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Since 2010, Fujian Welink Bearing Technology Co., Ltd. has been a globally trusted leader in precision bearings, specializing in miniature deep-groove ball bearings. Our proprietary brand WELINK delivers premium quality and reliable performance rivaling international famous brands, with unbeatable cost-effectiveness that balances top-tier craftsmanship and competitive pricing. With three strategic R&D and production bases across Ningbo (Zhejiang), Ningde (Fujian), and Anhui, plus over 20,000㎡ advanced workshops, we ensure a comprehensive product range, stable supply, and rigorous quality control. Serving 50+ industries worldwide, Our precision bearings are extensively applied in:

All products

634 ZZ Deep Groove Ball Bearing for General Compact Machinery | 4x16x5 mm

The 634-ZZ is a Premium Miniature Deep Groove Ball Bearing engineered for applications that demand compactness and reliable performance. Featuring double metal shields (ZZ) on both sides, this precision metric bearing provides effective protection against dust and contaminants while ensuring low-friction operation. With a 4mm bore and a robust outer diameter, it is an ideal choice for small yet demanding applications such as precision instruments, high-performance micro-motors, and compact machinery where space is limited but durability is required.

635-ZZ Deep Groove Ball Bearing For Motors & Precision Devices | 5x19x6 mm

The 635-ZZ is a High-Performance Miniature Deep Groove Ball Bearing designed for applications demanding reliable operation with superior contamination resistance. Equipped with double metal shields (ZZ) on both sides, this metric bearing delivers effective protection against airborne particles and debris, preserving internal lubrication and ensuring smooth, long-lasting performance. With a compact 5mm bore, it serves as an essential component in small electromechanical devices, precision instruments, and compact motor assemblies where space-saving design and dependable shielding are critical.

637-ZZ Deep Groove Ball Bearing For Miniature High-Speed Devices & Precision Instruments | 7×26×9 mm

The 637-ZZ is a High-Precision Miniature Deep Groove Ball Bearing engineered for applications demanding smooth operation, contamination resistance, and reliable performance in compact spaces. With double steel shields (ZZ) securely fitted on both sides, this bearing provides effective protection against airborne dust and fine particles, preserving internal lubrication and ensuring consistently low torque. Featuring a 7mm bore, it is an essential component in small electromechanical devices, sensitive instrumentation, and miniature motor assemblies where space optimization and dependable shielding are crucial.

638-ZZ Deep Groove Ball Bearing For Compact Drives & Small Motors | 8×28×9 Mm

The 638-ZZ is a Double-Shielded Deep Groove Ball Bearing designed for dependable performance in compact and space-constrained applications. Built with the classic deep groove raceway design, this metric bearing effectively handles radial loads and light axial loads in both directions. With an 8 mm bore and a shielded (ZZ) design for contamination protection, it is an essential component for small electric motors, light-duty gear mechanisms, instruments, and various precision devices requiring smooth, low-maintenance operation.

6303 Deep Groove Ball Bearing – Versatile and Reliable for General Machinery and Motor Drives | 17×47×14 Mm

The 6303 is a Medium Series Deep Groove Ball Bearing in a standard open design, renowned for its balanced performance and wide applicability. Engineered without integral seals or shields, it offers maximum design flexibility and is ideal for applications where the bearing is incorporated into a pre-lubricated or regularly serviced assembly. With a 17 mm bore, a 47 mm outer diameter, and a 14 mm width, this bearing provides an optimal combination of compactness, load capacity, and speed capability for a diverse range of industrial and automotive uses.

6306 Open Deep Groove Ball Bearing for Medium-Duty Industrial Applications | 30×72×19 Mm

The 6306 is a Single Row, Medium Series Deep Groove Ball Bearing engineered for robust performance and versatility across a wide range of industrial applications. As an open-type bearing without integral seals or shields, it provides maximum design flexibility for custom sealing arrangements and optimal heat dissipation. With a 30 mm bore and a substantial 19 mm width, it offers a balanced combination of high load capacity and dimensional stability, making it a reliable choice for demanding machinery and power transmission systems.

6301-2RS Sealed Deep Groove Ball Bearing for Robust Medium-Duty Applications | 12×37×12 Mm

The 6301-2RS is a Double Rubber-Sealed, Medium Series Deep Groove Ball Bearing designed to deliver reliable performance and environmental protection in demanding conditions. Fitted with two integral rubber contact seals (2RS), it forms an effective barrier against contaminants such as dust, dirt, and moisture, while securely retaining lubricant within the bearing. With a 12 mm bore, 37 mm outer diameter, and a 12 mm width, this bearing offers an excellent balance of load capacity and compactness, making it ideal for medium-duty applications where sealing integrity is crucial.

6313-2Z Shielded Deep Groove Ball Bearing For Heavy-Duty Industrial Applications | 65×140×33 mm

The 6313-2Z is a Double Metal Shielded Medium Series Deep Groove Ball Bearing engineered to deliver robust and reliable performance in demanding industrial environments. Fitted with two non-contact metal shields (2Z) on both sides, it provides effective protection against larger contaminant particles while maintaining minimal friction for higher speed operation. With a 65 mm bore and substantial cross-section, this bearing is ideally suited for electric motors, pumps, industrial gearboxes, and heavy machinery operating in clean to moderately contaminated conditions.

