608 ZZ 2RS Deep Groove Ball Bearing | 8x22x7mm High Speed Low Noise Miniature Bearing for Skateboard, 3D Printer, Motor

1. Mainstream Materials

 *High-carbon chromium bearing steel GCr15 (AISI 52100): Mainstream and universal, HRC61-65, wear-resistant and long-lasting.

 *Stainless steel 440C/304: Corrosion resistant, suitable for humid/acid/alkali/medical/food environments.

 * Hybrid ceramic: Steel ring + silicon nitride ball, high speed, low noise, non-magnetic, long life.

 *Carbon steel: Low cost, suitable for low-speed, light-load toys/low-end tools.

 2. Manufacturing Process

 Vacuum degassing + precision quenching and low-temperature tempering, fine grinding/ultra-precision machining, surface Ra≤0.02μm, clearance optional CN/C2/C3.

 3. Sealing and Lubrication

 * Open Type (608): No seal, highest speed, requires regular maintenance

 *ZZ: Double-sided metal dust cover, dustproof, close to open-type speed

 *2RS: Double-sided rubber seal ring, maintenance-free for life, dustproof and waterproof

 * Standard Lubrication: Lithium-based grease, -30℃～120℃, lifespan 1000～3000 hours; can be used with high-temperature/food-grade grease

1. Load Capacity

 *Standard GCr15: Rated dynamic load Cr≈3.45kN, rated static load Cor≈1.37kN

 *Primarily designed for radial loads, capable of withstanding certain bidirectional axial loads; pure axial load capacity is 1/3 to 1/2 of the radial load.

 2. Speed Performance

 *Open oil lubrication: Maximum 37000–48000rpm

 *2RS grease lubrication: 16000–32000rpm

 *Ideal operating reference speed: 75000rpm

 3. Accuracy, Clearance, and Noise

 *Accuracy: Standard P0/ABEC 1 meets general requirements; P6/ABEC 3 is used for precision instruments.

 *Clearance: CN for general use at room temperature, C2 for high precision, C3 for high temperature and high speed.

 *Noise: Standard Z1≤38dB; Precision Z2/Z3≤34/32dB, low vibration and low noise.

 *Frictional temperature rise: The coefficient of friction is approximately 0.0015, resulting in low starting torque, low temperature rise, and low energy consumption.

Covering all scenarios of micro-rotating mechanisms, with extremely high versatility:

 1. High-speed rotating machinery: micro motors, cooling fans, drone motors, encoders, model motors

 2. Office and home appliances: printers/scanners, hard drive spindles, blenders, juicers

 3. Sports and leisure: skateboards, scooters, roller skates, fishing reels, fidget spinners

 4. Precision equipment: 3D printers, micro robot joints, precision instruments

1. Economy and Maintenance

  *Mass production, low unit price, extremely high cost-effectiveness, universal interchangeability, convenient procurement

  *2RS/ZZ sealed type: lifetime lubrication, maintenance-free, low operating cost

 *Open type: requires regular cleaning and grease replenishment

 2. Limitations and Selection Recommendations

 *Only suitable for light to medium loads, not resistant to heavy loads and impact loads

 *Installation must ensure coaxiality and alignment, otherwise it is prone to jamming and premature aging

 *Stainless steel is recommended for humid and corrosive environments; ceramic/nylon cages are recommended for high-speed and quiet environments

 *Not suitable for ultra-precision spindles and other extremely high-precision scenarios