Loctite 243 Blue Threadlocker is a general-purpose, medium strength threadlocker with improved oil tolerance. For fasteners between 1/4" and 3/4" (6mm to 20mm). Parts can be separated using hand tools. Suggested applications: Rocker studs, rocker adjustment bolts and bolts on valve and cam covers, oil pans, disc brake calipers, intakes and alternators, and pulley assemblies.