MR Series Metric Miniature Ball Bearings - Precision and Versatility

MR Series

MR series metric miniature ball bearings are high-performance bearings widely used in small machinery and equipment. This series of bearings are made of high-quality steel and have good wear resistance and corrosion resistance, and can operate stably at higher speeds. The gap between the inner and outer rings and balls of the MR series is precisely designed to reduce friction and increase efficiency. These miniature bearings are commonly used in motors, electronic equipment, medical equipment and toys, and are favored for their small size and light weight. MR series bearings are available in a variety of specifications and sizes to meet different application needs. Bearings can also be customized according to customer requirements to suit specific working environments and load conditions. The design of the MR series ensures low noise and low vibration operating characteristics, making it excellent in applications requiring high precision.

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MR Series Metric Miniature Ball Bearings - Precision and Reliability for Compact Designs

Engineered for high-speed rotation and low-friction performance in space-constrained applications, our MR Series metric miniature ball bearings are a critical component for precision engineering.

Manufactured to exacting international standards, these bearings are ideal for applications where compact size and exceptional rotational accuracy are paramount. They are suitable for use in instruments, small motors, and other electromechanical devices requiring high efficiency and durability.

Product Features

High-Precision Manufacturing: The MR series is produced with a focus on dimensional accuracy, ensuring a tight fit and stable performance in precision assemblies. This reduces vibration and noise, crucial for sensitive equipment.
Corrosion Resistance Options: Available in both standard steel and stainless steel variants. The stainless steel miniature bearings are specifically designed for applications in corrosive or high-humidity environments, extending product lifespan and reliability.
Low Torque and Friction: Optimized internal geometry and superior surface finishes minimize running torque, making them highly efficient. This feature is particularly beneficial for low-power instrument applications and battery-operated devices.
Shield and Seal Configurations: Our MR series miniature deep groove ball bearings come with various shield (ZZ) or seal (2RS) options, protecting against contaminants and extending lubrication life. This is vital for miniature bearing dust protection in industrial settings.

Typical Applications

Our high-speed metric miniature ball bearings are utilized across a wide array of industries, including:

Medical and Dental Equipment: Used in precision handpieces, surgical instruments, and diagnostic machinery where small size and sterile operation are critical.
Robotics and Automation: Essential for precision joints and gearboxes in small robots, actuators, and drone gimbal systems.
Instrumentation and Metrology: Deployed in gauges, sensors, and laboratory equipment requiring precise rotational movement with minimal friction.
Computer and Electronics Industry: Integrated into small fans, hard drives, and other micro-electromechanical systems (MEMS).

Frequently Asked Questions

1. How do I choose the correct miniature bearing shield or seal type for my application?

The choice between a shielded (ZZ) and sealed (2RS) bearing depends on your operating environment. Shielded bearings offer protection against larger debris and are suitable for clean, high-speed applications. Sealed bearings provide superior protection against fine dust, moisture, and liquid contaminants, making them ideal for challenging industrial settings. The friction torque of sealed bearings is typically higher. For miniature bearing selection for specific environmental conditions, our technical team can analyze your specific requirements and recommend the optimal solution.

2. What is the expected service life of these miniature bearings under a high-speed, intermittent load?

Bearing service life is a function of multiple factors, including load, speed, lubrication, and environmental conditions. Our MR Series bearings are rated for specific dynamic and static loads, and we provide L10 life calculation data based on ISO standards. For applications with intermittent or complex loading profiles, it is critical to perform a detailed load analysis. Please consult our engineering team with your specific load-speed curve to get an accurate life expectancy for your high-speed miniature bearing application.

