Miniature Ball Bearings
Precision miniature ball bearings for compact industrial and OEM applications
Miniature Ball Bearings
BTON manufactures high-precision miniature ball bearings engineered for compact, high-speed, and space-constrained applications where stable performance and dimensional accuracy are required.
Our miniature bearings are produced in stainless steel and chrome steel materials and are available in both flanged and non-flanged designs. They deliver smooth operation, low noise, and reliable performance across a wide range of operating conditions.
With advanced manufacturing control and precision raceway design, BTON miniature ball bearings provide excellent rotational accuracy, long service life, and consistent batch-to-batch uniformity, ensuring dependable performance in both prototype and mass-production applications.
BTON also offers OEM / ODM customization services, including material selection, structural design, internal clearance control, and lubrication solutions, to meet specific application requirements.
Superior Manufacturing, Reliable Bearing Quality
Miniature Ball Bearings: Performance & Advantages
Miniature ball bearings are engineered for stable, reliable performance in compact, high-speed, and precision-driven applications. Optimized internal geometry and controlled manufacturing enable smooth operation and
long-term reliability in space-limited environments.
High-Speed Performance
Optimized internal geometry and lightweight design deliver stable, high-speed rotation in compact systems.
Low Friction & Low Noise
Precision raceway finishing and carefully controlled internal clearance minimize friction and vibration for smooth, quiet operation.
Long ServiceLife
High-quality materials combined with strict manufacturing control help reduce wear and ensure long-term, reliable performance.
Stable Radial Load Support
Designed to handle light to moderate radial loads, miniature ball bearings maintain stability within compact structural designs.
Maintenance-Free Options
Available in sealed or shielded configurations with pre-lubrication, reducing maintenance needs in enclosed or hard-to-access systems.
Miniature Ball Bearings: Structure
Miniature ball bearings feature a compact, precision-engineered structure designed to ensure smooth rotation, dimensional stability, and reliable performance in space-limited applications. Each component contributes to reduced friction, stable alignment,
and consistent operation under high-speed and light-load conditions.
Key Structural Elements:
Inner Ring: The inner ring is mounted on the shaft and provides a precision-ground raceway for the rolling elements. Its dimensional accuracy and surface finish directly influence rotational accuracy and running stability.
Outer Ring: The outer ring is typically fitted into the housing and contains the corresponding raceway. 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: The cage separates and guides the balls evenly around the bearing, preventing contact between rolling elements. 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. Depending on application requirements, open, shielded, or sealed configurations are available to balance protection and rotational efficiency.
Miniature Ball Bearings: Design & Mounting Configurations
Miniature ball bearings are available in different structural and mounting configurations to meet specific installation and axial positioning requirements in compact assemblies. By selecting the appropriate design, engineers can improve assembly efficiency,
alignment accuracy, and overall system stability.
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
Miniature Ball Bearings: Sealing Types & Configurations
Miniature ball bearings are available in multiple sealing types and configuration options to meet different operating environments and application requirements. By selecting the appropriate sealing structure and lubrication condition, bearings can achieve
an optimal balance between protection, rotational efficiency, and service life.
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.
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.
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.
Miniature Ball Bearings: Material Options
Miniature ball bearings are manufactured using carefully selected materials to meet the demands of precision, high-speed operation, and long-term reliability in compact applications. Material selection focuses on smooth rotation, dimensional stability,
and suitability for specific operating environments.
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.
