Selflubricating inner surface with graphite particles The inner surface is uniformly inlaid with purity graphite particles, creating a naturally selflubricating system that eliminates the need for additional lubricants and reduces friction loss. Friction coefficient during operation: 0.080.12. Durable and longlasting Rust after 48 hours in a salt spray test. Hardness: HB80100. Compressive strength: ≥600 MPa. Service life is 35 times longer than ordinary brass bushings. Precision manufacturing for reliable fit Processed with CNC lathes imported from Germany. Internal bore tolerance: H7 (00.018 mm). External diameter tolerance: IT6 (00.009 mm). Surface roughness: Ra ≤ 0.8 micrometers. Ensures a precise fit with the shaft, with no wobble and no noise. Wide operating range and environmental tolerance Graphitebased lubrication supports stable operation in temperature, dusty, and humid environments. Temperature range: 20 C to 280 C. Materials and construction Material: purity H62 brass. Inner surface uniformly inlaid with purity graphite particles to form the lubricating film as the shaft rotates. Specifications at a glance Material: purity H62 brass with graphite inlay Rust resistance: salt spray test 48 hours Hardness: HB80100 Compressive strength: ≥600 MPa Bore tolerance: H7 (00.018 mm) Outside diameter tolerance: IT6 (00.009 mm) Surface roughness: Ra ≤ 0.8 micrometers Friction coefficient: 0.080.12 Operating temperature: 20 C to 280 C Applications: bearings that require selflubrication and precise fit without external lubrication Use scenarios Scenario 1: Automated production lines and conveyor systems where regular lubrication is difficult or undesirable, reducing maintenance downtime. Scenario 2: Outdoor or dusty/humid machinery such as agricultural equipment, construction machinery, or material handling equipment exposed to challenging environments. Scenario 3: temperature processing equipment, including extrusion or molding machines, where consistent lubrication and long service life are critical.