MR85ZZ Miniature Ball Bearing High Precision 5x8x2.5mm Shielded Bearing

MR85ZZ Miniature Ball Bearing High Precision 5x8x2.5mm Shielded Bearing

MR85ZZ Miniature Ball Bearing High Precision 5x8x2.5mm Shielded Bearing

• MR85ZZ bearing 5x8x2.5mm is a compact, high-precision miniature deep groove ball bearing designed for smooth, low-friction rotation at very high speeds.
• Featuring double metal shields (ZZ) with a non-contact design, the MR85ZZ miniature ball bearing helps block dust and fine debris while retaining grease for long service life and maintenance-free operation.
• Made from high carbon chrome steel (GCr15) with a steel retainer, the MR85ZZ shielded bearing is ideal for lightweight, space-limited assemblies and supports radial loads with limited axial load capability—perfect for 3D printer parts, micro motors, RC projects, robotics, and precision equipment.

Specifications

• Type: Deep groove ball bearing
• Bore (ID): 5 mm
• Outer Diameter (OD): 8 mm
• Width: 2.5 mm
• Shield Type: ZZ (double metal shields, non-contact)
• Material: High carbon chrome steel (GCr15)
• Cage: Steel retainer
• Lubrication: Grease pre-lubricated
• Dynamic Load Rating: ~365 N
• Static Load Rating: ~132 N
• Max Speed (grease): Up to 60,000 RPM
• Operating Temp: -20°C to +120°C
• Weight: ~0.5–0.7 g

Features

• Miniature Size: Compact 5 × 8 × 2.5mm dimensions make it ideal for small and space-limited mechanisms.
• Deep Groove Design: Provides smooth rotation while primarily supporting radial loads and limited axial loads.
• Double Metal Shields (ZZ): Helps protect the internal components from dust and fine particles while retaining grease.
• Non-Contact Shield Design: Minimizes additional friction, making the bearing suitable for high-speed applications.

Advantages

• High-Speed Performance: Suitable for fast-rotating mechanisms when operated within the bearing’s rated limits.
• Space-Saving Design: Very small dimensions allow installation in compact mechanical assemblies.
• Reduced Friction: Helps improve rotational efficiency and minimize power loss.
• Dust Protection: ZZ metal shields help reduce contamination from dust and fine debris.
• Long Service Life: Durable chrome-steel construction provides good resistance to wear.

Applications

• 3D Printers – extruders, idler pulleys, stepper motors
• RC Cars & Drones – hobby motors, wheel hubs, gearboxes
• Miniature Electric Motors – high RPM motor shafts
• Robotics & Automation – compact actuators, servo mechanisms
• Office Equipment – scanners, cooling fans, printers
• Medical Devices – precision instruments, small pumps
• Model Engineering & DIY Projects – robotics kits, micro gearboxes

Package Includes

• 1 × MR85ZZ Miniature Ball Bearing