KET 691 Metric Miniature Ball Bearing (1x4x1.6mm) - Ultra-Precision Micro Bearing

Product Description:

Core Selling Points

• Ultra-Micro Dimensions: Precision engineered with a 1mm inner diameter and 4mm outer diameter for extremely space-constrained applications.

• Extreme Speed Capacity: Capable of reaching up to 120,000 RPM with oil lubrication, ensuring stable performance in high-speed micro mechanisms.

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

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

Detailed Overview The KET 691 series deep groove ball bearing is an ultra-precision component designed specifically 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. Providing a dynamic load rating of 140 N within a mere 1.6mm width profile, the 691 model perfectly balances extreme miniaturization with reliable structural integrity.

Key Technical Specifications

• Brand: KET

• Model: 691 (Open Type)

• Inner Diameter (d): 1 mm

• Outer Diameter (D): 4 mm

• Width / Thickness (B): 1.6 mm

• Chamfer (r): 0.1 mm

• Basic Dynamic Load Rating (Cr): 140 N

• Basic Static Load Rating (Cor): 36 N

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

• Limiting Speed (Oil Lubrication): Up to 120,000 RPM

Primary Industrial Applications The KET 1-4mm inner diameter ultra-miniature series is highly versatile and trusted by global precision engineers. The 691 metric bearing is specifically ideal for:

• High-speed dental drills, advanced medical equipment, and delicate surgical tools.

• Micro motors, compact cooling fans, and miniature robotic actuators.

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

• 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.