Has the choice between threadlockers got you confused? Our handy guide will explain the key differences between red and blue threadlockers and offer application and removal tips. We’ll get you set up with the best Loctite threadlocker for any job!
What’s the difference between red and blue Loctite threadlocker?
Loctite threadlockers are primarily designed to prevent fasteners from leaking or loosening from vibration. The difference between red and blue threadlocker is a matter of strength and removability. Loctite threadlocker blue is designed to easily be replaceable with common tools, whereas red is a more permanent fix. If you have trouble keeping it straight, here’s a helpful rhyme to jog your memory: “Blue, easy to make new. Red, full strength ahead!”
For a hold that can be easily removed, Loctite Threadlocker Blue 242 is the hero. It’s perfect for motorized and nonmotorized parts that need occasional servicing, like car parts (oil pans, water pumps, etc), or even motorized yard equipment, bicycles, furniture and much more.
For parts that need a more permanent hold, like structural bolts in a home, auto suspensions and frames, or any other heavy machinery, Loctite Threadlocker Red 271 is the answer. This industrial grade threadlocker packs a stronger punch than the blue and can only be removed by heating the parts to 500F.
Threadlocker application techniques
The application technique is the same for both red and blue Loctite threadlockers. Here’s what you do.
- Make sure nuts and bolts are clean and free from oil or dirt. Both surfaces must be clean to develop the full bonding strength.
- Apply a few drops of Loctite threadlocker on the bolt, where the nut engagement area will be. No need to apply the threadlocker all the way around the bolt. As you twist on the nut, the product will spread around the bolt forming the seal.
- Twist on the nut to the desired point and allow cure time to be achieved (Full cure in 24 hours).
Removing threadlocker varies depending on the type you’re working with. For Loctite threadlocker blue, simply remove the bolt and nut with normal tools.
Loctite Threadlocker Red 271, is formulated to be a high strength thread locker, meaning it will require the localized heat of a blowtorch to weaken the bond. Here’s how it’s done.
- A blowtorch
- Heat-resistant safety gloves
- Safety glasses
- A wrench
- Wearing safety glasses and heat-resistant gloves, heat the fastener with the blow torch for 2-3 minutes, moving the torch around to heat all sides.
- Turn off the blowtorch and remove the nut with a hand wrench.
Working in a corrosive environment? Even more reason to use a threadlocker. If the nut and bolt are submerged in water, the area covered with threadlocker will prevent corrosion and remain in working condition. This will make removal easier in the long run by preventing rust buildup.