6910-ZZ Deep Groove Ball Bearing | 6900 Series Thin Section | Double Metal Shields | 50 × 72 × 12 mm

The 6907-2RS is a single-row, thin-section deep groove ball bearing from the ISO 6900 series, fitted with contact rubber lip seals on both faces. The seals bond to the outer ring and bear physically against a machined shoulder on the inner ring, forming a positive barrier that actively keeps fine dust, airborne particles, moisture, and light contamination away from the ball complement and grease fill. On a 35 mm shaft, the 6907-2RS delivers the 6900 series' compact 55 mm outer diameter alongside maintenance-free sealed operation — a pairing that makes it the bearing of choice wherever space is fixed, the environment is less than controlled, and re-lubrication access is impractical or simply not planned.

The 697-2RS is a single-row miniature deep groove ball bearing from the 600 series, sealed on both faces with contact rubber lip seals that engage the inner ring shoulder directly. At just 7 mm bore and 17 mm outer diameter, it occupies one of the smallest envelopes in the standard metric ball bearing catalogue while still delivering the contamination exclusion and grease retention that sealed construction provides. This combination — sub-20 mm outer diameter, contact rubber seals, and factory pre-fill — makes the 697-2RS the default choice for compact precision assemblies that run in dusty, humid, or mist-exposed surroundings where open or shielded miniature bearings would require additional housing protection to achieve comparable service life.

Designed specifically for space-constrained, large-shaft assemblies requiring high radial rigidity and minimized weight, the 6921-ZZ is a premium thin-section deep groove ball bearing. Outfitted with dual non-contact metallic shields (ZZ), it delivers exceptional defense against coarse dust and factory debris while ensuring reliable containment of the factory-applied lubrication. Because the metal shields avoid contact friction with the inner ring, the 6921-ZZ maintains minimal running torque and ultra-smooth rotation. This makes it an essential mechanical component for large-bore, weight-sensitive 105mm applications, including industrial robotic joints, heavy-duty rotary tables, and complex automated equipment.

Developed to support reliable radial and multi-directional axial loads within tight radial profiles, the 6921-2RS is a premium thin-section deep groove ball bearing equipped with dual synthetic rubber seals. Outfitted with heavy-duty contact seals (2RS), it provides a highly resilient barrier against fine dust, moisture, and particulate contaminants while preventing internal grease migration. Because these reinforced rubber lips maintain direct contact with the inner ring recess, the 6921-2RS ensures structural protection and lubrication retention in harsh environments. This makes it an invaluable mechanical component for large-bore, weight-sensitive 105mm shaft applications, including industrial robotic joints, heavy manufacturing automation, and rotating platforms.

Engineered for internal mechanical assemblies where external sealing is provided by the housing, the 6921 Open is a high-performance thin-section radial ball bearing. Completely unshielded and unsealed, this open-type configuration allows for unrestricted flow of fluid lubricants directly into the rolling elements. Because there are no physical barriers or rubbing seals, the 6921 Open achieves absolute zero shield-induced friction, ensuring optimal thermal dissipation and maximum rotational efficiency. It is the ideal component for heavy-duty 105mm shaft applications enclosed in oil bath environments, such as industrial transmissions, large centrifugal pumps, and enclosed machine tool spindles.

Designed for heavy-duty industrial applications where radial space is limited but environmental protection is paramount, the 6920-2RS is a high-performance thin-section deep groove ball bearing. Equipped with twin nitrile rubber contact seals (2RS), this bearing excels at locking in premium factory grease while completely blocking the ingress of moisture, dust, and abrasive particulate matter. While the contact seals introduce slightly more friction than unsealed or metal-shielded counterparts, they provide unparalleled longevity and reliability in harsh, contamination-prone operating environments, making the 6920-2RS an exceptional solution for 100mm bore requirements in gearboxes, large robotics, and agricultural equipment.

Engineered for internal mechanical applications where external contamination is not a factor, the 6918 is a premium open-type deep groove ball bearing. Featuring an unsealed, shield-free architecture, this bearing offers absolute zero seal friction, allowing the internal rolling elements to interact directly with oil-bath or circulating lubrication systems. This unrestricted flow makes the 6918 the ultimate choice for large-bore (90mm) applications requiring superior thermal dissipation and ultra-smooth rotation, such as heavy industrial transmissions, machine tool spindles, and aerospace components.

Engineered to deliver exceptional reliability in environments where radial space is restricted, the 6917-2RS is a premium thin-section deep groove ball bearing. Featuring dual nitrile rubber contact seals (2RS), this bearing is specifically designed to lock in factory lubrication while creating an impenetrable barrier against environmental contaminants like dust, moisture, and manufacturing debris. While rubber seals introduce a nominal increase in friction compared to open bearings, they drastically extend the service life of the component in exposed conditions. This makes the 6917-2RS an invaluable asset for 85mm bore applications, including packaging machinery, medium-duty gearboxes, and automated material handling systems.