Miniature Ball Bearings: Technical Data & Specifications
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| 603 | / | Open | 3 | 9 | 0.15 | 3 | 0.92 | 59,000 | 635 | 219 |
| 603 | ZZ | Metal Shields | 3 | 9 | 0.15 | 5 | 0.92 | 50,000 | 635 | 219 |
| 604 | / | Open | 4 | 12 | 0.2 | 4 | 2.1 | 51,000 | 970 | 360 |
| 604 | ZZ | Metal Shields | 4 | 12 | 0.2 | 4 | 2.1 | 43,000 | 970 | 360 |
| 605 | / | Open | 5 | 14 | 0.2 | 5 | 3.5 | 46,000 | 1330 | 505 |
| 605 | ZZ | Metal Shields | 5 | 14 | 0.2 | 5 | 3.5 | 39,000 | 1330 | 505 |
| 606 | / | Open | 6 | 17 | 0.3 | 6 | 6 | 42,000 | 2190 | 865 |
| 606 | 2RS | Rubber Seals | 6 | 17 | 0.3 | 6 | 6 | 35,000 | 2190 | 865 |
| 606 | ZZ | Metal Shields | 6 | 17 | 0.3 | 6 | 6 | 35,000 | 2190 | 865 |
| 607 | / | Open | 7 | 19 | 0.3 | 6 | 8.0 | 40,000 | 2240 | 910 |
| 607 | 2RS | Rubber Seals | 7 | 19 | 0.3 | 6 | 8.0 | 34,000 | 2240 | 910 |
| 607 | ZZ | Metal Shields | 7 | 19 | 0.3 | 6 | 8.0 | 34,000 | 2240 | 910 |
| 608 | / | Open | 8 | 22 | 0.3 | 7 | 12 | 37,000 | 3350 | 1400 |
| 608 | 2RS | Rubber Seals | 8 | 22 | 0.3 | 7 | 12 | 32,000 | 3350 | 1400 |
| 608 | ZZ | Metal Shields | 8 | 22 | 0.3 | 7 | 12 | 32,000 | 3350 | 1400 |
| 609 | / | Open | 9 | 24 | 0.3 | 7 | 14 | 36,000 | 3400 | 1450 |
| 609 | 2RS | Rubber Seals | 9 | 24 | 0.3 | 7 | 14 | 31,000 | 3400 | 1450 |
| 609 | ZZ | Metal Shields | 9 | 24 | 0.3 | 7 | 14 | 31,000 | 3400 | 1450 |
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| 623 | / | Open | 3 | 10 | 0.15 | 4 | 1.6 | 58,000 | 640 | 224 |
| 623 | ZZ | Metal Shields | 3 | 10 | 0.15 | 4 | 1.6 | 50,000 | 640 | 224 |
| 624 | / | Open | 4 | 13 | 0.2 | 5 | 3.2 | 49,000 | 1310 | 490 |
| 624 | ZZ | Metal Shields | 4 | 13 | 0.2 | 5 | 3.2 | 42,000 | 1310 | 490 |
| 625 | / | Open | 5 | 16 | 0.3 | 5 | 4.8 | 44,000 | 1760 | 680 |
| 625 | ZZ | Metal Shields | 5 | 16 | 0.3 | 5 | 4.8 | 37,000 | 1760 | 680 |
| 626 | / | Open | 6 | 19 | 0.3 | 6 | 8.1 | 40,000 | 2340 | 885 |
| 626 | 2RS | Rubber Seals | 6 | 19 | 0.3 | 6 | 8.1 | 34,000 | 2340 | 885 |
| 626 | ZZ | Metal Shields | 6 | 19 | 0.3 | 6 | 8.1 | 34,000 | 2340 | 885 |
| 627 | / | Open | 7 | 22 | 0.3 | 7 | 13 | 37,000 | 3350 | 1400 |
| 627 | 2RS | Rubber Seals | 7 | 22 | 0.3 | 7 | 13 | 32,000 | 3350 | 1400 |
| 627 | ZZ | Metal Shields | 7 | 22 | 0.3 | 7 | 13 | 32,000 | 3350 | 1400 |
| 628 | / | Open | 8 | 24 | 0.3 | 8 | 17 | 36,000 | 4000 | 1590 |
| 628 | 2RS | Rubber Seals | 8 | 24 | 0.3 | 8 | 17 | 31,000 | 4000 | 1590 |
| 628 | ZZ | Metal Shields | 8 | 24 | 0.3 | 8 | 17 | 31,000 | 4000 | 1590 |
| 629 | / | Open | 9 | 26 | 0.3 | 8 | 20 | 35,000 | 4550 | 1960 |
| 629 | 2RS | Rubber Seals | 9 | 26 | 0.3 | 8 | 20 | 30,000 | 4550 | 1960 |
| 629 | ZZ | Metal Shields | 9 | 26 | 0.3 | 8 | 20 | 30,000 | 4550 | 1960 |
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| 634 | / | Open | 4 | 16 | 0.3 | 5 | 5.1 | 44,000 | 1760 | 680 |
| 634 | ZZ | Metal Shields | 4 | 16 | 0.3 | 5 | 5.1 | 37,000 | 1760 | 680 |
| 635 | / | Open | 5 | 19 | 0.3 | 6 | 8 | 40,000 | 2340 | 885 |
| 635 | ZZ | Metal Shields | 5 | 19 | 0.3 | 6 | 8 | 34,000 | 2340 | 885 |
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| 673 | / | Open | 3 | 6 | 0.08 | 2 | 0.2 | 71,000 | 242 | 94 |
| 673 | ZZ | Metal Shields | 3 | 6 | 0.08 | 2.5 | 0.2 | 60,000 | 242 | 94 |
