SKF 6308 2RS C3 Sealed Deep Groove Ball Bearing (40 x 90 x 23 mm)

Applications & Typical Uses

The SKF 6308 2RS C3 is a sealed single-row deep groove ball bearing designed for demanding industrial applications where low maintenance, high reliability, and stability under variable conditions are essential. Its dimensions — 40 mm bore x 90 mm outer diameter x 23 mm width — make it suitable for medium-size motors, gearboxes, pumps, fans, machine spindles, and heavy-duty rotating equipment.
Because it includes dual rubber seals (2RS), it is particularly well suited to operations exposed to dust, moisture, or contamination, enabling it to retain lubricant and protect internal surfaces. The C3 internal clearance variant allows internal tolerance for thermal expansion and small shaft deflections, avoiding binding or excessive stress under load or elevated temperature.

This bearing is commonly used as a unit bearing or integrated into bearing housings, enabling straightforward retrofits or new machine designs in sectors such as manufacturing, processing, power generation, or heavy machinery.

Benefits & Key Features

• Dual rubber sealing (2RS): Protects against ingress of dust, particles, and moisture, while maintaining internal lubrication.

• Deep groove geometry: Enables smooth, low-friction operation and supports both radial and moderate axial loads in both directions.

• C3 internal clearance: Provides extra internal space for thermal growth and dynamic movement without risking jamming.

• Balanced durability: The 40x90x23 mm size provides a solid compromise of load capacity and compactness for many industrial layouts.

• Reduced maintenance demands: Sealed design and robust construction mean fewer interventions, which is critical in continuous processes.

• Versatile integration: Suitable for incorporation in bearing housings, flanged units, or as standalone bearing elements.

Technical Data Snapshot

• Bore (d): 40 mm

• Outer diameter (D): 90 mm

• Width (B): 23 mm

• Seal type: 2RS - rubber seals on both sides

• Internal clearance: C3 (greater than standard)

• Dynamic load rating: ~ 42.3 kN

• Static load rating: ~ 24 kN

• Typical limiting speed: ~ 5 000 rpm (sealed)

• Construction: single-row deep groove, steel cage

• Typical weight: ~ 0.63 kg

These parameters make the 6308 2RS C3 a robust and reliable choice in many engineering contexts.

FAQ (Frequently Asked Questions)

Q: What do “2RS” and “C3” mean in the designation?
A: “2RS” indicates rubber contact seals on both sides of the bearing, protecting interior parts and keeping lubricant retained. “C3” denotes a larger-than-standard internal clearance, allowing room for thermal expansion or shaft misalignment.

Q: Can this bearing handle axial loads?
A: Yes — although its primary capacity is radial load support, the deep groove design allows it to carry moderate axial loads in both directions.

Q: What environments is 6308 2RS C3 suitable for?
A: It is ideal for industrial settings with dust, moisture, or contamination. It also performs well under temperature variation, moderate speeds, and mechanical stress.

Q: How do I integrate this bearing in a machine assembly?
A: It can be mounted within standard bearing housings, as part of modular units, or direct into shafts. Make sure clearance, alignment, and fits are appropriate for the C3 variant.

Q: What is the availability and delivery time?
A: We stock this bearing in Lublin. Magazyn i Sklep: Lublin, ul. Smoluchowskiego 1, budynek 4. Dostawa 24h - szybka realizacja zamówień.