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Professional precision ball bearing manufacturer Professional precision ball bearing manufacturer

Miniature Precision Ball Bearings

LUMI manufactures high-precision miniature ball bearings designed for compact, high-speed, and space-limited applications. With low friction, low noise, and excellent rotational accuracy, our miniature bearings are widely used in micro motors, drones, robotics, medical devices, dental equipment, and precision instruments.

Available in various sizes, materials, and customized designs, LUMI provides reliable miniature bearing solutions for demanding applications.

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Miniature Precision Ball Bearings

Miniature Ball Bearings: Performance & Advantages

Optimized internal geometry and lightweight design deliver stable, high-speed rotation in compact systems.

High-Speed Performance

Precision raceway finishing and carefully controlled internal clearance minimize friction and vibration for smooth, quiet operation.

Low Friction & Low Noise

High-quality materials combined with strict manufacturing control help reduce wear and ensure long-term, reliable performance.

Long Service Life

Designed to handle light to moderate radial loads, miniature ball bearings maintain stability within compact structural designs.

Stable Radial Load Support

Available in sealed or shielded configurations with pre-lubrication, reducing maintenance needs in enclosed or hard-to-access systems.

Maintenance-Free Options

Miniature Ball Bearings: Structure

Inner Ring: Its dimensional accuracy and surface finish directly influence rotational accuracy and running stability.

Outer Ring: It helps maintain bearing alignment and supports radial loads while ensuring structural stability within compact assemblies.
Balls: Precision-grade steel or stainless steel balls reduce friction by enabling rolling motion between the raceways. Controlled ball diameter and surface quality contribute to smooth rotation, low noise, and consistent performance.
Cage: This ensures stable motion, reduced friction, and reliable operation at high rotational speeds.
Seals / Shields: Seals or shields protect internal components from dust, moisture, and contaminants.

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Miniature Ball Bearings: Design & Mounting Configurations

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Flanged Design:

Flanged miniature ball bearings feature an integrated flange on the outer ring, providing accurate axial positioning and preventing axial movement during installation and operation. This design simplifies housing construction and reduces the need for additional positioning components, making it ideal for space-limited and precision-aligned applications.

Key Benefits:

• Accurate axial location within the housing
• Simplified installation and improved assembly efficiency
• Enhanced stability in compact structures
• Available in chrome steel and stainless steel materials

Non-Flanged Design:

Non-flanged miniature ball bearings use a standard cylindrical outer ring design, offering greater flexibility for applications where axial positioning is achieved through external components. This configuration is suitable for a wide range of housings and provides reliable performance in standard mounting arrangements.

Key Benefits:

• Flexible mounting with external axial positioning
• Compatible with a wide range of housing designs
• Suitable for standard assembly and alignment methods
• Available in chrome steel and stainless steel materials

Flanged Design:

Flanged miniature ball bearings feature an integrated flange on the outer ring, providing accurate axial positioning and preventing axial movement during installation and operation. This design simplifies housing construction and reduces the need for additional positioning components, making it ideal for space-limited and precision-aligned applications.

Key Benefits:

• Accurate axial location within the housing
• Simplified installation and improved assembly efficiency
• Enhanced stability in compact structures
• Available in chrome steel and stainless steel materials

Non-Flanged Design:

Non-flanged miniature ball bearings use a standard cylindrical outer ring design, offering greater flexibility for applications where axial positioning is achieved through external components. This configuration is suitable for a wide range of housings and provides reliable performance in standard mounting arrangements.

Key Benefits:

• Flexible mounting with external axial positioning
• Compatible with a wide range of housing designs
• Suitable for standard assembly and alignment methods
• Available in chrome steel and stainless steel materials

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Miniature Ball Bearings: Sealing Types & Configurations

Open Type

Open type miniature ball bearings feature an unsealed design with direct access to the raceways and rolling elements. They offer low friction and excellent high-speed performance for clean environments or applications with external lubrication.

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Shielded Type (ZZ)

Shielded miniature ball bearings use metal shields to provide basic protection against dust and small particles while maintaining low friction. This configuration offers a balanced solution between protection and rotational speed.

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Sealed Type (2RS)

Sealed miniature ball bearings are equipped with rubber or polymer seals to prevent the ingress of dust, moisture, and contaminants. Pre-lubricated and maintenance-free by design, they are ideal for enclosed or demanding operating environments.

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Open Type

Open type miniature ball bearings feature an unsealed design with direct access to the raceways and rolling elements. They offer low friction and excellent high-speed performance for clean environments or applications with external lubrication.

