SKF 6203 ZZ C3 Sealed Deep-Groove Ball Bearing (17x40x12 mm)

Main Description

The SKF 6203 ZZ C3 is a premium deep-groove ball bearing designed for high-performance and reliable operation in industrial and mechanical systems. Its compact dimensions — 17 mm bore, 40 mm outer diameter, and 12 mm width — make it an excellent choice for small to medium assemblies where durability and sealing are critical.

Featuring ZZ metal shields on both sides, this bearing effectively protects the internal rolling elements from dust and other contaminants, while maintaining internal lubrication. This double-shield design helps to extend maintenance intervals and ensures stable, long-term performance in environments where contamination is a concern.

The C3 internal clearance provides additional radial space compared to standard bearings, allowing for thermal expansion and adjustment under high-speed or high-temperature operating conditions. This characteristic is especially valuable in machinery where dimensional changes occur during long operational cycles.

Built from high-grade bearing steel, the SKF 6203 ZZ C3 offers high durability, low friction, and excellent load-carrying capacity. Its robust design supports both radial and moderate axial loads, making it suitable for bearing housings, motor shafts, gearboxes, and rotary units in demanding industrial applications.

Due to its sealed and shielded construction, this technical ball bearing requires minimal maintenance, making it a cost-effective component for B2B customers who demand reliable performance over prolonged periods.

Technical Specifications

• Type: Single-row deep-groove ball bearing

• Model: 6203 ZZ C3

• Brand: SKF

• Bore (d): 17 mm

• Outer Diameter (D): 40 mm

• Width (B): 12 mm

• Shielding: ZZ (metal shields on both sides)

• Internal Clearance: C3 (greater than standard)

• Material: Bearing-grade steel

• Cage: Steel cage

• Typical Uses: Industrial motors, bearing housings, gearbox shafts, rotating assemblies

FAQ

Q1: What does “ZZ” mean in the bearing designation?
A1: “ZZ” indicates that the bearing has metal shields on both sides, offering protection against dust and maintaining internal lubrication without contact.

Q2: Why is the C3 clearance important?
A2: C3 clearance gives the bearing extra internal room to account for thermal expansion and high-speed operation, reducing the risk of binding under load.

Q3: In which applications is the 6203 ZZ C3 commonly used?
A3: It’s widely used in industrial machinery, motor shafts, gearbox units, bearing housings, and other applications requiring a sealed, low-maintenance bearing.

Q4: How does this bearing reduce maintenance?
A4: The double metal shields (ZZ) prevent contaminants from entering and trap lubricant inside, which lengthens service intervals and extends bearing life.