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.
637 ZZ Deep Groove Ball Bearing 7×26×9 mm | ISO 68 Series – Extra Light | Double Shielded
This precision deep groove ball bearing is engineered for dependable high-speed performance, operating smoothly at speeds up to 34,000 r/min (Oil). It supports moderate radial loads and can accommodate light axial loads in both directions. With its 7 mm bore and non-contact double-shield design, the 637-ZZ is an excellent component for small precision mechanisms, micro motors, and applications where effective dust protection is required without compromising on speed.

Suited for a wide variety of precision and compact applications where size, speed, and protection are equally important:
Dual steel shields (ZZ) create a reliable, non-contact barrier against dust and particulate ingress. This design helps preserve the internal lubricant, extends service intervals, and maintains very low rotational friction for efficient operation.
Manufactured to extra-light series dimensions (7×26×9 mm), this bearing offers a favorable balance of radial load capacity and a compact yet stable form factor, making it ideal for applications where space is constrained but consistent performance is critical.
Available with precision grades up to ABEC 5 (P5), the 637-ZZ features optimized internal geometry to minimize vibration and noise, ensuring reliable, smooth, and quiet performance even at elevated rotational speeds.
| Bearing Type | Single Row Deep Groove Ball Bearing |
| ISO Dimension Series | 63 Series – Extra Light |
| Basic Designation | 637 |
| Suffix | ZZ (Double Steel Shields) |
| Bore Diameter (d) | 7 mm |
| Outer Diameter (D) | 26 mm |
| Width (B) | 9 mm |
| Material (Races & Balls) | Chrome Steel (GCr15 / SAE 52100) |
| Precision Class | Standard / P5 Grade Available |
| Cage Material | Steel Stamped |
| Dynamic Load Rating (Cʳ) | 4.65 kN |
| Static Load Rating (C₀ʳ) | 1.96 kN |
| Limiting Speed (Grease) | 26,000 r/min |
| Limiting Speed (Oil) | 34,000 r/min |
| Weight (approx.) | 13 g |
Common manufacturer equivalents include:
The 637-ZZ is supplied as a standard, pre-lubricated unit with dual pressed steel shields. This configuration provides an optimal balance between effective contamination protection and low running torque. For applications that require sealed protection against moisture or fine contaminants, the double rubber-sealed version (637-2RS) is available as an alternative.
"Ideal for miniature, high-speed applications such as micro motors and precision instruments, the 637-ZZ delivers reliable dust resistance, smooth operation, and a stable design in a compact package."
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.
Details
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.
Details
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.
Details
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Details
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.
Details
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 .
Details
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.
Details
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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