MR85
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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MR85 Bearing Product Overview & Core Advantages
The MR85 is a single row deep groove ball bearing designed for compact applications requiring reliable performance. This metric bearing features an open design and is constructed from high-grade chrome steel, offering a robust solution for radial loads. Its small cross-section and lightweight design make it ideal for applications where space and weight are critical constraints, while its ABEC1 precision class ensures consistent and dependable operation.
MR85 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| MR85 | Standard model number indicating the bearing size with a 5mm bore and 8mm outside diameter. |
| Open (Seal Type) | No integral seals or shields, allowing for higher speeds and custom lubrication schemes. Requires a clean operating environment or external sealing. |
| MC3 (Radial Internal Clearance) | Specifies a normal radial internal clearance group (0.002mm to 0.013mm), suitable for most general applications. |
| ABEC1 | Defines the tolerance class, ensuring standard precision for runout and dimensional accuracy. |
MR85 Bearing Structural Features & Performance Benefits
Optimized for Radial Loads: The single row deep groove ball bearing construction is primarily designed to support significant radial loads (59 lbf dynamic, 22 lbf static).
High-Speed Capability: The stainless steel cage and open design contribute to a high limiting speed of 53,000 rpm, making it a capable high-speed bearing for miniature applications.
Precision and Stability: Manufactured to ABEC1 tolerances with controlled radial internal clearance, this bearing provides smooth, low-vibration operation.
Durable Construction: Rings and balls made from chrome steel offer high hardness and wear resistance, ensuring a long service life under standard operating conditions.
MR85 Bearing Typical Application Areas
The compact bearing size and performance characteristics of the MR85 make it suitable for a wide range of small, precision devices, including:
- Small Electric Motors and Gear Motors
- Precision Instruments and Optical Encoders
- Office Automation Equipment (e.g., printers, scanners)
- Medical Devices and Dental Handpieces
- Radio-Controlled Models and Drones
