WWBR Precision Ceramic Ball Si3N4 G5 Silicone Balls 3.969/4.763mm for Bearing/Pump/Linear Slide/Valves Balls/Bike (Number of Pcs : 50pcs, Outer Diameter : 5.556mm)

Advantages of ceramic balls:1. High hardness. Ordinary Gcr15 bearing steel has a Vickers hardness of 800 HV, and zirconia ceramic ball hardness is 1700 HV or more.2, high wear resistance. Ordinary steel ball milling (with a margin of one millimeter) takes about 2-4 hours, while silicon nitride ball processing requires at least 150-200 hours (the process is different and it takes time).4, high temperature resistance. Ceramic balls undergo high temperatures and pressures of several thousand degrees Celsius during the sintering process. The internal molecular structure is very stable and the arrangement is very dense, which makes the coefficient of thermal expansion low, and the temperature change has almost no influence on its structural size. Ceramic balls can work at temperatures up to 1200 degrees Celsius or higher, and low temperatures have little effect on them, so they are widely used in the aerospace industry.5, light weight. Ceramic balls weigh only 50%-60% of ordinary steel balls, and have great promise in the bearing and aerospace fields.6, self-lubricating. The ceramic ball itself has good self-lubricating properties and high processing precision. Can reach G5, G10 grade, ceramic ball wear-resistant and structurally stable, not easy to deform, so it can be finished and applied to many special industries.7, insulation. Ceramics have good insulation.

• Accuracy level: G5
• This paragraph 3.175, 3.969, 4.762, 5.953, 6.35 are suitable for bicycle hub, center shaft, tower base repair parts modification.