KET 691X / 691XZZ Metric Miniature Ball Bearing (1.5x5x2mm) - Ultra-Precision Micro Bearing

Product Description:

Core Selling Points

• Ultra-Micro Dimensions: Precision engineered with a 1.5mm inner diameter and 5mm outer diameter for extremely space-constrained mechanisms.

• High-Speed Performance: Capable of reaching up to 100,000 RPM with oil lubrication (85,000 RPM with grease), ensuring flawless stability in high-speed micro-motors.

• Reliable Load Capacity: Delivers a robust 237 N basic dynamic load rating and 69 N static load rating despite its miniature footprint.

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

Detailed Overview The KET 691X series deep groove ball bearing is an ultra-precision component designed strictly for advanced, high-speed miniature mechanical systems. Established in 2008 in Ningbo, Zhejiang Province, our manufacturing facility operates under the internationally registered trademark "KET," supplying world-class metric miniature bearings to global OEM markets. The 691X model provides an optimal balance of extreme miniaturization and structural integrity, delivering true-to-design dimensional accuracy with every batch.

Exact Technical Specifications

• Brand: KET

• Model Variants: 691X (Open Type) / 691Xzz (Shielded Type)

• Inner Diameter (d): 1.5 mm

• Outer Diameter (D): 5 mm

• Width / Thickness (B/B1): 2 mm (Open) / 2.6 mm (Shielded)

• Chamfer (r): 0.15 mm

• Basic Dynamic Load Rating (Cr): 237 N

• Basic Static Load Rating (Cor): 69 N

• Limiting Speed (Grease Lubrication): Up to 85,000 RPM

• Limiting Speed (Oil Lubrication): Up to 100,000 RPM

Primary Industrial Applications The KET 1-9mm inner diameter ultra-miniature series is highly versatile and trusted by global precision engineers. The 691X metric bearing is specifically ideal for:

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

• Remote control UAVs (Drones) and aerospace micro-mechanisms.

• Advanced medical equipment and delicate surgical/dental tools.

• Platinum jewelry manufacturing equipment and precision 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.