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  1. #1
    To much is never enough Badvgood's Avatar
    Join Date
    Jun 2012

    Loctite - Different ones and their properties

    I was searching around and found this so thought I would repost it as it's quite useful.

    271, Red: High strength threadlocker for larger diameter hardware.

    262, Red: High strength threadlocker for for hardware smaller than that which uses 271 (more like heli parts). Either does a good job for our stuff, however. I see 271 most commonly in auto parts stores.

    609, Green: Retaining compound, high strength, for mounting slip fit bearings to shafts.

    603, Green: Retaining compound, high strength, similar to 609 but good where the parts may be a little oily. Good for mounting oilite bushings in housings, BTW.

    640: Green: Retaining compound, high strength. Similar to 609 and 603. Lacks the oil tolerance of 603. I use it where I might have trouble with adjacent bearing contamination with the product, such as start shaft bearing blocks, since it has a little greater viscosity than 603.

    638, Green, rather thick: Ultra strong retaining compound for assemblies with a marked amount of slop in the fit, min 0.004". Don't try to use this stuff for our normal bearings on healthy shafts. It sets almost immediately in the tight gap, and you'll never have the chance to get the bearing into place.

    290, Green: Wicking product for thread locking AFTER assembly. Medium strength, much stronger than 242 blue in my experience. Not the correct choice per loctite for bearing mounting.

    242, 243 Blue: Classic medium strength threadlocker for most of our threadlocking applications. 243 is the oil tolerant version.

    222MS, Purple: Low strength threadlocker for small diameter or otherwise delicate fasteners.

    Bottom line:
    NEVER choose a loctite product by colour alone.

    And this PDF


  2. #2
    idoodou's Avatar
    Join Date
    Mar 2009
    good info should be a sticky

  3. #3
    i wonder if this info is the same for the cheap stuff at the local hardware stores here,it seems like they all carry yellow, blue,and red.

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