Permatex Red Threadlocker Permatex's high-strength Red Threadlocker is a potent solution that prevents hardware loosening, eliminating the need for costly Nylock nuts or lock washers. This adhesive-style thread treatment securely locks and seals threaded parts, guarding against vibration-induced loosening and corrosion for lasting durability. The red formula offers maximum strength, ideal for larger nut and bolt applications from 3/8 to 1 (10mm to 25mm). For smaller fasteners or less demanding conditions, consider using Permatex's medium-duty Blue Threadlocker. Features: Highly penetrative, low viscosity liquid thread locker Red, maximum strength permanent formula High strength threadlocker for heavy-duty applications 3/8 to 1 (10mm to 25mm) Especially well-suited for permanently locking studs and press fits Adds 3,000 PSI holding power on slip and press fit assemblies May require heat or special tools for removal