Product structure:

The MR84 2RS is a standard metric miniature deep groove ball bearing. Its basic parameters are: 4mm inner diameter, 8mm outer diameter, and 3mm width. Structurally, it is made of high-quality stainless steel (typically AISI 440C or equivalent) for both rings and balls. The cage is usually made of stainless steel or engineered plastic. The “2RS” suffix indicates that the bearing is equipped with contact-type rubber seals (typically NBR nitrile rubber) on both sides, effectively preventing grease leakage and contaminant ingress. The bearing is pre-lubricated with high-quality grease for lifelong service.

Key performance features:

The main performance features of the MR84 2RS bearing include: excellent dust and moisture protection due to its double rubber seals, enabling stable operation in mildly contaminated environments; low starting and running torque with minimal friction loss for high efficiency; smooth and quiet operation with low noise and vibration levels; made of stainless steel, offering good corrosion resistance suitable for humid or clean environments; compact structure with a high load-carrying capacity relative to its size, ideal for space-constrained designs; pre-lubricated and maintenance-free, easy to install, highly reliable, and with a long service life.

Main application scenarios:

In practical applications, the MR84 2RS bearing is commonly found in the following specific scenarios: supporting the shaft of miniature DC motors (e.g., model car motors, small fan motors); providing shaft support for precision rotary encoders and potentiometers; serving as support bearings for transmission shafts in various small gearboxes and reducers; acting as load-bearing and guiding components for precision rotating parts in medical devices (e.g., rotary joints of minimally invasive surgical instruments); enabling precision movement in office equipment such as paper feed rollers and scanning heads; functioning as shaft sleeves for lightweight conveyor rollers in automation equipment; and serving as low-load rotating components in rust-prone food-grade equipment or laboratory instruments.

Technical Specifications and Requirements:

The technical specifications and requirements for the MR84 2RS bearing typically adhere to international standards for miniature bearings. The precision grade is generally ABEC-1 (or ISO P0), which is suitable for common industrial applications. The radial clearance is typically the standard MC3 group (CN grade). The operating temperature range depends on the seal material and lubricant; with standard NBR rubber seals and general-purpose grease, the applicable range is usually -30°C to +110°C. The limiting speed is slightly lower than that of open bearings due to the presence of seals; specific values should be consulted in the manufacturer's data. During installation, ensure proper tolerance fits between the shaft and housing (typically shaft j5, housing H6), avoid improper impact, and prevent axial preload on the bearing sides to preserve its low-torque characteristics. Operation under conditions that exceed the specified load, speed, or temperature limits is prohibited.

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