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

The 691-2RS represents the pinnacle of miniaturization in rolling bearing technology. Designed for ultra-precision assemblies where installation space is extremely restricted, this single-row bearing features a 1 mm bore, 4 mm outer diameter, and a 1.6 mm width. The "2RS" designation indicates high-quality contact rubber seals on both sides, providing superior protection against moisture, fine dust, and environmental contaminants compared to shielded versions. Pre-filled with premium synthetic grease, the 691-2RS ensures stable, low-noise rotation for sensitive electronic and medical micro-devices.

The 691 is an ultra-small, single-row miniature ball bearing designed for high-precision instruments and compact mechanical assemblies. With a 1 mm bore, 4 mm outer diameter, and 1.6 mm width, this open-type bearing is engineered to provide minimal friction and high-speed stability in extremely confined spaces. Its open configuration allows for low-torque performance and the flexibility to use specific precision oils or greases depending on the application’s RPM requirements.

The 697-ZZ is a precision-engineered, thin-wall miniature deep groove ball bearing designed for mechanical applications where radial space is strictly limited but reliable load capacity remains essential. Measuring 7×17×5 mm, this component belongs to the 6900 metric series, which is highly regarded for its low-profile cross-section. Outfitted with dual non-contact pressed metal shields (ZZ), it offers exceptional defense against dust and larger airborne contaminants without introducing any rotational drag. This frictionless shielding architecture guarantees high-velocity operation and superior heat dissipation, making it an ideal choice for compact, high-speed power transmission systems.

Purpose-built for mechanical assemblies requiring robust contamination exclusion without adding excessive weight or bulk to the housing, the 6902-2RS is a premium slim-profile deep groove ball bearing. Equipped with dual synthetic rubber contact seals (2RS), it offers superior protection against water spray, moisture, and fine particulate matter while securely locking in the factory-engineered grease. Because these heavy-duty rubber seals form a positive contact barrier with the inner ring, the 6902-2RS is exceptionally well-suited for environments exposed to outdoor elements, making it the top configuration for 15mm shaft assemblies, including bicycle wheel hubs, industrial electric motors, and outdoor automation systems.

The 6902 Open is a high-efficiency, single-row metric deep groove ball bearing optimized for applications requiring absolute minimal rotational resistance. Because it features an unshielded, open configuration, this model completely eliminates seal friction, allowing for exceptional high-speed performance and effortless oil or grease circulation. Featuring a standard 15 mm bore, 28 mm outer diameter, and 7 mm width, the 6902 provides an excellent, lightweight mechanical solution for precision machinery, electric motors, and high-performance bicycle components.

The 6912-2RS is a single-row, thin-section deep groove ball bearing from the ISO 6900 series, built for precision machinery where a large bore must be accommodated within a compact radial envelope. With a 60 mm bore, 85 mm outer diameter, and just 13 mm of width, this bearing delivers a radial cross-section of only 12.5 mm — making it the go-to selection when space constraints rule out a standard 6000 or 6200 series bearing of the same bore size. Double contact rubber seals (2RS) provide effective protection against contamination and retain grease throughout the bearing's service life, enabling maintenance-free operation in industrial robots, optical instruments, rotary encoders, stepping motors, and precision automation equipment. Also designated 61912-2RS under the current ISO numbering system, the 6912-2RS is fully interchangeable with major-brand equivalents from SKF, NSK, FAG, NTN, KOYO, and TIMKEN.

The 6910-ZZ is a single-row, thin-section deep groove ball bearing from the ISO 6900 series, fitted with double non-contact pressed-steel shields for light contamination protection at minimal drag penalty. Measuring 50 mm bore, 72 mm outer diameter, and 12 mm width, it belongs to the same slim-ring family as other 6900-series bearings but targets applications where the priority is speed capability and low running torque rather than maximum contamination exclusion. With a grease limiting speed of 9,000 r/min and an oil limiting speed of 11,000 r/min, the 6910-ZZ runs meaningfully faster than its rubber-sealed 6910-2RS counterpart — making it the preferred shielded configuration for precision motor spindles, encoder drives, servo actuators, and optical equipment rotating at sustained higher speeds within a compact 50 mm bore housing.

The 6910-2RS is a single-row, thin-section deep groove ball bearing from the ISO 6900 series, sealed on both faces with contact rubber lips for active exclusion of contaminants and reliable long-term grease retention. Sharing the same compact 50 × 72 × 12 mm envelope as the shielded 6910-ZZ, the 2RS variant makes a deliberate trade: it accepts a lower speed ceiling in exchange for a meaningful improvement in contamination exclusion — a worthwhile exchange in any precision application where the operating environment cannot be guaranteed clean. Factory pre-greased and permanently sealed, it is suited for industrial robots, outdoor automation equipment, laser systems, optical instruments, and stepping motor assemblies where fine dust, humidity, or occasional liquid exposure would otherwise shorten bearing life.