MR85zz
MR Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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MR85zz Bearing Product Overview & Core Advantages
The MR85zz is a miniature deep groove ball bearing designed for compact, high-precision applications requiring reliable performance in confined spaces. As a single row bearing with shielded construction on both sides (denoted by the 'zz' suffix), it offers effective protection against contamination while retaining lubrication. Its primary advantages include a compact design with a 5 mm bore and 8 mm outside diameter, making it ideal for applications where space is at a premium. Manufactured to ABEC1 precision tolerances, it ensures consistent operation and is capable of handling radial loads effectively, with a dynamic load rating of 42 lbf. The combination of chrome steel rings, stainless steel cage, and 300 series stainless steel shields provides excellent durability and corrosion resistance for demanding environments.
MR85zz Bearing Model Code Explained, Specifications & Naming Convention
| Suffix / Prefix | Technical Meaning | Benefit / Implication |
|---|---|---|
| MR85 | Standard bearing designation indicating a metric, miniature size series with a 5mm bore and 8mm outside diameter. | Defines the core bearing dimensions for interchangeability and selection. |
| zz | Indicates the bearing is shielded on both sides. | Provides effective protection against dust and debris, helping to retain lubricant and extend bearing life. It is a non-contact shield, minimizing friction. |
MR85zz Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a width of just 2.5 mm and a weight of only 0.34 grams, this bearing is engineered for applications where minimizing size and mass is critical, such as in small motors and precision instruments.
- Robust Load Capacity: The deep groove raceway and optimized geometry enable it to handle significant radial dynamic loads (42 lbf) and static loads (16 lbf) for its size, providing reliable support in compact assemblies.
- High-Speed Capability: The combination of a stainless steel cage, precision-ground chrome steel balls, and a MC3 radial internal clearance allows for smooth operation at a limiting speed of 53,000 rpm, making it suitable for high-speed spindles and small fans.
- Durable Construction: The use of chrome steel for rings and balls, combined with a stainless steel cage, ensures high strength and resistance to wear. The 300 series stainless steel shields offer excellent corrosion resistance.
- Precision Engineering: Manufactured to ABEC1 tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring consistent performance, reduced vibration, and ease of installation.
MR85zz Bearing Typical Application Areas
The MR85zz miniature shielded bearing is ideally suited for a wide range of compact and high-precision mechanisms, including:
- Small Electric Motors: Used in DC motors, stepper motors, and servo motors for drones, RC models, and office automation equipment.
- Precision Instruments & Medical Devices: Ideal for optical encoders, gauges, dental handpieces, and small laboratory equipment where reliability and compactness are paramount.
- Computer Peripherals: Commonly found in the spindle motors of hard disk drives (HDDs), cooling fans, and small printers.
- Robotics & Automation: Used in joints, gears, and small actuators of collaborative robots and automated guided vehicles (AGVs).
- Consumer Electronics: Applicable in miniature fans, gyroscopes, and various moving parts within cameras, smartphones, and wearables.
