Loctite 515 – Flange sealant

Loctite 515 is a medium-strength, anaerobic flange sealant designed for sealing rigid machined metal flanges. It cures in the absence of air when confined between close-fitting metal surfaces, creating a flexible, leak-proof seal that resists vibration, pressure, oils, coolants, and industrial chemicals.
Formulated for use on aluminum, cast iron, and steel flanges, Loctite 515 fills surface imperfections and machining marks to prevent fluid leakage while maintaining excellent sealing performance. Unlike conventional gaskets, it eliminates the need for cutting or stocking multiple gasket sizes and helps reduce maintenance costs.
Loctite 515 remains flexible after curing, allowing it to withstand thermal expansion and contraction without cracking or shrinking. It provides reliable sealing under high operating pressures and temperatures, making it suitable for demanding industrial and automotive applications.
Key Features
Anaerobic flange sealant for rigid metal flanges
Forms a durable, leak-proof seal
Resists oils, coolants, fuels, and many industrial chemicals
Fills gaps and surface imperfections
Eliminates the need for conventional pre-cut gaskets
Excellent vibration and pressure resistance
Remains flexible after curing
Easy to apply and simplifies maintenance
Typical Applications
Gearbox and transmission housings
Engine and pump flanges
Compressor housings
Valve covers and hydraulic equipment
Industrial machinery and process equipment
Metal-to-metal flange assemblies
Benefits
Prevents leaks and improves equipment reliability
Reduces gasket inventory and assembly time
Minimizes maintenance and downtime
Provides long-lasting sealing performance in harsh industrial environments
Loctite 515 is a trusted flange sealing solution for manufacturers and maintenance professionals who require dependable sealing, easy application, and long-term protection for rigid metal flange assemblies.