ST-3A® Thread Sealant

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This ST-3® family Thread Sealant is a liquid applicant that once applied and allowed to dry, provides a elastic gasket around the threaded component, allowing threads to stay tight during severe vibration. The product not only provides a 2000 psi sealant gasket, but components can be taken apart and re assembled several times with a single application meaning it does not need to be cleaned off and re-applied after every use.

To use simply apply a thin film with a Q tip or similar applicator. Allow to air dry for a minimum of an hour. Thread product together and enjoy. After multiple assembly reassembly of the threaded component you will at some point need to brush the thread clean and reapply the process. This half ounce container contains ~50 applications of product.

Examples of application for Griffin products:

All pistol silencer end caps
Pistol booster housing outside threads only
Revolution booster outside extension threads
Sportsman end caps
Loosly threaded pistol barrel threads.

Do not use on pistol piston retainers or 3 lug rear caps. We recommend Horse Jipe™ 2300° for those applications. 

Additional Details


10 Reviews

  • 5
    ST-3A Thread Sealant

    Published by Josh on 23rd Feb 2023

    This is hands down the best anti-walk remedy for pistol silencers there is. It is the only thing that actually worked for me to prevent walking enough I could get through a whole mag repeatedly. It acts kind of like teflon tape in practice but way better. With teflon tape I would still get the can to walk after only 3-4 shots. With this, I routinely get through my entire magazine with no or minimal walk. Enough I consider the issue resolved - can't recommend highly enough!

  • 5
    It works!

    Published by Carlos on 21st Feb 2023

    Excellent product and easy to use. It works best for modular suppressors that breaks into two as well as end caps. No more baffle strikes! If you are reading this, don’t hesitate get it! Don’t wait like I did. This stuff really works!

  • 4

    Published by Mark on 25th Apr 2022

    Appears to be just what I needed for my barrel/mini comp combo. Haven’t shot it yet but I suspect it’s going to hold up. The little jar has ALOT of applications in it so if I have to reapply a few times a year is no big deal.

  • 5
    Thread sealant

    Published by Sealant on 4th Feb 2022

    Little goes a long way.

  • 5
    Good for hard to clean areas

    Published by R Y on 16th Feb 2021

    Good for areas where you want to eliminate loosening but threadlocker is not appropriate. I've taken to using it on threaded areas where there's a portion of exposed threading subject to carbon and lead deposits. As an example, there are variations in the length of threads on barrels such as found on a 22 pistol, 22/223 rifle, and some silencers like the Silencerco Sparrow. A very light application of this goop in those areas helps keep fouling out of the 1/2x28 threads and away from the o-rings, which are often hard to reach with a pick or brush. Anything you can do to reduce the painstaking and tiresome cleaning required for dirty calibers like 22LR is a good thing.

  • 5

    Published by Mike on 18th Jan 2020

    This stuff is amazing. Put it on your pistol barrel threads and your silencer will NOT back off!

  • 5
    ST-3A Thread Sealant

    Published by Mark B on 6th May 2019

    Have not had time to test it under use; but upon initial application, it appears to do just exactly what it's advertised to accomplish.

  • 5
    Silky smooth threads

    Published by Jim duncan on 4th Mar 2019

    Amazing wonder sauce! Put this on my threads and allowed it to dry for a couple hours... threaded it in and it basically acts as a O ring style elasto polymer gasket. Locks out the carbon and it stays in place for multiple install/disasembly operations. Great product for keeping threaded parts clean, snug, and easily serviceable in the future.

  • 4
    Totally Awesome

    Published by JustinaBusty on 23rd Feb 2019

    It works great

  • 5
    Title of review 126

    Published by antonio romeo on 26th Aug 2018

    works great

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