Using Loctite Threadlock Glue to secure Quadcopter Motor Screws

by Oscar
Published: Last Updated on

Loctite Threadlock is an important tool for a solid multirotor build. We use Loctite to secure threaded fasteners to avoid loosening from vibration. Here I will share some information about Thread lock and how to use it.

Where to buy?

So What is Loctite Thread Locker?

Loctite thread-lock is often used on motor screws in a quadcopter build. It helps prevent screws from loosening over time due to vibration. When it’s cured the screw or nut will become much harder to remove.

Loctite isn’t like normal glue, It feels more like oil or paint. It can take hours to dry and cure after applying.

How to use Loctite?

You only need to put a tiny drop at the end of the screw, on the thread, before fastening. Don’t use too much or you might have a hard time removing that screw later, and using too little will lack the desired strength.

Loctite glue should be applied at the tip of the screw, this assures full and even coverage over the length of the thread during installation. For best result and full strength, it’s best to remove the bolt or nut and clean all the contact surfaces before applying Loctite glue.

Note that thread locker only works on all metals, such as steel and aluminium, but not on non-metal such as plastic or nylon.

Cheap and Last Forever!

thread-locker-tl242-loctite-screw-glue

I have been using this small bottle of the Thread Locker TL242 for about 4 years now, I am getting great results and there is still about half of a bottle left.

Did I mention the bottle only costed me $1? It’s truly a must-have tool when building a quadcopter!

The ones we use are usually blue liquid, don’t get the red ones because they are for permanent use and extremely difficult to remove!

Removing Loctite screws

To make it easier to remove, you can heat up the screw first.

DON’T use on propeller nuts/shaft

Thread locker has chemicals in it which will affect the plastic of the prop hub and cause it to weaken / crack. So don’t apply thread locker on prop nuts or the shaft threads. If you wish to secure the prop properly, use Nyloc nuts to prevent the props coming loose.

Different Types of Loctite and Applications

Chart – http://www.loctite.com.au/aue/content_data/311083_7129_Application_Wall_Chart_V10.pdf

Edit History

  • Apr 2015 – Article Created
  • Jan 2018 – Updated with purchase link

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9 comments

Hadron 23rd May 2021 - 7:34 pm

If you remove a screw with threadlocker on it, do you have to clean it and reapply the threadlocker or can you just put the screw back on with the old stuff on it?

Reply
Oscar 24th May 2021 - 12:34 pm

The best practice is probably to clean it before applying new coat, but the lazy me usually just leave the old stuff on and apply new coat.

Reply
Sam T 25th May 2020 - 11:19 pm

I learned something useful today: don’t use loctite / thread locker on prop screws! If it touches the polycarbonate it will weaken the plastic. Instead, just check your prop screws regularly to see if they need tightening.

Reply
DroneMonkey 28th January 2018 - 11:34 pm

Title of this article could be misleading to newcomers. Loctite glue and loctite thread locker are two very different things.
Would be better to advise people to go out looking for a low strength thread locker (of any brand!) rather than loctite glue.

Reply
Oscar 29th January 2018 - 1:33 pm

You are right, i have added “thread locker” to the title now.

Reply
Michael Gillen 23rd January 2018 - 5:28 pm

DO NOT use the red Locktite, only the blue. If you use the red you’ll never get the screws out. You can pick it up anywhere, very common in auto repair.

Reply
thibault 18th January 2018 - 11:17 am

never buy the HB one !!!
the one i get did not work.

Reply
Sebastian 10th January 2018 - 6:39 am

How to remove it effectively from the small screws threads?

Reply
Slava Chrome 18th January 2018 - 6:49 pm

You need heat it!

Reply