MR84
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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MR84 Bearing Product Overview & Core Advantages
The MR84 is a metric single row deep groove ball bearing engineered for compact radial load applications. This precision bearing features an open design, standard ABEC1 tolerances, and is constructed from high-grade chrome steel for consistent performance. Its primary advantages include a compact cross-section with a 4 mm bore, making it ideal for applications with strict space constraints, and a high limiting speed of 56,000 rpm, suitable for high-speed operations. The bearing is designed for radial load support and requires lubrication for optimal service life.
MR84 Bearing Model Code Explained, Specifications & Naming Convention
The model number MR84 follows a standard industry nomenclature. Below is a breakdown of its key characteristics:
- MR: Indicates a miniature, metric radial ball bearing series.
- 84: Specifies the dimensional series. The '8' often denotes a very small cross-section, and the '4' indicates a 4 mm bore diameter.
- Implied Specifications: The absence of suffixes indicates an open seal type, a standard MC3 radial internal clearance, and a requirement for external lubrication.
MR84 Bearing Structural Features & Performance Benefits
The MR84's performance is derived from its specific construction and material selection:
- Deep Groove Raceway & Single Row Design: The deep groove geometry enables the bearing to handle radial loads efficiently. The single row design contributes to its compact bearing dimensions (4x8x2 mm).
- High-Grade Materials: Both rings and balls are made from chrome steel, providing high hardness, wear resistance, and a long operational lifespan. The stainless steel cage ensures stability and reduced friction at high speeds.
- Optimized for High Speed: The combination of the precision-ground components and the lightweight stainless steel cage allows the bearing to achieve its high limiting speed.
- Standardized Precision: Manufactured to ABEC1 tolerance class with a controlled MC3 radial internal clearance, ensuring reliable and predictable performance in a wide range of applications.
MR84 Bearing Typical Application Areas
The MR84 miniature ball bearing is suited for a variety of small, high-speed, and precision devices, including:
- Small DC Motors and Stepper Motors
- Precision Instruments and Optical Encoders
- Computer Cooling Fans
- Medical Devices and Dental Handpieces
- Radio-Controlled Models and Drones
- Office Automation Equipment
