Anti-Seize Lubricant
A high-temperature protective paste applied to bolts and fasteners to prevent galling, corrosion, and seizing.
Anti-seize lubricant is a heavy-duty protective compound formulated to prevent metal parts from seizing, galling, or rusting together. It typically contains fine metallic particles, such as copper, nickel, or aluminum, suspended in a premium grease base. When applied to threaded connections, it creates a physical barrier that prevents metal-on-metal contact and seals out moisture and road salt.
Anti-seize is particularly critical for fasteners exposed to extreme temperatures or harsh environments, such as spark plug threads in aluminum cylinder heads, exhaust manifold bolts, oxygen sensors, and brake caliper slides. By preventing galvanic corrosion between dissimilar metals (like steel bolts in aluminum blocks), it ensures that components can be disassembled in the future without breaking or stripping the threads.
While anti-seize is highly beneficial, it must be used sparingly and correctly. Because it acts as a lubricant, it reduces the friction required to torque a fastener. If applied to torque-critical bolts (like lug nuts or head bolts) without adjusting the torque specification, it can lead to over-tightening and stretching of the bolt. It should never be used on internal engine parts or near sensitive electrical sensors.