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Thread: Gas Block Screws

  1. #21
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    Quote Originally Posted by Plasman View Post
    Curious, why "red" loctite 271 over "blue" loctite 242? If you look at the datasheets both break down at 482F/250C. Since both will prevent the screw from backing out under vibration what are the benefits of 271 in this application?
    Fasteners assembled with blue can be removed with common hand tools and no heat. With red you need to heat to 500 to get them apart. Many people have made the mistake using red in the wrong place! GH

  2. #22
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    Quote Originally Posted by GH41 View Post
    Fasteners assembled with blue can be removed with common hand tools and no heat. With red you need to heat to 500 to get them apart. Many people have made the mistake using red in the wrong place! GH
    While that's true that the breaking force for 271 is stronger than 242 below 250C, nothing's putting rotational force on the set screw.

  3. #23
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    Quote Originally Posted by !Nvasi0n View Post
    Never any issues with Red 271. Either with cupped, or pointed set screws. I torque the dog piss out of them with a liberal application of the loc tite.. When finished ill puddle a drop on each screw head and let the upper rest upside down overnight to let it all set up. It won't come lose. I've had barrels smoking, with rails so got you couldn't touch them with anything but a heavy gloved hand...upon inspection the puddle is still solid. Like liquid weld.
    Trying to understand if you are placing locktite on the treads prior to assembling GB and then adding LT to screw heads, or just placing LT on screw heads after assembly and tightening of screws.

    FWIW, have been using 243 lately, as fasteners are removable with hand tools and 243 is supposed to be more tolerant of oils, which are often present around gun parts.

    Mark
    Last edited by mpom; 09-01-13 at 21:24.

  4. #24
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    Yes that's exactly what I meant.

  5. #25
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    Off topic but has anyone shot a gas block with a temp gun after a couple of magazines full auto?? Might take the what loc tite question off of the table. GH

  6. #26
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    I'm planning to put Loctite 2422 (medium strength blue) or 2620 (high strength red) on the next gas block screw I come across. I haven't decided which yet.

    They are both intended for high heat applications. They are both very chemical and water/moisture resistant.

    Although the 2620 is rated "high strength", it's really in between Loctite's standard/common red and blue for holding power at room temp.

    Joe Mamma
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  7. #27
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    Try 290 on Preassembled Screws

    For application to set screws or any threaded fastener AFTER assembly - I have used #290 for years - it is a wicking type threadlocker that very effectively works its way down into the threads. All threaded holes and fasteners must be thoroughly degreased prior to application - this is true with any threadlocking product.
    Also - some of the 600 series Loctite products are exceptional - shaft locking for cylindical assemblies. I've used #620 and it don't budge!
    Last edited by opsoff1; 10-23-13 at 13:47.

  8. #28
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    Quote Originally Posted by Clint View Post
    Hard use barrels get heat and impact.

    That's what they recommend to remove stuck fasteners.

    Loctite is questionable in this application.

    Rocksett is really good.

    Most blocks come with std "cup point" set screws.

    Knurled tip set screws hold really well. This is what we supply with our gas blocks.

    Pinning is best and you never have to worry about it.
    If I can add to this... Loctite is not really a "high temp" solution, I use Cotronics 907TS - good to 2100*F
    Please let me know if I have offended you...
    I would like to move on to my next task.


    I provide legal consultation and training - specializing in the Law of Gravity.

  9. #29
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    Quote Originally Posted by K.L. Davis View Post
    If I can add to this... Loctite is not really a "high temp" solution, I use Cotronics 907TS - good to 2100*F
    I hope you never have to remove it! GH

  10. #30
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    Quote Originally Posted by Plasman View Post
    While that's true that the breaking force for 271 is stronger than 242 below 250C, nothing's putting rotational force on the set screw.
    I agree. So no rotational force means no need for thread locker?? Why bother?? GH

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