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  1. #1
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    930

    Default Mill Clamp Stud Threads

    Got a job lot of clamp sets at auction, and found a mixture of 1/2" W, 1/.2" UNC and M12.

    Started using the W set and found then easy to use, as compared to the M8 I had used for years on my small mill.
    Then tried the UNC and M12.

    Discovered the various threads had a different "feel" about them in regards tightening and removing the nuts and T-nuts.
    The M12 being the worst, with UNC in-between.
    Worst as in sticking.

    In my opinion, the W thread form really stands out as superior in this application.
    What do others think ?

    But, I am keeping the M12 as I run a metric shop - no precision measurement in fractions here !
    My practice is to inspect the studs before use, and wire-brush them to clean.

    I have posted in the Sale section for disposal of the W and UNC clamp sets.
    Keep well,
    John.

  2. #2
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    Can't say I've noticed the M12 sets at work being sticky

  3. #3
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    I've a few 5/8" studs that came from a clamp set that I picked up. I found that the thread seemed to get harder to screw the nuts onto as they moved along, then freed up at the ends. I've put this down to the studs getting stretched in use. I've had this effect with stud/threaded bar as well.
    Best Regards:
    Baron J.

  4. #4
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    930

    Default

    My experience with M8 studs was that the stud threads built up adhering dust, dirt, and chips causing the nut fit to be temperamental.
    Always cured by brushing with a wire brush.

    The M12 and UNC seem to suffer the same problem, albeit to a lesser extent because of their size compared to M8.
    In comparison, the W form seemed much more tolerant to the rubbish.

    I put this down to the smaller flank angle and the rounded tips of the W form.

    A very good mechanical design engineer told me years ago that the theory of thread fixings predicts less holding power of the W form compared to a similar size of metric/UNC form.
    The difference can be important for permanent fixings, but could be an advantage for job clamping.

    Keep well,
    John.

  5. #5
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    If you find you need more M12 studs, a cheap way to buy decent pre cut studs is to buy Ramset or Hilti studs for the glue in epoxy system they sell for the building and construction industry.

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