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Thread: Break out torque on rusted nuts.

  1. #1
    Super Moderator LegalAlien's Avatar
    Join Date
    Mar 2009
    Tranquille Valley

    Default Break out torque on rusted nuts.

    For the monkey wrenchers among us.
    I came across this on another Forum:
    Machinist's actually tested penetrates for break out torque on rusted nuts. Significant results!

    They arranged a subjective test of all the popular penetrates with the control being the torque required to remove the nut from a "scientifically rusted" environment.

    *Penetrating oil ..... Average load*
    None ..................... 516 pounds
    WD-40 .................. 238 pounds
    PB Blaster ............. 214 pounds
    Liquid Wrench ..... 127 pounds
    Kano Kroil ............ 106 pounds
    ATF-Acetone mix....53 pounds

    The ATF-Acetone mix was a "home brew" mix of 50 - 50 automatic transmission fluid and acetone. Note the "home brew" was better than any commercial product in this one particular test. Our local machinist group mixed up a batch and we all now use it with equally good results. Note also that "Liquid Wrench" is about as good as "Kroil" for about 20%of the price.
    "Teach me to do it myself" Dr. Maria Montessori (1870-1952)

    BC Riders Member # 20

  2. #2
    Senior Member
    Join Date
    Oct 2010


    Excellent. I have both ingredients in the garage. Will try it on some of the overtorqued fasteners on the 250!!

  3. #3
    Join Date
    Dec 2010
    Port Alberni


    That's interesting about the ATF , remember when I was a young pup starting as an pprentice millwright, an oldtimer telling me about using ATF as a penetrant, and I've never tried it. Gonna mix up a batch and give it a shot.

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