Designation				Principal dimensions（mm）					Basic load ratings(N)		Basic load ratings{kgf}		Speed ratings(rpm)			Abutment and fillet dimensions (mm)						Weight(g)
With shiled	Open type	With seal VV	With seal DD	d	D	B	B1	r(min)	Cr	Cor	Cr	Cor	Grease		Oil	da(min)	db(max)	Da(Max)	Db(min)	ra(max)	rb(max)	Open type	With shiled
With shiled	Open type	With seal VV	With seal DD	d	D	B	B1	r(min)	Cr	Cor	Cr	Cor	ZZ	D·D	Z	da(min)	db(max)	Da(Max)	Db(min)	ra(max)	rb(max)	Open type	With shiled
MR31	-	-	-	1	3	15	-	0.05	80	23	8	2.5	130000	-	150000	1.4	-	2.6	-	0.05	-	0.04	-
MR41X	MR41XZZ	-	-	1.2	4	1.8	2.5	0.1	138	35	14	3.5	110000	-	130000	2	1.9	3.2	3.5	0.1	0.1	0.1	0.14
MR52B	MR52BZZ	-	-	2	5	2	25	0.1	187	58	19	6	85000	-	100000	2.8	2.7	4.2	4.4	0.1	0.1	0.16	0.23
MR62	MR62ZZ	-	-	2	6	25	2.5	0.15	330	98	34	10	75000	-	90000	3.2	3	4.8	5.2	0.15	0.15	0.3	0.29
MR72	MR72ZZ	-	-	2	7	25	3	0.15	385	127	39	13	63000	-	75000	3.2	3.8	5.8	6.2	0.15	0.15	0.45	0.49
MR82X	-	-	-	2.5	8	25	-	2	560	179	57	18	60000	-	67000	4.1	-	6.4	-	0.2	-	0.56	-
MR63	MR63ZZ	-	-	3	6	2	2.5	0.1	208	74	21	7.5	71000	-	80000	3.8	3.7	5.2	5.4	0.1	0.1	0.2	0.27
MR83	-	-	-	3	8	2.5	-	0.15	560	179	57	18	60000	-	67000	4.2	-	6.8	-	0.15	-	0.54	-
MR93	MR93ZZ	-	-	3	9	25	4	0.2	570	187	58	19	56000	-	67000	4.6	4.3	7.4	7.9	0.2	0.15	0.73	1.18
MR74	-	-	-	4	7	2	-	0.1	310	115	32	12	60000	-	67000	4.8	-	6.2	-	0.1	-	0.22	-
-	MR74ZZ	-	-	4	7	-	25	-	255	107	26	11	60000	-	71000	-	4.8	-	6.3	-	0.1	-	0.29
MR84	MR84ZZ	-	-	4	8	2	3	0.15	395	139	40	14	56000	-	67000	5.2	5	6.8	7.4	0.15	0.1	0.36	0.56
MR104B	MR104BZZ	-	-	4	10	3	4	0.2	710	270	73	28	50000	-	60000	5.6	5.9	8.4	8.8	0.2	0.15	1.04	1.42
MR85	-	-	-	5	8	2	-	0.1	310	120	31	12	53000	-	63000	5.8	-	7.2	-	0.1	-	0.26	-
-	MR85ZZ	-	-	5	8	-	2.5	-	278	131	28	13	53000	-	63000	-	5.8	-	7.4	-	0.1	-	0.34
MR95	MR95ZZ1	-	-	5	9	2.5	3	0.15	430	168	44	17	50000	-	60000	6.2	6	7.8	8.2	0.15	0.15	0.5	0.58
MR105	MR105ZZ	-	-	5	10	3	4	0.15	430	168	44	17	50000	-	60000	6.2	6	8.8	8.4	0.15	0.15	0.95	1.29
-	MR115ZZ	MR115VV	-	5	11	-	4	-	715	276	73	28	48000	-	56000	-	6.3	-	9.8	-	0.15	-	1.49
MR106	MR106ZZ1	-	-	6	10	2.5	3	0.15	495	218	51	22	45000	-	53000	7.2	7	8.8	9.3	0.15	0.1	0.56	0.68
MR126	MR126ZZ	-	MR126DD	6	12	3	4	0.2	715	292	73	30	43000	40000	50000	7.6	7.2	10.4	10.9	0.2	0.15	1.27	1.74
MR117	MR117ZZ	-	-	7	11	2.5	3	0.15	455	201	47	21	43000	-	50000	8.2	8	9.8	10.5	0.15	0.1	0.62	0.72
MR137	MR137ZZ	-	-	7	13	3	4	0.2	540	276	55	28	40000	-	48000	8.6	9	11.4	11.6	0.2	0.15	1.58	2.02
MR128	MR128ZZ1	-	-	8	12	2.5	3.5	0.15	545	274	56	28	40000	-	48000	9.2	9	10.8	11.3	0.15	0.1	0.71	0.97
MR148	MR148ZZ	MR148VV	MR148DD	8	14	3.5	4	0.2	820	385	83	39	38000	32000	45000	9.6	9.2	12.4	12.8	0.2	0.15	1.86	2.16