Loctite 087 threadlocker is a one-component, high strength, medium viscosity, acrylic adhesive. Used to lock and seal large coarse threaded nuts, bolts and studs in a wide variety of applications where high locking strength is required. Loctite letter grade AV (087) high strength threadlocker is used to lock and seal large coarse threaded nuts, bolts and studs in a wide variety of applications, high locking strength is required.