| 674 | / | Open | 4 | 7 | 0.08 | 2 | 0.28 | 63,000 | 269 | 117 |
| 674 | ZZ | Metal Shields | 4 | 7 | 0.08 | 2.5 | 0.28 | 54,000 | 269 | 117 |
| 675 | / | Open | 5 | 8 | 0.08 | 2 | 0.32 | 57,000 | 292 | 142 |
| 675 | ZZ | Metal Shields | 5 | 8 | 0.08 | 2.5 | 0.32 | 49,000 | 292 | 142 |
| 676 | / | Open | 6 | 10 | 0.1 | 2.5 | 0.65 | 51,000 | 530 | 240 |
| 676 | ZZ | Metal Shields | 6 | 10 | 0.1 | 3 | 0.65 | 43,000 | 530 | 240 |
| 676 | 2RS | Rubber Seals | 6 | 10 | 0.1 | 3 | 0.65 | 43,000 | 530 | 240 |
| 677 | / | Open | 7 | 11 | 0.1 | 2.5 | 0.67 | 47,000 | 555 | 269 |
| 677 | 2RS | Rubber Seals | 7 | 11 | 0.1 | 3 | 0.67 | 40,000 | 555 | 269 |
| 677 | ZZ | Metal Shields | 7 | 11 | 0.1 | 3 | 0.67 | 40,000 | 555 | 269 |
| 678 | / | Open | 8 | 12 | 0.1 | 2.5 | 0.75 | 45,000 | 575 | 298 |
| 678 | 2RS | Rubber Seals | 8 | 12 | 0.1 | 3.5 | 0.75 | 38,000 | 575 | 298 |
| 678 | ZZ | Metal Shields | 8 | 12 | 0.1 | 3.5 | 0.75 | 38,000 | 575 | 298 |
| 679 | / | Open | 9 | 14 | 0.1 | 3 | 1.4 | 42,000 | 920 | 465 |
| 679 | 2RS | Rubber Seals | 9 | 14 | 0.1 | 4.5 | 1.4 | 36,000 | 920 | 465 |
| 679 | ZZ | Metal Shields | 9 | 14 | 0.1 | 4.5 | 1.4 | 36,000 | 920 | 465 |
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| 683 | / | Open | 3 | 7 | 0.1 | 2 | 0.33 | 68,000 | 390 | 130 |
| 683 | ZZ | Metal Shields | 3 | 7 | 0.1 | 3 | 0.33 | 58,000 | 390 | 130 |
| 684 | / | Open | 4 | 9 | 0.1 | 2.5 | 0.67 | 57,000 | 640 | 224 |
| 684 | ZZ | Metal Shields | 4 | 9 | 0.1 | 4 | 0.67 | 49,000 | 640 | 224 |
| 685 | / | Open | 5 | 11 | 0.15 | 3 | 1.1 | 51,000 | 715 | 282 |
| 685 | ZZ | Metal Shields | 5 | 11 | 0.15 | 5 | 1.1 | 43,000 | 715 | 282 |
| 686 | / | Open | 6 | 13 | 0.15 | 3.5 | 1.9 | 46,000 | 1080 | 440 |
| 686 | ZZ | Metal Shields | 6 | 13 | 0.15 | 5 | 1.9 | 39,000 | 1080 | 440 |
| 686 | 2RS | Rubber Seals | 6 | 13 | 0.15 | 5 | 1.9 | 39,000 | 1080 | 440 |
| 687 | / | Open | 7 | 14 | 0.15 | 3.5 | 2.1 | 44,000 | 1170 | 510 |
| 687 | 2RS | Rubber Seals | 7 | 14 | 0.15 | 5 | 2.1 | 37,000 | 1170 | 510 |
| 687 | ZZ | Metal Shields | 7 | 14 | 0.15 | 5 | 2.1 | 37,000 | 1170 | 510 |
| 688 | / | Open | 8 | 16 | 0.2 | 4 | 3.1 | 41,000 | 1260 | 585 |
| 688 | 2RS | Rubber Seals | 8 | 16 | 0.2 | 5 | 3.1 | 35,000 | 1260 | 585 |
| 688 | ZZ | Metal Shields | 8 | 16 | 0.2 | 5 | 3.1 | 35,000 | 1260 | 585 |
| 689 | / | Open | 9 | 17 | 0.2 | 4 | 3.2 | 39,000 | 1720 | 820 |
| 689 | 2RS | Rubber Seals | 9 | 17 | 0.2 | 5 | 3.2 | 33,000 | 1720 | 820 |
| 689 | ZZ | Metal Shields | 9 | 17 | 0.2 | 5 | 3.2 | 33,000 | 1720 | 820 |
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| 693 | / | Open | 3 | 8 | 0.15 | 3 | 0.61 | 63,000 | 560 | 180 |
| 693 | ZZ | Metal Shields | 3 | 8 | 0.15 | 4 | 0.61 | 54,000 | 560 | 180 |
| 694 | / | Open | 4 | 11 | 0.15 | 4 | 1.8 | 52,000 | 715 | 276 |
| 694 | ZZ | Metal Shields | 4 | 11 | 0.15 | 4 | 1.8 | 45,000 | 715 | 276 |
| 695 | / | Open | 5 | 13 | 0.2 | 4 | 2.4 | 47,000 | 1080 | 430 |
| 695 | ZZ | Metal Shields | 5 | 13 | 0.2 | 4 | 2.4 | 40,000 | 1080 | 430 |
| 696 | / | Open | 6 | 15 | 0.2 | 5 | 3.8 | 44,000 | 1350 | 530 |
| 696 | ZZ | Metal Shields | 6 | 15 | 0.2 | 5 | 3.8 | 37,000 | 1350 | 530 |
| 696 | 2RS | Rubber Seals | 6 | 15 | 0.2 | 5 | 3.8 | 37,000 | 1350 | 530 |
