KET R2-5 / R2-5ZZ Inch Miniature Ball Bearing (3.175x7.938x2.779mm) - High-Load Precision Micro Bearing

Product Description:

Core Selling Points

• Enhanced Heavy-Duty Capacity: Precision engineered with a 3.175mm (1/8") inner diameter and a widened 7.938mm (5/16") outer diameter, delivering a massive 560 N dynamic load rating for extremely demanding micro-applications.

• High-Speed Stability: Capable of reaching up to 67,000 RPM with oil lubrication and 60,000 RPM with grease, ensuring flawless operational stability under heavy radial stress.

• Exact Inch Specifications: Meticulously designed for North American and global assemblies requiring strict inch-based measurements for seamless mechanical integration.

• Factory-Direct Supply: Manufactured by Ningbo Kexiang Bearing Technology Co., Ltd. with a robust annual capacity of 100 million sets, securing highly competitive B2B wholesale pricing for global procurement.

Detailed Overview The KET R2-5 series deep groove ball bearing is a premium ultra-precision component belonging to our specialized Inch Miniature Series. Established in 2008 in Ningbo, Zhejiang Province, our highly automated manufacturing facility operates under the internationally registered trademark "KET," supplying world-class bearings to global OEM markets. The R2-5 model provides the ultimate balance of extreme miniaturization and rugged structural integrity, delivering true-to-design dimensional exactness with every production batch for clients utilizing inch-based engineering standards.

Exact Technical Specifications

• Brand: KET

• Model Variants: R2-5 (Open Type) / R2-5ZZ (Shielded Type)

• Inner Diameter (d): 3.175 mm (1/8 Inch)

• Outer Diameter (D): 7.938 mm (5/16 Inch)

• Width / Thickness (B/B1): 2.779 mm (Open) / 3.571 mm (Shielded)

• Chamfer (r): 0.1 mm

• Basic Dynamic Load Rating (Cr): 560 N

• Basic Static Load Rating (Cor): 179 N

• Limiting Speed (Grease Lubrication): Up to 60,000 RPM

• Limiting Speed (Oil Lubrication): Up to 67,000 RPM

Primary Industrial Applications The KET Inch Miniature Series is highly versatile and globally trusted by precision engineers, particularly in North American and European markets. Featuring a highly robust profile for its 1/8" bore class, the R2-5 bearing is specifically ideal for:

• Heavy-duty micro motors, high-load compact cooling fans, and miniature robotic actuators.

• Advanced medical equipment, high-stress dental drills, and delicate surgical tools.

• Remote control UAVs (Drones), RC models, and aerospace micro-mechanisms requiring extra radial stability.

• Platinum jewelry manufacturing equipment and precision scientific testing instruments.

Strategic Manufacturing Partner Qualifications

• Uncompromised Quality Control: 100% precision-tested utilizing state-of-the-art roundness instruments and automatic noise testing equipment prior to global shipment.

• Internationally Certified Quality Systems: We operate strictly under rigorous global quality management frameworks. We prioritize complete transparency with our B2B enterprise partners and proudly provide our official certifications upon request.

• Recognized Engineering Innovation: Our continuous investment in engineering R&D is validated by our official recognition as a High-Tech Enterprise and a Technology-Based SME in Zhejiang Province.

• Global Material Safety Compliance: We exclusively utilize premium raw materials that meet strict international safety directives, fully backed by our comprehensive third-party SGS laboratory testing reports.

Contact Us for Global Wholesale & Bulk Purchasing

Secure your mechanical supply chain with uncompromising engineering quality, true-to-design exactness, reliable delivery schedules, and competitive factory-direct pricing. Contact our international business development department today for B2B quotes, comprehensive technical datasheets, or to request evaluation samples.