KET MR72 / MR72ZZ Metric Miniature Ball Bearing (2x7x2.5mm / 3mm) - High-Load Precision Micro Bearing

Product Description:

Core Selling Points

• Maximum Load in Micro Class: Precision engineered with a 2mm inner diameter and an enlarged 7mm outer diameter, delivering a massive 385 N dynamic load rating for extremely demanding micro-applications.

• High-Speed Stability: Capable of reaching up to 75,000 RPM with oil lubrication and 63,000 RPM with grease, ensuring flawless operational stability under heavy radial stress.

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

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

Detailed Overview The KET MR72 series deep groove ball bearing is a premium ultra-precision component designed strictly for advanced miniature mechanical systems requiring maximum radial support without sacrificing space. Established in 2008 in Ningbo, Zhejiang Province, our highly automated manufacturing facility operates under the internationally registered trademark "KET," supplying world-class metric miniature bearings to global OEM markets. The MR72 model provides the ultimate balance of extreme miniaturization and rugged structural integrity, delivering true-to-design dimensional exactness with every production batch.

Exact Technical Specifications

• Brand: KET

• Model Variants: MR72 (Open Type) / MR72zz (Shielded Type)

• Inner Diameter (d): 2 mm

• Outer Diameter (D): 7 mm

• Width / Thickness (B/B1): 2.5 mm (Open) / 3 mm (Shielded)

• Chamfer (r): 0.15 mm

• Basic Dynamic Load Rating (Cr): 385 N

• Basic Static Load Rating (Cor): 127 N

• Limiting Speed (Grease Lubrication): Up to 63,000 RPM

• Limiting Speed (Oil Lubrication): Up to 75,000 RPM

Primary Industrial Applications The KET 1-9mm inner diameter ultra-miniature series is highly versatile and trusted by global precision engineers. Featuring a highly robust profile for its 2mm bore class, the MR72 metric bearing is specifically ideal for:

• High-speed micro motors, heavy-duty compact cooling fans, and miniature robotic actuators.

• Remote control UAVs (Drones) and aerospace micro-mechanisms requiring extreme radial stability.

• Advanced medical equipment and high-stress dental/surgical tools.

• Platinum jewelry manufacturing equipment and precision scientific testing instruments.

Why Choose KET Bearings as Your Strategic Manufacturing Partner?

• World-Class Manufacturing Facility: Located at No.555 Fengshou Road, Jiaochuan Street, Zhenhai District, Ningbo, Zhejiang, China, our advanced factory employs state-of-the-art testing equipment—including automatic noise tests and roundness instruments—to guarantee 100% precision and defect-free compliance.

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

• OEM & Customization Capabilities: Beyond our standard metric catalog, our specialized R&D team is fully equipped to design, engineer, and customize non-standard precision bearings tailored exactly to your unique project requirements.

Contact Us for Global Wholesale & Bulk Purchasing

Secure your mechanical supply chain with uncompromising engineering quality, 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.