| 697 | / | Open | 7 | 17 | 0.3 | 5 | 5.2 | 41,000 | 1610 | 715 |
| 697 | 2RS | Rubber Seals | 7 | 17 | 0.3 | 5 | 5.2 | 35,000 | 1610 | 715 |
| 697 | ZZ | Metal Shields | 7 | 17 | 0.3 | 5 | 5.2 | 35,000 | 1610 | 715 |
| 698 | / | Open | 8 | 19 | 0.3 | 6 | 7.3 | 39,000 | 1990 | 865 |
| 698 | 2RS | Rubber Seals | 8 | 19 | 0.3 | 6 | 7.3 | 33,000 | 1990 | 865 |
| 698 | ZZ | Metal Shields | 8 | 19 | 0.3 | 6 | 7.3 | 33,000 | 1990 | 865 |
| 699 | / | Open | 9 | 20 | 0.3 | 6 | 8.2 | 38,000 | 2480 | 1090 |
| 699 | 2RS | Rubber Seals | 9 | 20 | 0.3 | 6 | 8.2 | 32,000 | 2480 | 1090 |
| 699 | ZZ | Metal Shields | 9 | 20 | 0.3 | 6 | 8.2 | 32,000 | 2480 | 1090 |
| Product | Models | Type | Bore Diameter (d) (mm) | Outer Diameter (D) (mm) | Chamfer Dimension (r) (mm) | Width (B) (mm) | Weight (g) | Limiting Speed (rpm) | Dynamic Load Rating (Cr) (N) | Static Load Rating (Cor) (N) |
| R2 | / | Open | 0.125 | 0.375 | 0.012 | 0.156 | 1.3 | 58,000 | 144 | 50.4 |
| R2 | 2RS | Rubber Seals | 0.125 | 0.375 | 0.012 | 0.156 | 1.3 | 49,000 | 144 | 50.4 |
| R2 | ZZ | Metal Shields | 0.125 | 0.375 | 0.012 | 0.156 | 1.3 | 49,000 | 144 | 50.4 |
| R3 | / | Open | 0.187 | 0.5 | 0.012 | 0.156 | 2.2 | 48,000 | 294.75 | 110.25 |
| R3 | 2RS | Rubber Seals | 0.187 | 0.5 | 0.012 | 0.156 | 2.2 | 41,000 | 294.75 | 110.25 |
| R3 | ZZ | Metal Shields | 0.187 | 0.5 | 0.012 | 0.156 | 2.2 | 41,000 | 294.75 | 110.25 |
| R4 | / | Open | 0.250 | 0.625 | 0.012 | 0.196 | 4.4 | 43,000 | 333 | 138.375 |
| R4 | 2RS | Rubber Seals | 0.250 | 0.625 | 0.012 | 0.196 | 4.4 | 36,000 | 333 | 138.375 |
| R4 | ZZ | Metal Shields | 0.250 | 0.625 | 0.012 | 0.196 | 4.4 | 36,000 | 333 | 138.375 |
| R4A | / | Open | 0.250 | 0.75 | 0.016 | 0.219 | 7.48 | 40,000 | 526.5 | 199.125 |
| R4A | 2RS | Rubber Seals | 0.250 | 0.75 | 0.016 | 0.219 | 7.48 | 34,000 | 526.5 | 199.125 |
| R4A | ZZ | Metal Shields | 0.250 | 0.75 | 0.016 | 0.219 | 7.48 | 34,000 | 526.5 | 199.125 |
| R6 | / | Open | 0.375 | 0.875 | 0.016 | 0.2188 | 9.02 | 37,000 | 735.15 | 316.996 |
| R6 | 2RS | Rubber Seals | 0.375 | 0.875 | 0.016 | 0.2812 | 9.02 | 31,000 | 735.15 | 316.996 |
| R6 | ZZ | Metal Shields | 0.375 | 0.875 | 0.016 | 0.2812 | 9.02 | 31,000 | 735.15 | 316.996 |
| R8 | / | Open | 0.5 | 1.125 | 0.016 | 0.2500 | 18 | 30,000 | 1150.17 | 540.018 |
| R8 | 2RS | Rubber Seals | 0.5 | 1.125 | 0.016 | 0.3125 | 18 | 26,000 | 1150.17 | 540.018 |
| R8 | ZZ | Metal Shields | 0.5 | 1.125 | 0.016 | 0.3125 | 18 | 26,000 | 1150.17 | 540.018 |
| R10 | / | Open | 0.625 | 1.375 | 0.031 | 0.2812 | 37 | 24,000 | 1340.15 | 727.96 |
| R10 | 2RS | Rubber Seals | 0.625 | 1.375 | 0.031 | 0.3438 | 37 | 20,000 | 1340.15 | 727.96 |
| R10 | ZZ | Metal Shields | 0.625 | 1.375 | 0.031 | 0.3438 | 37 | 20,000 | 1340.15 | 727.96 |
Miniature Ball Bearings: Application
Miniature ball bearings are widely used in electric motors and micro drive systems, offering smooth rotation, low noise,
and reliable performance in compact, high-speed motor applications.
Automotive
Drone/UVA
Robotics
Fitness Equipment
Gearboxes
Food Machinery
Agricultural Machinery
Home Appliances
Miniature Ball Bearings: Customization & OEM/ODM
