... balls and blank balls.With the excellent performances such as Low density, high strength, high hardness, high toughness, corrosion-resistant, abrasion-resistant ... , anti-oxidation, thermal vibration, low-expansibility, self-lubricating, Si3N4 balls are ideal products for bearing ... -0.25≤0.25≤0.5≤0.020G160.2-0.4≤0.4≤0.8≤0.025G200.3-0.5≤0.5 ...