Request a quote

Shielded Type (ZZ)

Shielded miniature ball bearings use metal shields to provide basic protection against dust and small particles while maintaining low friction. This configuration offers a balanced solution between protection and rotational speed.

Request a quote

Sealed Type (2RS)

Sealed miniature ball bearings are equipped with rubber or polymer seals to prevent the ingress of dust, moisture, and contaminants. Pre-lubricated and maintenance-free by design, they are ideal for enclosed or demanding operating environments.

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Miniature Ball Bearings: Material Options

Chrome Steel (GCr15 / AISI 52100)

Chrome steel miniature ball bearings offer high hardness, excellent fatigue resistance, and stable running performance. They are suitable for high-speed and low-noise applications operating in clean or controlled environments.

AISI 440C/ 420 / 304 / 316

Stainless steel miniature ball bearings provide corrosion resistance for applications exposed to moisture, chemicals, or frequent cleaning. Different stainless grades are available to balance corrosion protection and mechanical performance.

Chrome Steel (GCr15 / AISI 52100)

Chrome steel miniature ball bearings offer high hardness, excellent fatigue resistance, and stable running performance. They are suitable for high-speed and low-noise applications operating in clean or controlled environments.

AISI 440C/ 420 / 304 / 316

Stainless steel miniature ball bearings provide corrosion resistance for applications exposed to moisture, chemicals, or frequent cleaning. Different stainless grades are available to balance corrosion protection and mechanical performance.

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Miniature Ball Bearings: Application

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Automotive

Drone/UVA

Fitness Equipment

Robotics

Gearboxes

Food Machinery

Agricultural Machinery

Home Appliances

Miniature Ball Bearings: Customization & OEM/ODM

• Material Selection: Miniature ball bearings are available in stainless steel and bearing steel materials, selected based on corrosion resistance, load requirements, and operating environment.
• Precision & Internal Clearance Control: Internal clearance options (C0 / C2 / C3 / C4) and precision grades (ABEC-1 / 3 / 5 / 7 or ISO equivalents) can be customized to meet specific requirements for speed stability, noise level, and rotational accuracy in miniature applications.
• Sealing & Structural Configurations: Open type, ZZ metal shields, 2RS rubber seals, and flanged designs are available to support compact installation, contamination protection, and assembly stability in micro devices.
• Lubrication & Noise Optimization: Customized lubrication solutions—including low-noise grease, high-speed grease, oil lubrication, and special-purpose lubricants—are available to reduce starting torque, vibration, and running noise in miniature bearing applications.

• Performance Optimization for Miniature Applications: Lumi supports performance-oriented customization for miniature ball bearings, focusing on low starting torque, stable high-speed rotation, reduced vibration, and extended service life under compact operating conditions.
• Prototype & Sample Development Support: We provide technical support for prototype development and sample validation, helping customers evaluate fit, performance, and reliability before mass production in miniature bearing applications.
• OEM and ODM Support: From custom branding and packaging to technical drawing confirmation and long-term supply coordination, Lumi offers comprehensive OEM and ODM services to ensure consistent quality, reliable performance, and stable mass production.

• Material Selection: Miniature ball bearings are available in stainless steel and bearing steel materials, selected based on corrosion resistance, load requirements, and operating environment.
• Precision & Internal Clearance Control: Internal clearance options (C0 / C2 / C3 / C4) and precision grades (ABEC-1 / 3 / 5 / 7 or ISO equivalents) can be customized to meet specific requirements for speed stability, noise level, and rotational accuracy in miniature applications.
• Sealing & Structural Configurations: Open type, ZZ metal shields, 2RS rubber seals, and flanged designs are available to support compact installation, contamination protection, and assembly stability in micro devices.
• Lubrication & Noise Optimization: Customized lubrication solutions—including low-noise grease, high-speed grease, oil lubrication, and special-purpose lubricants—are available to reduce starting torque, vibration, and running noise in miniature bearing applications.

• Performance Optimization for Miniature Applications: Lumi supports performance-oriented customization for miniature ball bearings, focusing on low starting torque, stable high-speed rotation, reduced vibration, and extended service life under compact operating conditions.
• Prototype & Sample Development Support: We provide technical support for prototype development and sample validation, helping customers evaluate fit, performance, and reliability before mass production in miniature bearing applications.
• OEM and ODM Support: From custom branding and packaging to technical drawing confirmation and long-term supply coordination, Lumi offers comprehensive OEM and ODM services to ensure consistent quality, reliable performance, and stable mass production.

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