WikiPedalia is not endorsed or affiliated with the Wikimedia Foundation.
Loctite ®
From WikiPedalia
A liquid adhesive for screw threads. Loctite and similar "threadlockers" are liquid as long as they are exposed to oxygen, but when you put them on screw threads and screw the parts together, oxygen can no longer get to the Loctite, so it hardens up, keeping the threads from loosening up to vibration and the like.
Threadlockers are mainly used for threads that are not intended to be fully tightened: adjustment screws and the like.
There are very few good applications for threadlockers in bicycle work. They include:
- Cantilever brake mounting bolts (front especially.) If these are overtightened, they can "mushroom" the ends of the cantilever bosses, causing the brake to bind up.
- Fixed bottom bracket cups on French or Italian threaded frames French and Italian fixed cups are threaded in the wrong direction, so there is a tendency for them to loosen up in use.
- Mounting rings for some cartridge bottom brackets Many mounting rings are tightened only against the ends of the bearing cartridge rather than having a shoulder or lockring that bears against the end of the bottom-bracket shell.
- Radial spokes.
