SKF 635 ZZ Deep-Groove Ball Bearing (5x19x6 mm)

Main Description

The SKF 635 ZZ deep-groove ball bearing is a precision miniature bearing optimized for compact, high-speed applications. Measuring just 5 mm inner diameter, 19 mm outer diameter, and 6 mm width, this single-row bearing features metal shields on both sides (ZZ) that protect internal components from dust and contamination while retaining lubrication — making it exceptionally reliable for long-term use.

Designed for industrial applications, this bearing is especially useful in small motors, miniature gearboxes, robotics, automation units, instrumentation, and other space-constrained mechanical systems. Its shielded design ensures that the bearing stays clean, operates smoothly, and requires minimal maintenance.

Thanks to its high-precision steel construction and tight tolerances, the SKF 635 ZZ delivers stable rotational performance even under continuous operation. The bearing is well-suited for use in bearing units and housings, offering long service life, low friction, and excellent durability.

Technical Data

• Manufacturer: SKF

• Type: Deep-groove ball bearing, single row

• Model: 635 ZZ (also known as 635-2Z)

• Dimensions: 5 mm (ID) x 19 mm (OD) x 6 mm (width)

• Shielding: Metal shields on both sides (ZZ)

• Material: Bearing steel (rings and balls)

• Clearance / Internal Clearance: Standard radial clearance for reliable high-speed performance

FAQ

1. What does “ZZ” mean in the bearing name?
“ZZ” indicates that the bearing has metal shields on both sides, providing protection from dust and contaminants while preserving lubricant inside.

2. What are the typical uses for a 5x19x6 mm miniature bearing?
Ideal for compact and precision applications such as small electric motors, gearboxes, robotics, medical devices, and automation units.

3. Does the SKF 635 ZZ need additional lubrication?
In many cases, no. The shielded design comes pre-lubricated, and the metal shields help retain the grease, reducing the need for frequent relubrication.

4. Can this bearing spin at high speed?
Yes — the compact dimensions, high-quality steel, and precision design allow for reliable, low-friction rotation even at elevated speeds.

5. Is this bearing suitable for industrial use?
Absolutely. Its durability, shielded construction, and long service life make it well-suited for industrial applications where space and reliability matter.