61844-2RS Thin Wall Deep Groove Ball Bearing Double Rubber Sealed

Product Features and Advantages
Thin-Section and Lightweight Design: The 618 series features a constant-section thin-wall design with a low outside-diameter-to-bore-diameter ratio. With a 220 mm bore diameter, the 61844-2RS has an outside diameter of only 270 mm and a width of only 24 mm. This compact geometry saves installation space and reduces equipment weight, making it suitable for large-bore applications where radial space is restricted.
Advantages of Double-Sided 2RS Seals: The contact-type rubber seals help prevent dust, water splashes, and contaminants from entering the bearing. The bearing is factory pre-greased and generally does not require additional grease replenishment under normal operating conditions, simplifying maintenance. Compared with 2Z metal shields, the 2RS sealing configuration provides stronger protection against dust and water.
Load Capacity: The bearing is primarily designed to accommodate radial loads and can also support relatively small axial loads in both directions. It is not recommended for heavy shock loads or severe heavy-duty applications.
Low Friction and Low Noise: The bearing provides smooth operation and simple installation, with moderate requirements for shaft and housing alignment.
Standard Bearing Steel GCr15: Manufactured from hardened GCr15 bearing steel, it provides good wear resistance. P6/P5 precision grades can be customized for applications requiring higher dimensional and rotational accuracy.
Application Limitations: Due to its thin-section construction, the bearing is not suitable for heavy impact loads. The 2RS rubber seals are also not recommended for extremely high-speed applications or operating temperatures above 120°C.

Application Scenarios
The 61844-2RS is suitable for equipment requiring a large bore diameter, limited radial installation space, moderate operating speeds, good contamination protection, and reduced maintenance, including:
Construction Machinery: Auxiliary bearings for large slewing support systems, large winches, and slewing mechanisms
Automation Equipment: Large rotary tables, rotary worktables, and large indexing tables
Fans and Conveying Equipment: Large mesh-belt rollers, large fan impellers, and rotary drying equipment
Metallurgy and Packaging Machinery: Large winding equipment, large binding machinery, flash dryers, and rotary drying equipment
Machine Tool Accessories: Large chucks and rotating components of large fixtures
Other Applications: Large gearboxes, speed reducers, large wheel hubs, and rotating components of large testing fixtures
Selection Reminder: The 61844-2RS is not recommended for applications involving heavy loads and impact. For such conditions, thicker-section bearings from the 62 or 63 series should be considered instead.

Mounting Shoulder Dimensions — Assembly Reference
Minimum shaft shoulder diameter (da): ≥ 227 mm
Maximum housing shoulder diameter (Da): ≤ 263 mm
Maximum shaft/housing fillet radius (ra): ≤ 1.5 mm

Comparison with Similar Variants
61844-2Z: Features double-sided metal dust shields. It provides dust protection but is not designed for water protection. It generally permits higher operating speeds and requires periodic grease replenishment.
61844 (Open): An open, unsealed version with the highest speed capability among these configurations. It requires lubrication supplied by the equipment or lubrication system and provides no protection against dust or contaminants.
61844-2RS/C3: A version with increased internal clearance, suitable for shaft systems subject to greater temperature rise and thermal expansion.