There’s a few threads on this, but this question gets asked constantly by new and experienced builders. This wiki should be a one stop shop for those questions. Please update as you see fit.
Editor’s request: . As you can see below, there are many grades, each with very specific properties and applications, in many different bottle colors and liquid colors. There’s hundreds more that aren’t listed here. Colors are vague and spread confusion more than help.
|Application||Esk8 Use||Part||Strength||Color||Features||Size||Disassembly||Cure Time||Op Temp|
|THREADLOCKING (screws)||n/a||Loctite 222||Low||Purple||Easily removable with normal tools||Easy||24 hrs||150 C (300 F)|
|Loctite 242||Medium||Blue||Disassembly with normal tools||Normal||24 hrs||180 C (360 F)|
|General purpose medium, truck fasteners & nuts, enclosure fasteners||Loctite 243||Medium||Blue||242 new formulation, with improved oil/dirt resistance||Normal||24 hrs||180 C (360 F)|
|Loctite 262||High||Red||Disassembly with direct heat||Heat, 250C||24 hrs||180 C (360 F)|
|General purpose high, motor mount fasteners||Loctite 263||High||Red||262 new formulation, with improved oil/dirt resistance||Heat, 250C||24 hrs||180 C (360 F)|
|Hanger axles||Loctite 290||Medium/High||Green||Wicking, for preassembled fasteners||Normal||24 hrs||150 C (300 F)|
|RETAINING (shafts)||Loctite 638||High||Green||High viscosity, use on larger gaps approaching 0.25mm||0.25mm gap||Heat, 250C||24 hrs||180 C (360 F)|
|Pulleys/gears/sprockets/keys onto motor shafts||Loctite 648||High||Green||Low viscosity, press/close fit cylindrical parts (100% cure in 7 days)||0.15mm gap||Heat, 250C||24 hrs||175C (350F)|
|Loctite 680||High||Green||Low viscotiy, loose fitting parts, slip fit. Best resistance to dynamic, axial, radial loads. (100% cure in 7 days)||0.2mm gap||Heat, 250C||24 hrs||150 C (300 F)|
Bolded items are recommended to have in your toolbox
Common Application Mistakes
- Failing to clean the fastener and the threaded hole
Dirt, grease, and oil residue are all enemies of threadlockers. To get the full cure and full holding power of your threadlocker, the male and female threads need to be completely clean and dry. Don’t shortcut this step.
- Using too much threadlocker:
Threadlockers only need to be applied to the first few threads on a fastener. Tightening the fastener will spread the threadlocker evenly. Using too much threadlocker can cause excess to spill out and migrate to unwanted areas.
- Not waiting for the proper cure time:
Threadlockers provide excellent holding power - but only after they’ve had time to cure. Typically, threadlockers achieve ‘fixture strength’ in 20 minutes and fully cure in 24 hours. Fixture strength means it’s OK to put your assembly back in service, but a full cure is when you’re getting the full holding power of the threadlocker.
[credit: @rusins ]
To remove pulleys, sprockets, and gears from motor shafts:
Use a pulley remover tool (aka gear puller). They apply way more force than you could by hammering at them.
A wiper arm puller like the Lisle 54150 has thin arms to get into especially tight spacers.
To clean threadlocker off fasteners:
Acetone appears to dissolve blue and red threadlockers quite well. Just use a paper towel and your nails to scrape it off, should work. A wire brush can also be helpful.
To disassemble fasteners with red (high strength) threadlocker:
You need a heat gun. Once you heat it to a certain point and turn the bolt a little bit, it should be possible to then unscrew it completely.
To disassemble fasteners with green (high strength) threadlocker:
You need a butane torch. Even then it might not want to come off. All I can say to you is: good luck
- Amazon - Loctite 243 Surface Insensitive-Medium Strength Tube, Blue, 6-ml ($6)
- Autozone - Loctite 243 Threadlocker Blue Oil Resistant Threadlocker, 6ml ($7.49)
- Autozone - Loctite 263 Threadlocker, 6ml ($7.49)
- Amazon - Loctite 290 Green Wicking Grade Threadlockers, 1.69 oz., 50 mL ($15.90)
- Walmart - Loctite 290 6ml 0.20oz Green Penetrating Threadlocker Tube ($8.39)
- Amazon - Loctite 648 X 50ml High Strength Retaining Compound ($17.49)
- Harbor Freight - PITTSBURGH AUTOMOTIVE 8 in. Three-Jaw Gear Puller ($17)
- Amazon - ABN 4in 3-Jaw Gear Puller – Gear Removal Tool ($14)
Links and prices as of May 2021
Google shopping is your friend, but the above links are a good start. It will take you forever to finish a small bottle, let alone the 50ml bottles.
[credit: @PixelatedPolyeurthan and @frankthedragon]
- Where should I use threadlocker / Loctite on an electric skateboard?
- Loctites: Differences And Their Uses
- LOCTITE 648
- LOCTITE 680 - Retaining compound - Henkel Adhesives
- LOCTITE 638 - Retaining Compound - Henkel Adhesives
- LOCTITE 243 - Threadlocker medium strength - Henkel Adhesives
- LOCTITE 263 - Threadlocker - Henkel Adhesives
- LOCTITE 290 - Threadlocker medium/high strength - Henkel Adhesives