1pcs Ceramic Bearing Balls,30.0mm/30.1625mm/31.75mm/33.3375mm/34.925mm,Si3N4 Silicon Nitride Precision Ball Miniature(30.0mm)

Applications‌: widely used in bearings, industrial machinery, mining equipment, and automotive hubs.Application: Full ceramic bearings, hybrid ceramic bearings, tool measuring tools, valve seals, pumps, ball screw, etc.Features: Lightweight with stable performance and self-lubricating properties.Product performance is stable and consistent.The main advantages of silicon nitride balls:1. It is 59% lighter than steel balls, which greatly reduces the centrifugal force, rolling and wear on the groove when the bearing is running at high speed and acceleration.2. The elastic modulus is 44% larger than that of steel, which means that the deformation amount is much less than that of steel balls when subjected to force.3. The hardness is higher than steel, with HRC reaching 78.4. The friction coefficient is small; there is no adhesive wear.5. The thermal expansion coefficient is 1/4 of steel and can withstand drastic changes in temperature.6. It is easy to obtain higher surface finish, Ra can reach 4~6 nanometers.7. High temperature resistance: Silicon nitride ceramic balls still have high strength and hardness at high temperatures of 1050°C.8. It will never rust and can work without oil lubrication.High-precision grades for metrology.

• Material: Silicon Nitride (Si3N4)
• Accuracy: ±0.0003mm
• HV：1400-1700; HRC：75-80； Service temperature: 1200°C
• Fracture toughness: 5.0-7.0 Mpa.m1/3
• Coefficient of thermal expansion: 3.3°C