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Old Nov 21, 2012, 02:00 AM   #1
tech19181
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Question Screws Coming Out / Which Loctite (Threadlocker)?

Hello:
I have an early 2011 15" Macbook Pro that has been serviced multiple times. The screws are starting to come out of the bottom case. I'm wondering which Loctite (Threadlocker) Apple uses (or should be used) to prevent them from coming out.

Is this one the right one (Blue)? Or should it be the Green one?

http://www.amazon.com/dp/B0002UEMZ2/

Thanks!


The Resolution:

Quote:
Originally Posted by canuckle View Post
I build radio control helicopters as a hobby, and am VERY familiar with Loctite. When used incorrectly I have a $2000 machine plummeting to the ground :-)

You want blue if the screw heads are not damaged and you have a screwdriver that is exactly the right size. If you're concerned about that, use purple.

Whichever you choose, you do NOT want to coat the whole screw. You only need a little for it to do the job, just the last 1/3 of the screw, the other end of the head not the head-end. If you coat the whole screw it will just squeegee out anyway and you will have to clean up the excess.

Your objective is to use just enough to keep it from backing out, not to make it impossible to remove. Feel free to PM me if this is not clear.
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Last edited by tech19181; Nov 21, 2012 at 11:28 PM. Reason: Added the Resolution
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Old Nov 21, 2012, 02:15 AM   #2
ChrisMan287
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I'd go with purple
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Old Nov 21, 2012, 02:27 AM   #3
tech19181
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Question Blue vs. Purple

Quote:
Originally Posted by ChrisMan287 View Post
I'd go with purple
Thank you for your reply. Is there a big difference between blue and purple? Is there a reason why Apple would originally use blue instead of purple? Thanks!
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Old Nov 21, 2012, 03:09 AM   #4
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Quote:
Originally Posted by gbentley111 View Post
Thank you for your reply. Is there a big difference between blue and purple? Is there a reason why Apple would originally use blue instead of purple? Thanks!
YES.. The colours indicate Strength of Holding Torque.. and if it is real LocTite brand, the BLUE may quite possibly Permanently Lock the Small Screws!!

** BLUE :Ideal for all nut and bolt applications 1/4in. to 3/4in. (6mm to 20mm)
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Old Nov 21, 2012, 03:16 AM   #5
tech19181
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Okay I'll get the purple then. And then to apply it you just squeeze a tiny bit on the screw and wipe off the excess? Does it matter if you put it on the top of bottom of the screw?
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Old Nov 21, 2012, 02:53 PM   #6
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It comes out of the tube as a liquid, not a paste, so application won't be terribly difficult. It'll just get all over the screw, pretty much.

I just replaced the thread lock on my 15" the other day, though I used the blue Loctite. Not sure how difficult it will be to remove, but my screws seem to have stopped unscrewing themselves (which is good!).
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Old Nov 21, 2012, 05:20 PM   #7
richnyc
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I use the blue one but in a stick form:

Loctite QuickStix 248 Threadlocker Stick, Medium Strength/Removable; 9GM

FWIW, I use it for my bike stuff and it works quite good on computers, too, it's semi-permanent but I never had trouble to remove them
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Old Nov 21, 2012, 05:43 PM   #8
tech19181
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So the blue one definetly won't be too strong?
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Old Nov 21, 2012, 05:58 PM   #9
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Quote:
Originally Posted by gbentley111 View Post
So the blue one definetly won't be too strong?
Hopefully someone WILL reply who has Used and Removed it.. I cannot say that I have done so with the 'wee little' MBP screws to be honest.. There is such little contact area that perhaps it will not matter..

I DO however know that it is recommended by any and all users I know (more mechanical types) that you need Very Little to make it work, and in fact LESS is better.. Period..

** By Definition, LocTite (or any thread-locking compound) has to dry and seal the threads to do what it does.. I have applied too much on some projects, and weeks later it is still 'wet' and accordingly is not going to hold anything 'tite' as it were.. Although the Heat generated by the computer may also help to set the product..
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Old Nov 21, 2012, 06:20 PM   #10
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This is tough. Some people said blue and some said purple. Now I have no idea which to get. It does seen that the entire screw does not need to be covered in it.
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Old Nov 21, 2012, 06:59 PM   #11
richnyc
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Quote:
Originally Posted by gbentley111 View Post
This is tough. Some people said blue and some said purple. Now I have no idea which to get. It does seen that the entire screw does not need to be covered in it.
To be truthful I have never done it with the little screws like on my cMBP, only bigger ones on desktops and towers. Also, when disassembling PC components you only see blue loctite on screws, even my cMBP has blue loctite on all the main chassis screws, just a touch I believe, you should be fine...

In any case, even purple should be plenty strong to keep not-moving, not-spinning, not-vibrating parts together

Either way, you're gonna be fine... Don't sweat it
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Old Nov 21, 2012, 07:02 PM   #12
canuckle
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I build radio control helicopters as a hobby, and am VERY familiar with Loctite. When used incorrectly I have a $2000 machine plummeting to the ground :-)

You want blue if the screw heads are not damaged and you have a screwdriver that is exactly the right size. If you're concerned about that, use purple.

Whichever you choose, you do NOT want to coat the whole screw. You only need a little for it to do the job, just the last 1/3 of the screw, the other end of the head not the head-end. If you coat the whole screw it will just squeegee out anyway and you will have to clean up the excess.

Your objective is to use just enough to keep it from backing out, not to make it impossible to remove. Feel free to PM me if this is not clear.
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Old Nov 22, 2012, 07:11 AM   #13
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It just so happens that i know somebody who is working for Loctite / Teroson.

canuckle

is 100% correct. If you have a not worn off screw: use the blue Loctite.
Only cover 1/4 to 1/3 of the screw-tip with a very small amount of Loctite.

ONLY the screw shall be covered with loctite! Do not put something into the thread!

Keep in mind that screws are actually made to fit perfectly so there is not much space inside the "system". It should only be a very thin layer.
While youre driving the screw in the Loctite will work it self up.

Try 1/4 first than work your self up to 1/2 covering the screw.

have fun:
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