Perma-Coil Thread repair?

Discussion in 'The Garage' started by spagthorpe, Sep 13, 2007.

  1. spagthorpe

    spagthorpe Long timer

    Joined:
    Aug 9, 2002
    Oddometer:
    15,761
    Location:
    San Diego
    My local has everything hardware store has something called Perma-Coil, which I hadn't heard of. Anyone have experience with that kit vs Helicoil or Timeserts?

    It's cheap enough, $25 for a tap, insertion tool, and maybe 12 stainless inserts. What concerns me a little, is the insert is 1.5 times it's width, so a M6 would be 9mm I guess. Not super long. I know with Time-Serts at least, you can get some really long inserts. Since this is a low load application ( 8ft-lbs), maybe it doesn't matter much.

    Just wondering. I think I remember Helicoil kits and Time-Serts being in the $50-$80 range.
    #1
  2. Cumminsman76

    Cumminsman76 befuddled

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    Any more than 1.5 times the diameter is unnecessary.
    #2
  3. eaglemike

    eaglemike Been here awhile

    Joined:
    Jun 16, 2005
    Oddometer:
    904
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    san Diego
    Perma-coil is a heli-coil clone. Only thing I don't like is the installation tools I've seen (at Pep Boys) are real crapeaux. I had to try to use one, a weird size at a difficult angle and was real junk.... I'm spoiled by real helicoil industrail grade stuff and time-serts. Both these are pretty decent. Time-sert is often touted as SO MUCH BETTER. They might be slightly better, might not. I've used lots of both. Since they both use the same size tap, how much better is it really going to be. Both of them have plusses and minuses for the install process. Use what floats your boat.

    all the best,

    Mike

    +1

    What he said above - most all the time 1.5 diamters is plenty
    #3
  4. Scottysix9

    Scottysix9 Shhh...

    Joined:
    Nov 27, 2006
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    Denver
    Perma- and Heli-coils are junk. I have seen several failures and many pullouts. Time Serts ARE better. They are a solid insert, not a coil. More expensive, but well worth the money.
    #4
  5. Southernmost_Paul

    Southernmost_Paul Been here awhile

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    I've found if you put locktite on the coil insert when installing the coil they don't pull out as easy.

    Heli-coils are a pretty good cure for being a little too strong for one's own good. The alterntive is fill the hole with a wield and re-drill/ re-tap or buy a new part.

    Heli-coils work within reason. (no, I don't work for them.)
    #5
  6. eaglemike

    eaglemike Been here awhile

    Joined:
    Jun 16, 2005
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    904
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    san Diego
    I've used thousands of the helicoils and hundreds of time serts. I've seen timeserts pull out too. If the install is screwed up either one can pull out. Think about it - if they both use the same size tap how much difference can there be?? I'll do some torque tests and let you know which one holds the best.

    There's also applications where the timsert can't be used.

    Mike
    #6