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Thread: Which Loctite for scope ring screws?

  1. #1

    Which Loctite for scope ring screws?


    Was thinking of using loctite on my scope rings when I reassemble it soon - should I use loctite243 or 222 or 221?



  2. #2
    Have to ask but why?

    Have come across loctited screws on a used rifle before and severely cursed the idiot who did so. In fact had to buy new screws as they chewed up so badly. never used locite on them and never had a problem. Expect the same would be true today. Degrease the threads and screw home snugly.... job done.

  3. #3
    Torque screwdriver & check periodically.

  4. #4
    as per McK had a S/H scope that came with rings after having to cut the buggers off due to lock tight red being used I know why it was sold with the rings ? but if you need/have to its the blue type thread lock no stronger but wheeler Torque type driver is all you need ,
    Quote Originally Posted by McKenzie View Post
    Torque screwdriver & check periodically.

  5. #5
    Thanks all - I'll look into torque screw drivers!



  6. #6
    There are very few that operate with low enough settings for a rifle:

    18-20 in-lbs to mount bases

    28-30 in-lbs for rings

    about 45in-lbs for action screws

    The wheeler Fat Wrench is the one to go for

    Wheeler Fat Torque Wrench

  7. #7
    I use 222 on the threads which go into the receiver & the rings. I also put a blob of two part 24hr epoxy between the screws on the receiver (not in the threads) & a couple of small spots where the rings contact the scope tube (again not in threads). It's nothing for me to do 2000km on corrugated roads in a week & not doing this with scope mounts is just daft. I don't use European scopes for the same reason, Leupold seem to be the only ones that can do a million or two kms without problems.
    "Men Who Stare at Deer."

  8. #8
    Just use the correct Loctite, non permanent thread loc. I remember 243/222 being good for scope mounts.
    Loctite done properly gives you a defined torque to open again. How much torque is needed to open a rusted thread???
    Loctite will keep water out, avoids corrosion in the threads and also act as a lubricant opening or closing which can avoid galling of stainless screws in stainless.
    I've been using Loctite for over 30 years now and have in the past used the wrong type which lead to disaster, learning curve. Adhesives/glues are part of engineering and sometimes essential.
    The big problem is that many scope rings have lousy screw quality (optilock for one), that is where the trouble starts.

  9. #9
    SD Regular
    Join Date
    Dec 2008
    East Midlands M1/M69 Junction 21
    Have come across loctited screws on a used rifle before and severely cursed the idiot who did so.
    Me too! If it's a problem the smallest dab of ordinary nail varnish is a better solution. It'll lock it yet be removable with acetone.

  10. #10
    Some screws are hidden and can't be checked without removal such as the screws that secure the Optilock bases to the rings. Loctite 222 studlock or similar is ideal. It also allows you to trust a smaller amount of torque without having to graunch screws up too tight and cause damage to scopes etc. I saw a classic example of this on the range last Saturday where a good shooter was slightly confused when he shot a 5 inch group from a Sako rifle with a S&B PMII scope on a picatinny rail. He then shot another group slightly larger and changed ammo. The first shot of the third group and his scope and rail fell off completely!
    Problem solved! Rifle re-assembled and shot fine.
    I also had a trainee that 'missed' a chest shot deer once. He wasn't sure if he'd hit or not so fired again at the chest. As he fired the second shot, the deer dropped and his scope fell off! He'd missed the first shot completely and somehow hit the roe in the high neck with the second despite aiming at the chest!
    Both of these incidents would have undoubtedly been prevented with a bit of Loctite applied. Low strength studlock gives you confidence and peace of mind with the ability to dis-assemble when applied at sensible torques. I always use it and never have to check my screws as a result. Never had a problem.
    Last edited by Monkey Spanker; 10-02-2016 at 00:41.

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