6302 ZZ Versatile Deep Groove Ball Bearing For Electric Motors and Automation | 15×42×13 mm

The 6302 ZZ is a versatile, single-row deep groove ball bearing engineered for reliable performance in a broad spectrum of industrial and automation applications. Featuring dual Z-type metal shields, this bearing provides effective protection against dust and solid contaminants while maintaining low frictional torque. With a 15 mm bore and a 13 mm width, it is a popular choice for electric motors, pumps, and automotive components where balanced load capacity and contamination resistance are essential for extended service life.

6312 ZZ Robust Deep Groove Ball Bearing For Heavy-Duty Electric Motors | 60×130×31 mm

The 6312 ZZ is a robust, single-row deep groove ball bearing engineered for reliable performance in heavy-duty industrial applications requiring high load capacity and contamination resistance. Featuring dual Z-type metal shields, this bearing provides effective protection against dust and solid contaminants while maintaining low frictional torque. With a 60 mm bore and a 31 mm width, it is a preferred choice for large electric motors, pumps, and gearboxes where balanced load capacity and extended service life are essential.

6314 ZZ Heavy-duty Deep Groove Ball Bearing For Large Electric Motors | 70×150×35 mm

The 6314 ZZ is a heavy-duty, single-row deep groove ball bearing engineered for demanding industrial applications requiring high load capacity and reliable contamination protection. Featuring dual Z-type metal shields, this bearing provides effective defense against dust and solid debris while maintaining low frictional torque. With a 70 mm bore and 35 mm width, it is the preferred choice for large electric motors, pumps, and industrial gearboxes where robust performance and extended service life are critical.

6316 ZZ Durable Single-Row Deep Groove Ball Bearing For Heavy-Duty Industrial Machinery | 80×170×39 mm

The 6316 ZZ is a Single-Row Deep Groove Ball Bearing from the prestigious 6300 series, designed to deliver durable and consistent performance in medium to heavy-duty industrial applications. Featuring the classic deep groove raceway design, this metric bearing excels at accommodating substantial radial loads as well as bidirectional axial loads. With a robust 80mm bore, it is an essential component for larger electric motors, industrial pumps, heavy-duty gearboxes, and various machinery where dependable shaft support and operational smoothness are critical.

6322 ZZ Heavy-duty Single-Row Deep Groove Ball Bearing For Heavy Industrial Equipment | 110×240×50 mm

The 6322 ZZ is a heavy-duty Single-Row Deep Groove Ball Bearing engineered for reliable performance in large-scale industrial applications. Featuring a standardized deep groove raceway design, this metric bearing is built to accommodate very high radial loads while also handling moderate axial loads in both directions. With a 110 mm bore, it is an essential component for heavy electric motors, large pumps, industrial gearboxes, and mining equipment requiring robust load support and operational stability.

6324 Heavy-duty Single-Row Deep Groove Ball Bearing For Large-Scale Industrial Machinery | 120×260×55 mm

The 6324 is a heavy-duty Single-Row Deep Groove Ball Bearing engineered for reliable performance in large-scale industrial applications. Featuring a precision-ground deep groove raceway design, this metric bearing is built to accommodate very high radial loads while effectively handling moderate axial loads in both directions. With a 120 mm bore, it is an essential component for large electric motors, industrial pumps, heavy gearboxes, and mining equipment requiring robust load support and operational stability under demanding conditions.

6303-ZZ Double Metal Shielded Deep Groove Ball Bearing For Electric Motors And Industrial Machinery | 17×47×14 mm

The 6303-ZZ is a Double Metal Shielded Deep Groove Ball Bearing engineered for applications demanding reliable protection against dust and solid contaminants while maintaining high-speed capability. Equipped with two non-contact metal shields (ZZ) on both sides, this bearing effectively prevents ingress of larger particles and retains grease lubrication with minimal friction. With a 17 mm bore, it is a versatile choice for electric motors, pumps, compressors, and industrial equipment where compact dimensions, moderate load capacity, and long service life are required.

6305-2RS Double Rubber-Sealed Deep Groove Ball Bearing For Electric Motors And Industrial Equipment | 25×62×17 mm

The 6305-2RS is a Double Rubber-Sealed Deep Groove Ball Bearing engineered to deliver reliable performance in demanding environments where protection against moisture, dust, and contaminants is essential. Fitted with two synthetic rubber contact seals (2RS) on both sides, this bearing ensures effective lubrication retention and prevents ingress of fine particles or fluids. Featuring a 25 mm bore, it is an ideal choice for electric motors, pumps, gearboxes, and industrial machinery requiring robust sealing and smooth operation under moderate to heavy loads .

6305-ZZ Deep Groove Ball Bearing For Electric Motors & Industrial Applications | 25x62x17 mm

The 6305-ZZ is a Premium Single Row Deep Groove Ball Bearing designed for demanding applications that require reliable performance and durability. Featuring double metal shields (ZZ) on both sides, this metric bearing provides effective protection against dust and contamination while maintaining low rotational friction. With a 25mm bore, 62mm outer diameter, and 17mm width, it is ideal for electric motors, pumps, gearboxes, conveyors, and various machinery where robust construction and long service life are essential.

6308 Premium Deep Groove Ball Bearing For Industrial Machinery & Electric Motors | 40x90x23 mm

The 6308 is a Premium Single Row Deep Groove Ball Bearing engineered for medium-to-heavy duty applications requiring reliable performance and extended service life. This metric bearing features an open design, allowing for flexible lubrication options and easy integration into various housing configurations. With a 40mm bore, 90mm outer diameter, and 23mm width, it is ideal for electric motors, pumps, gearboxes, industrial fans, and automotive components where robust construction and high load capacity are essential.

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