618-5ZZ Ultra-Thin Miniature Ball Bearing | 5×11×3 mm for Micro-Robotics & Precision Instruments

The 6809-ZZ is a single-row, thin-section deep groove ball bearing from the 6800 series, fitted with non-contact pressed steel shields on both faces. Featuring a 45 mm bore and a highly compact 58 mm outer diameter, it occupies one of the slimmest profiles available for large-shaft metric ball bearings. This unique geometry—combining a large internal diameter with a minimal 7 mm cross-section—makes the 6809-ZZ the definitive choice for space-constrained assemblies where weight reduction and low-friction rotation are paramount. The double steel shields retain the factory grease fill while preventing the ingress of large particulate matter, ensuring extended service life without the thermal drag associated with rubber seals.

The 6809-2RS is a high-precision, single-row deep groove ball bearing belonging to the ultra-thin 6800 series. Equipped with dual-lip synthetic rubber contact seals on both sides, this bearing is engineered to deliver exceptional contamination exclusion and reliable grease retention within an extremely low-profile design. Featuring a 45 mm bore and a 58 mm outer diameter, it provides the ideal solution for large-shaft applications with severe radial space constraints. The factory-prefilled grease and robust rubber seals make the 6809-2RS the industry standard for compact, lightweight mechanisms operating in challenging environments containing dust, debris, or moisture.

The 6808-2RS is a single-row thin-section deep groove ball bearing from the 6800 series, fully sealed on both sides with contact rubber lips that ride directly against the inner ring shoulder. Featuring a 40 mm bore and a highly compact 52 mm outer diameter, it offers an exceptionally slim 7 mm cross-section. This geometry delivers essential weight reduction and space savings without sacrificing the contamination exclusion and long-term grease retention of a fully sealed unit. This combination—a large 40 mm bore within a narrow 52 mm envelope, integrated contact seals, and life-time lubrication—makes the 6808-2RS the optimal solution for precision machinery operating in dusty, damp, or debris-prone environments where standard-sized bearings would be too bulky or heavy.

The 6808 is a single-row, thin-section miniature deep groove ball bearing from the 6800 series, manufactured in an open configuration without shields or seals. Featuring a 40 mm bore and a highly compact 52 mm outer diameter, it delivers an extremely slim 7 mm cross-section. This open-type design is specifically engineered for internal machinery applications where the bearing operates within an already sealed housing, such as an oil bath or centralized lubrication system. By omitting the sealing components, the 6808 Open achieves the lowest possible starting and running torque, making it the premier choice for ultra-high-speed, space-constrained assemblies where frictional losses must be completely minimized.

Belonging to the ultra-compact 6800 series, the 6807-ZZ is a single-row, thin-section deep groove ball bearing equipped with dual metal shields. With a 35 mm bore, a 47 mm outer diameter, and a slim 7 mm profile, this bearing delivers exceptional space-saving advantages. Unlike open-type bearings, the 6807-ZZ features non-contact steel shields on both sides, making it a maintenance-free, factory-greased solution. It is specifically engineered to retain lubricants internally while effectively blocking dust, metallic shavings, and other external contaminants. This shielded configuration provides a perfect balance—offering robust environmental protection without introducing the heavy rotational drag associated with rubber seals, ensuring high-speed capability with minimal friction.

Engineered for uncompromising protection, the 6807-2RS is a single-row, thin-section deep groove ball bearing from the 6800 series, equipped with contact rubber seals on both sides. With a 35 mm inner bore and a 47 mm outer diameter, it maintains an ultra-slim 7 mm profile. Unlike open-type variants, this sealed design is purpose-built for external or exposed machinery where the bearing must defend against moisture, dust, and particulate contamination. Factory-packed with premium quality grease, the 6807-2RS locks in its own lubrication for the entirety of its lifespan. By utilizing heavy-duty NBR (Nitrile Butadiene Rubber) seals, this bearing minimizes maintenance requirements, making it the superior choice for space-constrained applications operating in demanding, less-than-clean environments.

Engineered specifically for applications where radial space is strictly limited and weight reduction is critical, the 6817-ZZ is a premium thin-section deep groove ball bearing from the 6800 extra-light series. Equipped with dual pressed-steel shields (ZZ), this bearing acts as a highly effective barrier against industrial debris while retaining its factory-filled lubrication. Because the metal shields are non-contacting, the 6817-ZZ minimizes rotational friction and startup torque, making it an exceptional solution for large-diameter shafts in lightweight machinery, robotic joints, and precision optical equipment.

Engineered for space-constrained industrial environments requiring an ultra-thin footprint, the 6813-2RS is a high-performance single-row deep groove ball bearing belonging to the 6800 thin-section series. Outfitted with dual premium synthetic rubber seals (2RS), this component delivers exceptional resistance against workplace dust, moisture, and fine particulate ingress while securely locking in the factory-applied lubricating grease. Because these contact seals provide a secure, tight barrier, the 6813-2RS guarantees maximum protection for internal components, making it an outstanding choice for 65mm shaft applications like industrial robotic joints, automation equipment, and high-end bicycle hubs.