Threadlock?

Discussion in 'General Airgun Chat' started by RobF, Aug 25, 2009.

  1. RobF

    RobF Administrator Staff Member

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    I know there's different types... i want something to just stop a small grub screw shaking loose, but as it's only a 3mm diameter thread i don't want something that's going to weld it in so tight i can't easily budge it when I need to...

    the grub isn't under any stress, it's just needed for adjustment now and then.

    any suggestions?
     
  2. Mog

    Mog New Member

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    Always go for the 'Blue' option of whichever brand, the 'Red' or 'Green' option is for permanent fixing.
     
  3. Scooby

    Scooby Pete Dutton

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    The pink/purple 222 is fairly low strength, not that readily available though

    The Medium 248 (blue) may be a bit much for such small fasteners which will usually go at the allen key.
     
  4. Mog

    Mog New Member

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    Have always used the blue for R/C helicopter work, never had a problem, even with very small grub screws etc, but never having used the pink/purple, I'll bow to your superior knowledge. :)
     
  5. Scooby

    Scooby Pete Dutton

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    Not Superior knowledge but I've had a few 3mm grub screw fracture around the allen hole when trying to extract, most of the time in airguns we only need the threadlock to stop the screw moving we don't have to contend with the sort of stresses & vibrations that R/C Heli's are subject to.

    We also have to be extra careful when using Stainless fastenings as the quality often leaves a lot to be desired.
     
  6. Scooby

    Scooby Pete Dutton

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    Loctite now do a number of their products in stick form, a bit like pritstick,

    They do a Copper slip stick, the 268 (red-high) & 248 (blue-med)

    Not sure if they do any others though
     
  7. Scooby

    Scooby Pete Dutton

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    Just remembered they also do a green thread retention stick but I wouldn't advise this as I tried it once & when set needed a blowtorch to move the screw :(
     
  8. villiers

    villiers Self appointed antipimp

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    222 is what you need Rob don,t go any stronger .
     
  9. Weevie

    Weevie Banned

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    If it's for what I think it's for I'd say not to use the blue. The head of that screw rounds rather easily. ;)
     
  10. springboy

    springboy Member

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    I used loctite 542 for the cocking lever screw on my Prosport,it holds really well and i was able to remove easily enough when it came to stripping it for a re-lube.
     
  11. RobF

    RobF Administrator Staff Member

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    It's for the grubs on my sportsmatch adjustable mounts... found them working loose a week ago. No biggie because they are clamped up, so the adjustment will hold barring a big knock, just dont want to lose the buggers.
     
  12. villiers

    villiers Self appointed antipimp

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    If you ever have to remove it loctite 222 is the product you need
    Typical Use:
    Used for applications such as adjustment of set screws, small diameter or long engagement length fasteners where easy disassembly is required without shearing the screw.
    Color/Appearance:
    Purple
    Product Name: LOCTITE ® 222 Threadlocker Low Strength 10 ml 1 Or 2 Part: 1,2
    Mix Ratio: Wipe On Base Chemistry: Acrylic
    Viscosity Cp: 5,000 Cure Time: 10 min / 24 hrs
    Specific Gravity: 1.05 Thermal Conductivity: 0.1 W/(m.K)
    Flash Point: >200 °F

    ;)
     
  13. Conor

    Conor Never been banned from sales Staff Member

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    Alternative to locktite I have used clear nail varnish, or superglue. Use sparingly will prevent vibrations loosening the screw.
    Conor
     
  14. Ratgunner

    Ratgunner New Member

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    Ratgunner

    Try applying a tiny spot of Evo stik contact adhesive to a clean dry thread, screw in and allow to cure overnight, have used this method on all sorts of things and it works particularly well with Airguns,

    Easy to undo and just peel of residue and do her again, works every time :D
     
  15. RobF

    RobF Administrator Staff Member

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    Damn... i hit the net before I saw the replies. Oh well... good suggestions that could have saved me £8.40
     
  16. big_phil555

    big_phil555 New Member

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    I use the blue stuff on teh bolts for the suspension parts to my MTB - it would be too strong for the 3mm grub screw IMO

    go for a 'weaker' mix

    ATB

    Phil
     
  17. FUBAR

    FUBAR New Member

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    Ive used loctite 243 lock 'n seal in the past and its fine (blue):)
     
  18. saltydog

    saltydog I smell something fishy

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    what happen's if you only have pink :p
     
  19. Photosbykev

    Photosbykev New Member

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    For any screws that need to be retained and are not subject to significant vibration Loctite 222 is all you will ever need. Having said that for screws/set screws etc M3 and under I always dab a touch of nail varnish or paint on the edge of the screw after I've fitted it rather than use 222 as even 222 will be sufficiently strong for the heads to be rounded off before it releases.

    35 years designing, building and using manipulators in reactors and I havent lost a screw yet :)
     
  20. Retracted_Yeti

    Retracted_Yeti The Yeti Has Landed!

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    242e.......end of story!;) from a 30+ year old mech engineer!

    Cheers.

    Roy.
     
    Last edited: Nov 29, 2009

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