Key principles.
Different alloys
Mating dissimilar materials. Bronze + stainless OK. Stainless + stainless avoid.
One hard, one soft
Hardness difference reduces galling. Hardened steel + bronze.
Hard chrome, nitriding
Surface hardening reduces galling tendency.
Active or self-lubricating
Lubricate or use self-lubricating material.
Threaded fasteners
Anti-seize on stainless threads. Critical.
Smoother better
Smoother surfaces reduce galling. Polished or ground.
FAQ
Adhesive wear at sliding interface. Microscopic peaks weld together. Common in stainless.
Avoid pairing. Use bronze, plated, or surface-treated mating part.
Apply on threads, sliding interfaces. Stainless particularly benefits. Standard for marine/chemical.
Hard chrome (67-72 HRC). Nitriding (case 60+ HRC). DLC (premium). Bronze plating.
Active oil/grease for sliding. Solid-film (PTFE, MoS2) for assembly. Self-lubricating bushing.
Galling failure expensive. Prevention small premium. Worth investment for critical sliding interfaces.
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