6904ZZ 10 Pack 20x37x9mmThin Section Ball Bearings Metal Shielded,High Speed Chrome Steel Bearing for Electric Motor,Robotics,Hollow Shaft Motors,RC Drones,and More

6904ZZ Deep Groove Ball Bearins-The 6904ZZ bearing has an inner diameter of 20mm, an outer diameter of 37mm, and a thickness of 9mm. It is compact in size and suitable for applications with limited space.-Made of high-quality chromium steel (GCr15), it has good hardness, toughness, and wear resistance, ensuring long-term stable operation of bearings under high-speed and high load conditions.-The Z/ZZ suffix indicates that bearings with metal dust covers can effectively block dust and impurities, maintain lubrication, reduce maintenance, and are suitable for harsh working conditions.-The 6904ZZ ball bearing has excellent high-speed performance and low friction coefficient, which not only reduces energy loss but also improves the energy utilization efficiency of the equipment.-Widely used in various fields such as motors, power tools, office equipment, and home appliances, it provides key support for the efficient and stable operation of various equipment and is a reliable choice in the field of mechanical transmission.

• THIN SECTION LARGE BORE FIT: Model: 6904ZZ (Globally recognized as 6904ZZ , 6904ZZ ). Exact Specifications: 20mm Inner Diameter (Bore) x37mm Outer Diameter (OD) x 9mm Width. Engineered with an ultra-thin wall profile specifically for space-constrained assemblies requiring a large 20mm shaft
• DOUBLE METAL SHIELDED FOR MAX RPM: Equipped with rigid dual metal shields (ZZ) on both sides. This specialized design effectively blocks dust and debris while maintaining exceptionally low friction, unlocking lightning-fast rotational speeds that rubber-sealed bearings cannot achieve
• THE HOLLOW-SHAFT ROBOTICS UPGRADE: The massive 20mm bore combined with a minimal 37mm OD makes it the ultimate choice for hollow-shaft motors, robotic arm joints, and camera gimbals where internal wiring or lasers must pass cleanly through the center of the mechanism
• LIGHTWEIGHT & HIGH EFFICIENCY: Forged from premium Chrome Steel (ABEC-3) and factory pre-lubricated with high-temperature machine grease. It delivers a buttery-smooth rotation and outstanding radial load distribution without adding unnecessary weight to your drones or precision instruments
• VERSATILE DRY-ENVIRONMENT USE: The perfect precision replacement bearing for high-speed, indoor mechanics. Highly recommended for custom 3D printers, optical equipment, indoor cycling trainers, and aerospace modeling.