How to Use Threadlock (Loctite) to Secure FPV Drone Motor Screws

by Oscar

Threadlocker, also known as Loctite, is an essential tool for a reliable FPV drone build. It’s used to secure metal threaded fasteners to prevent them from loosening due to vibrations. In this guide, I will share insights about Threadlock and how to utilize it effectively.

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Where to Buy?

You can purchase your threadlock from these vendors:

I’ve been using this TL242 bottle for years. The liquid is blue, which is the one you want. Steer clear of the red liquid type as it’s meant for permanent use, making it incredibly tough to remove.


What’s ThreadLocker and Benfits

Loctite threadlock is frequently used for motor screws in FPV drone builds. It helps prevent screws from unintentionally loosening due to vibrations. Unlike standard glue, Loctite feels similar to oil or paint. It often requires hours to thoroughly dry and cure after application.

In certain scenarios, such as when using a nyloc nut, it’s best to refrain from using threadlocker. The reason? The nylon insert in the nyloc nut will securely lock the bolt and nut in position, rendering threadlock redundant.

How to Use Threadlock?

Many motors and frames come with bolts that already have threadlock – indicated by the blue paint on the thread. If not, simply grab a bottle and apply it yourself. A small bottle can literally last for years; I bought mine in 2013 and still have some left.

How To Build Fpv Drone 2023 Install Motors Screws Threadlock

  1. Pour a small amount of threadlocker into a tray – a dab is all you need.
  2. Wipe the screws’ threads using a paper towel. While have a little grease isn’t a problem, it’s always good to clean off any residue or dust before applying.
  3. Dip only the screw’s tip into the threadlocker. Avoid over-application as it might make the screw challenging to remove later. However, using too little may not provide the desired strength. If over-applied, simply wipe off the excess.
  4. Install the screw. The threadlocker will secure everything in place. Allow it to settle for several hours, ideally a day.

Removing Threadlocked Screws

Applying too much threadlocker can sometimes result in screws being too tight to undo. If the screw won’t turn at all, apply heat to that screw. A hot soldering iron placed on the fastener and held for several seconds might help. Repeat as necessary.

Avoid Threadlocker on Plastic

Note that threadlock only works on metals, such as steel, titanium and aluminium, but not on plastic, nylon and wood.  Avoid using threadlockers on plastic threads. Even though there’s no harm using it on most modern nylons and quadcopter parts, some plastics can react adversely, so avoid if possible.

Never apply threadlock to the motor shaft as it can compromise the plastic of the propeller hub, potentially causing it to weaken or even crack. A nyloc nut should suffice to prevent propellers from coming loose.

Edit History

  • Apr 2015 – Article Created
  • Jan 2018 – Updated with purchase link
  • Jul 2023 – Refreshed information and updated product links

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bopiloot 29th September 2023 - 2:53 pm

DO NOT use on PolyCarbonate screws. One would think to reduce rotating mass on a toothpick craft for example and use PC M2 screws. A real good idea untill you use threadlock on them. I used loctite blue and it caused the screws to disintegrate. Grtz

KipperFPV 12th August 2023 - 5:42 pm

I used some blue medium strength V-Tech loctite that I had I bought for some automotive work on my Cinelog35 V2 and all my screw heads ended up being stripped. Not sure if it was too strong for purpose or whether the screws that came with the Geprc Cinelog35 V2 are made from cheese. Had to Dremel a slot into the heads and have now replaced them with some 12.9 and 10.9 grade steel screws. Reluctant now to use any threadlocker now.

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?

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.

Robert 10th September 2023 - 8:20 am

Could you please add a picture of a removed screw? Those pre-applied screws from fpv manufacturers look still good, but my self added ones look brittle and sandy in a way??

Oscar 10th September 2023 - 1:35 pm

I’d say that’s normal, just clean the thread of the bolts with a dry cloth and reapply thread lock the next time.

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.

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.

Oscar 29th January 2018 - 1:33 pm

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

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.

thibault 18th January 2018 - 11:17 am

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

Sebastian 10th January 2018 - 6:39 am

How to remove it effectively from the small screws threads?

Slava Chrome 18th January 2018 - 6:49 pm

You need heat it!