KET R3 / R3ZZ Inch Miniature Ball Bearing (3/16" x 1/2") - Heavy-Duty Precision Micro Bearing

Product Description:

Core Selling Points

• Maximum Heavy-Duty Capacity: Precision engineered with a 4.762mm (3/16") inner diameter and an extra-thick 12.700mm (1/2") outer diameter, delivering a massive 1300 N dynamic load rating for the most extreme high-stress micro-applications [source: 1].

• High-Speed Stability: Capable of reaching up to 53,000 RPM with oil lubrication and 43,000 RPM with grease, ensuring flawless operational stability under severe radial and axial shock loads [source: 1].

• Exact Inch Specifications: Meticulously designed for North American and global assemblies requiring strict 3/16" inch-based engineering measurements for seamless mechanical integration [source: 1].

• 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 [source: 1].

Detailed Overview The KET R3 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 [source: 1]. The R3 model features an extra-thick cross-section, providing the ultimate balance of a compact 3/16" shaft size and unparalleled structural integrity. It delivers true-to-design dimensional exactness with every production batch for clients utilizing heavy-duty inch-based engineering standards.

Exact Technical Specifications

• Brand: KET [source: 1]

• Model Variants: R3 (Open Type) / R3ZZ (Shielded Type) [source: 1]

• Inner Diameter (d): 4.762 mm (3/16 Inch) [source: 1]

• Outer Diameter (D): 12.700 mm (1/2 Inch) [source: 1]

• Width / Thickness (B/B1): 3.967 mm (Open) / 4.978 mm (Shielded) [source: 1]

• Chamfer (r): 0.3 mm [source: 1]

• Basic Dynamic Load Rating (Cr): 1300 N [source: 1]

• Basic Static Load Rating (Cor): 485 N [source: 1]

• Limiting Speed (Grease Lubrication): Up to 43,000 RPM [source: 1]

• Limiting Speed (Oil Lubrication): Up to 53,000 RPM [source: 1]

Primary Industrial Applications The KET Inch Miniature Series is highly versatile and globally trusted by precision engineers, particularly in North American and European markets [source: 1]. Featuring the most robust profile in its 3/16" bore class, the R3 bearing is specifically ideal for:

• Heavy-duty industrial micro motors, high-load cooling fans, and large-scale robotic actuators [source: 1].

• Heavy-lift commercial UAVs (Drones), large RC models, and aerospace micro-mechanisms requiring maximum radial stability [source: 1].

• High-stress medical equipment, robust dental tools, and precision scientific testing instruments enduring high mechanical stress [source: 1].

Strategic Manufacturing Partner Qualifications

• Internationally Certified Quality Systems: We operate strictly under rigorous global quality management frameworks, proudly holding dual ISO9001 certifications [source: 4, 9] and the stringent automotive industry standard IATF16949 [source: 8].

• Recognized Engineering Innovation: Our continuous investment in engineering R&D is officially validated by our recognition as a High-Tech Enterprise [source: 5] and a Technology-Based SME in Zhejiang Province [source: 10].

• Global Material Safety Compliance: We exclusively utilize premium raw materials that meet strict international safety directives. Our products pass comprehensive third-party SGS laboratory testing for SVHC and RoHS compliance [source: 6, 7].

• Uncompromised Quality Control: 100% precision-tested utilizing state-of-the-art roundness instruments and automatic noise testing equipment prior to global shipment [source: 1].

Are You Reviewing Your Bearing Sourcing Costs? Let's Talk. Many engineering and procurement teams are currently looking to balance premium quality with better cost control. If you are reviewing your supplier options for the upcoming purchasing cycle, I would be happy to share how we’ve helped similar businesses reduce their sourcing costs without compromising on high-load performance.

Reply to this email or reach out directly to discuss your specific requirements or to request free evaluation samples.

• Global Sales Representative: Ryan Fan

• Direct Email: ryan.fan@ketprecisionbearings.com

• WhatsApp: +86-18067291918

• Official Website: www.ketprecisionbearings.com