Graphite Plugged Bronze Bushings: Metallurgy, Solid-Lubricant Transfer, and Heavy-Duty Sliding Performance
A graphite plugged bronze bushing is a cast or continuously cast bronze plain bearing with machined pockets filled by graphite or an engineered solid lubricant. The bronze matrix carries the structural load while graphite transfers a low-friction film to the shaft or guide surface. This design is valuable where grease lines are inaccessible, oil contamination is unacceptable, movement is intermittent, or heavy sliding contact makes routine relubrication unreliable. It is also called a graphite bronze bushing, solid-lubricant bronze bearing, oilless bronze bushing, or self-lubricating bronze sleeve.