BTON provides professional OEM and customization support specifically for miniature ball bearings. Our engineering team works closely with customers to develop compact, low-noise, and high-precision bearing solutions tailored to micro-scale assemblies,
high-speed operation, and space-constrained applications.
Customizable Options:
• 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: BTON 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, BTON offers comprehensive OEM and ODM services to ensure consistent quality, reliable performance, and stable mass production.
Miniature Ball Bearings: Quality Control & Inspection
To ensure stable performance and consistent quality in miniature and precision applications, BTON implements strict quality control and inspection procedures throughout the entire production process.
Key quality control measures include:
• Dimensional Accuracy Control: Critical dimensions are strictly inspected to ensure tight tolerances and consistent fit in miniature and space-constrained assemblies.
• Rotational Accuracy & Noise Testing: Miniature ball bearings are tested for smooth rotation, vibration level, and noise performance to meet the requirements of precision and low-noise applications.
• Starting Torque & Speed Performance Verification: Functional testing is conducted to verify low starting torque and stable operation under high-speed and continuous running conditions.
• Final Inspection & Batch Consistency: Each production batch undergoes final inspection to ensure compliance with technical specifications and stable batch-to-batch performance before shipment.
FAQ of Miniature Ball Bearings
What size are miniature bearings?
Miniature bearings typically have an inner diameter below 10 mm, with common sizes ranging from 1 mm to 9 mm. They are designed for compact assemblies where space is limited.
What are the different types of miniature bearings?
Miniature bearings are commonly classified by structure and design, including deep groove ball bearings, flanged miniature bearings, stainless steel miniature bearings, and precision miniature bearings. They are available in open, shielded (ZZ), and sealed (RS) types to suit different space, speed, and environmental requirements.
What are the different types of miniature bearings?
Miniature bearings are commonly available as deep groove ball bearings, flanged miniature bearings, stainless steel miniature bearings, and precision miniature bearings, with open, shielded (ZZ), or sealed (RS) designs.
Are miniature ball bearings suitable for high-speed applications?
Yes. Their compact design and precision raceways provide low friction and stable performance in high-speed, light-load applications.
Can miniature ball bearings be customized?
Yes. Custom options include materials, sealing types, internal clearance, lubrication, and OEM/ODM solutions for specific applications.
Contact BTON Technical Experts
Submit your requirements and our engineers will review your inquiry and respond
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Engineering & Application Support
Our technical specialists will review your inquiry and contact you promptly to provide professional recommendations
and application support.
- Office Add: 1-1904 NO.88 Zhongshan Road, Wuxi, Jiangsu, China
- E-mail: sales@bt-bearings.com
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