691-2RS Ultra-Micro Deep Groove Ball Bearing | 1x4x1.6 mm Dual Rubber Sealed

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.

The 6907-ZZ is a single-row, thin-section deep groove ball bearing from the ISO 6900 series, shielded on both faces with pressed steel plates fixed to the outer ring. Unlike contact rubber seals, the ZZ shields maintain a controlled non-contact clearance with the inner ring — allowing meaningfully higher operating speeds while still providing practical defence against coarse particle ingress and grease escape. This deliberate configuration makes the 6907-ZZ the preferred choice when shaft speed is the governing constraint and the operating environment, while not clinically clean, is free of active liquid contamination. Factory pre-greased and ready to fit, it serves electric motors, high-speed spindles, optical instruments, stepping motor assemblies, and compact gearboxes where rotational efficiency and dimensional economy matter equally.

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.