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Can any one tell me what type of thread this is

Discussion in 'Ask the Experts' started by Tom hadlow, Jan 1, 2021.

  1. Tom hadlow

    Tom hadlow OPE Member

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    I am needing to helicoil a Ms150t cranks case mount and the bolt isA IS-D5x26 does any one know what the helicoil would be needed for this
     
  2. mgr1

    mgr1 Super OPE Member

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    Metric m5 x 0,8
     
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  3. Deets066

    Deets066 AKA Deetsey

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    Time sert is way better than helicoil.
    Madsen’s carry’s them, not sure where else.


    FE69D1D0-C4CC-4FAC-91D7-98E51F076E13.png
     
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  4. Tom hadlow

    Tom hadlow OPE Member

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    Hi mate this is a picture of the bolt that I need to helicoli it is the same diameter as an m5 but has a coarser thread
     

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  5. mgr1

    mgr1 Super OPE Member

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    Same diameter as m5, then is it 5x1.
    Thats not metric. Helicoil excist in 5x1
     
  6. Tom hadlow

    Tom hadlow OPE Member

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    Hi mate thank for you help what would I have to look up the find the right helicoil kit
    Thanks Tom
     
  7. mgr1

    mgr1 Super OPE Member

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    First you need 100% what Thread it is.
     
  8. av8or3

    av8or3 So many saw ... so little time... GoldMember

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    That is a thread cutting screw. You won’t find a repair kit for it. The hole would be about right for an M5 helicoil kit. (or thread sert) Replace it with a machine screw.
     
  9. av8or3

    av8or3 So many saw ... so little time... GoldMember

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    I see now the thread is kinda old. He prolly figured it out. :rolleyes:
     
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  10. legdelimber

    legdelimber Super OPE Member

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    That image looks like one of those "tri-lobe" threaded screws.
    They work by displacing the material as you turn them into the hole. The material gets packed into the flat(ish) areas of the threaded diameter and -sort- of hold the screws in then.
    Look from the tip end think of something like the shape of the Wankel engine rotor.
    Look at the threads on the screw and notice the three regions with crud packed into them and then the 3 high spots between them.
    Trouble is the displaced material eventually compacts and then the fasteners become loose and rattle out.
    This material displacement method also leaves a semi-stripped hole even upon the initial installation of the fastener.
    That's why we see so many conversations regarding striped holes, caused by these Tri-Lobe fasteners.

    I'll have to see if I can get a couple of decent photos of the tri-lobes again.
     
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