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Proxxon micromot spare collet set

I am in need for a set of collets with the nut as mentioned in the subject line. Could you tell the sizes(dimensions) of those accessories, as I could not find any information on the official web resource. I am particularly interested to know the thread used on the nut and need you to confirm its size to be 8mmx0.75mm pitch. Is this the case? I also need to know if the stem diameter of collets is somewhat like 4.3mm with the length being about 15mm. Is this also the case? Thanks a lot in advance for answers.

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  • Alex Handy Jul 18, 2013

    The set of collets # 28940 contains 6
    collets with the diameters of 1.0, 1.5, 2.0, 2.4, 3.0 and 3.2 millimeters.


    The thread size on the collet nut is metric
    8 x 0.75 millimeters.


    The base / stem of the collet measures 4.77
    millimeters.


    The length of the collet is 20 millimeters.

  • Alex Handy Jul 26, 2013

    Confirmed very true! Worked awesome with Mastercraft unsupported tool. Fit perfectly on a flex shaft rotary head. Super high quality set of collets!

  • Alex Handy May 18, 2017

    It is kind of pointless to answer a question, which was answered long time ago... If you read my original post... Firstly, the thread size of the collet nut is 8x0.75mm, it is not a standard size, this is fact. Secondly, each collet in the set has the same outer dimensions, consisting of stem and head, Stem is cylindrical part that is inserted into rotary shaft, and head is the part that gets tightened between the nut and the socket. I hope we are clear on this. I do not need any answers on this subject, but if you feel like you need clarifications, I'd be glad to help.

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  • Cars & Trucks Master
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Metric pitch is in 3 types
1 , 1.5 ,1.75 so you will be looking at 1.75 for the pitch so it will be 8mm X 1.75
what do you call the stem diameter
is that the hole in the collets or the shaft diameter that the collets are fitted in under the nut

Posted on May 18, 2017

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