608ZZ vs 608-2RS Bearing: What Is the Difference?

608ZZ and 608-2RS are two common deep groove ball bearings with the same standard size: 8mm inner diameter, 22mm outer diameter, and 7mm width. The main difference is the sealing structure.

What Is 608ZZ?

608ZZ bearing has metal shields on both sides. It offers low friction and is suitable for high-speed applications such as motors, fans, skate wheels, and light mechanical equipment.

What Is 608-2RS?

608-2RS bearing has rubber seals on both sides. It provides better protection against dust and moisture, making it suitable for equipment that works in dirtier environments or needs stronger sealing.

Which One Should You Choose?

Choose 608ZZ when speed and low friction are more important. Choose 608-2RS when dust protection and sealing performance are more important. For OEM projects, grease, clearance, noise level, and packing can also be customized.

Conclusion

NKMB Bearings manufactures 608ZZ and 608-2RS deep groove ball bearings for motors, fitness equipment, fans, skate wheels, and OEM applications.