes on them. I do have some newer Taps though and they don't have Drill sizes on them.
    Drill sizes for Metric Taps are easy anyway ie 16mm x 1.5 use a 14.5mm drill and 8mm x 1.0 use a 7mm drill.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.
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