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.
635 ZZ Deep Groove Ball Bearing 5×19×6 mm | ISO 63 Series – Extra Light | Double Shielded
This precision miniature bearing utilizes a standard deep groove geometry, engineered for reliable, high-speed operation up to 36,000 r/min (Oil). It supports considerable radial loads and accommodates moderate axial loads in both directions. With its 5 mm bore and integrated double-shield design, the 635-ZZ is an excellent component for small precision instruments, compact electric motors, and applications operating in dusty or particulate-laden environments.

Ideal for various precision and industrial applications requiring both compact size and environmental resilience:
Steel shields on both sides create an effective barrier against dust and particulate ingress without contacting internal components. This design preserves lubricant, extends maintenance cycles, and ensures low rotational torque for efficient performance.
Built to light series dimensions (5×19×6 mm), this bearing offers substantial radial load capacity and handles moderate axial loads within a minimal footprint. Its design provides a balance of strength and compactness for tightly engineered assemblies.
Available with precision grades up to ABEC 5 (P5), the 635-ZZ incorporates optimized internal geometry to reduce friction and vibration. This ensures smooth, consistent, and reliable operation at elevated rotational speeds in demanding applications.
| Bearing Type | Single Row Deep Groove Ball Bearing |
| ISO Dimension Series | 63 Series – Extra Light |
| Basic Designation | 635 |
| Suffix | ZZ (Double Steel Shields) |
| Bore Diameter (d) | 5 mm |
| Outer Diameter (D) | 19 mm |
| Width (B) | 6 mm |
| Material (Races & Balls) | Chrome Steel (GCr15 / SAE 52100) |
| Precision Class | Standard / P5 Grade Available |
| Cage Material | Steel Stamped |
| Dynamic Load Rating (Cʳ) | 3.35 kN |
| Static Load Rating (C₀ʳ) | 1.42 kN |
| Limiting Speed (Grease) | 28,000 r/min |
| Limiting Speed (Oil) | 36,000 r/min |
| Weight (approx.) | 9.5 g |
Compatible replacements include:
The 635-ZZ comes standard with dual pressed steel shields, providing a balanced solution between contamination protection and low-friction operation. For environments requiring complete sealing against moisture or fine contaminants, the double rubber-sealed version (635-2RS) is also available.
"Ideal for compact, high-speed mechanisms such as small precision instruments and micro motors. The 635-ZZ combines effective dust resistance with smooth, reliable performance, making it a key component where size and speed are critical."
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Details
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Details
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Details
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