KET 681 / 681ZZ Metric Miniature Ball Bearing (1x3x1mm) - Ultra High-Speed Micro Bearing

Product Description:

Overview The KET 681 series deep groove ball bearing is an ultra-precision, ultra-micro component engineered specifically for extreme high-speed and strictly space-constrained mechanical applications. Manufactured by Ningbo Kexiang Bearing Technology Co., Ltd., a specialized and trusted precision bearing manufacturer established in 2008 in Ningbo, Zhejiang Province. Operating under our internationally registered trademark "KET," we supply highly precise metric miniature bearings to global B2B markets. With an impressive annual production volume of 100 million bearing sets, our highly automated manufacturing facilities ensure exceptionally stable supply chains and competitive factory-direct wholesale pricing for OEM manufacturers worldwide.

Key Technical Specifications

• Brand: KET

• Model Variants: 681 (Open Type) / 681zz (Shielded Type)

• Inner Diameter (d): 1 mm

• Outer Diameter (D): 3 mm

• Width / Thickness (B/B1): 1 mm (Open) / 1.5 mm (Shielded)

• Chamfer (r): 0.05 mm

• Basic Dynamic Load Rating (Cr): 80 N

• Basic Static Load Rating (Cor): 23 N

• Limiting Speed (Grease Lubrication): Up to 130,000 RPM

• Limiting Speed (Oil Lubrication): Up to 150,000 RPM

Primary Industrial Applications The KET 1-3mm inner diameter ultra-miniature series is highly versatile and trusted by global precision engineers. Featuring an incredibly compact 1x3x1mm profile combined with a massive speed limit of up to 150,000 RPM, the 681 bearing is specifically ideal for:

• High-speed dental drills and advanced medical equipment.

• Micro motors and compact cooling fans.

• Remote control UAVs (Drones) and micro-robotics.

• Platinum jewelry manufacturing equipment and delicate precision 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.