Miniature Bearings

What is a Miniature Bearing?

Miniature bearings are small deep groove ball bearings. They range in size from .1181 to 1.000 inch OD (1 to 26mm) and are available in inch and metric sizes, stainless steel or chrome steel. Also available flanged, open, sealed or shielded, depending on your application. 

Miniature bearings perform in everyday applications, as well as the most demanding environments, including high/low temperatures, cryogenic, vacuum, corrosive and high speed. We offer factory-authorized re-lubrication with custom & specialty lubricants, ensuring easy interchange with all major brands, such as NMB. 

Features of Miniature Ball Bearings

• Compact Design: These bearings are ideal for small-scale applications, offering reliable performance in systems where size is a critical factor.
• High Precision: (ABEC-1 to ABEC-9): They are built to strict tolerance levels, making them suitable for high-speed, precise applications like medical devices and robotics.
• Low Friction: Designed to minimize friction, these bearings improve energy efficiency, reduce wear, and help systems run smoothly, even at high speeds.
• Durability: With materials like stainless steel and chrome steel, these bearings perform reliably in harsh conditions.
• Dual Load Handling: They are able to withstand both axial and radial forces, making valuable for systems with combined load demands, such as motors, flow meters, and actuators.

Versions of Miniature Bearings

Miniature and small ball bearings are available in various versions, each suited to specific application needs. Here’s a closer look at the key types:

Standard Type

These bearings handle both axial and radial loads effectively. Their precisely finished arc raceways reduce friction, noise, and vibration, making them ideal for applications like motors, robotics, and precision tools. Available in both inch and metric bore sizes.

Flanged Outer Ring

With a built-in flange on the outer ring, these bearings improve alignment and simplify housing design. Common in compact systems, they make assembly faster and more accurate in applications like small motors and encoders. Also available in inch and metric sizing.

Extended Inner Ring

Featuring a slightly wider inner ring, these bearings eliminate the need for spacers or washers, simplifying installation. They are often used in systems that require easy mounting. 

Flanged Outer Ring & Extended Inner Ring

This hybrid design combines a flanged outer ring for precise alignment with an extended inner ring for better load distribution. It’s perfect for compact systems like robotic arms or flow meters.

Miniature Thrust Bearings

These bearings consist of two washers and a ball set to handle axial loads in one direction. They are ideal for tight spaces in applications like rotary tables, valves, and medical devices requiring precise load support.

Full Complement

Designed without a cage, these bearings hold more balls for a higher load capacity. They work well in space-limited, high-load systems like vacuum pumps and aerospace mechanisms.

Small Sealed & Shielded Bearings

Miniature & small ball bearings typically come with shields or seals and pre-packed lubricant, which simplifies structure and installation. This design eliminates the need for re-lubrication and reduces maintenance costs. There are three types of such bearings:

Metal Shielded Bearings (ZZ1 (Z1), ZZ(Z)): These are protected by a shield plate of pressed steel. The shields can be made of either low carbon steel or stainless steel.

Contact Sealed Bearings (DD(D)): These have superior sealing effectiveness compared to shielded bearings.

Non-Contact Sealed Bearings (VV(V)): Effective sealing is achieved by a labyrinth formed between its bore and the seal groove in the inner ring.

Common Materials of Small Ball Bearings

Different materials give miniature bearings their unique properties, making them suitable for a variety of applications. Here are the most common materials and their benefits:

• Chrome Steel: Popular due to its durability and high load-carrying capacity.
• Stainless Steel: Commonly used for its corrosion resistance and strength, suitable for various applications.
• Ceramic: Known for low friction, high stiffness, and resistance to wear and temperature extremes.

Other Attributes of Miniature & Small Bearings

Miniature and small bearings have additional features that enhance their performance, durability, and adaptability across various applications:

• Cages: Available in different styles, including crown, ribbon, and rivet, these cage types help maintain ball spacing, reduce friction.
• Noise Reduction: These bearings undergo rigorous testing to ensure smooth and quiet operation, making them ideal for noise-sensitive applications.
• Temperature Resistances: Chrome steel bearings can operate continuously at temperatures up to 120°C and handle peaks of 150°C. However, there are specialized bearings with heat-resistant materials, coatings, and lubricants available.
• Internal Clearance: Properly adjusted internal clearances, both radial and axial, help reduce noise, vibration, and heat, improving performance and extending bearing life.

Applications of Miniature & Small Bearings

Miniature and small bearings are essential across many industries, supporting precision and reliability in compact systems. Below are categorized applications based on their use:

Industrial Equipment

• Motors
• Flow meters
• Vacuum pumps
• Automation systems

Medical & Scientific

• Medical instruments
• Laboratory equipment
• Anemometers

Aerospace, Defense & Robotics

• Robotics industry
• Crossbows
• Advanced mechanisms

Food & Beverage

• Food processing machinery
• Beverage handling equipment

Consult our Miniature Bearing Cross Reference Charts to find the most suitable bearing options for your unique applications.

Why Choose LILY Bearing?

Selecting the right supplier is key. At LILY Bearing, we specialize in delivering high-quality solutions, such as mini ball bearings and precision miniature designs. Here’s why we stand out:

• Extensive Expertise: We have decades of experience, manufacturing a wide range of bearings, including thin section and precision ball bearings.
• Customized Solutions: From specialized designs to bushing systems, we provide options that fit your specific application requirements.
• Global Reach: Our products are trusted and available worldwide, providing easy access to the bearings you need, wherever you are.
• Uncompromising Quality: Every bearing is rigorously tested to meet strict standards, giving you confidence in durability and performance.