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When your application demands a bearing that fits into a narrow radial envelope without sacrificing load capacity, the wrong choice means premature failure, vibration, and unplanned downtime. Engineers, robotics builders, and equipment repair technicians working with compact drivetrains, servo motors, and precision spindles need a thin-wall deep groove ball bearing they can spec with confidence across a wide size range.
These 61900–61920ZZ deep groove ball bearings feature a chrome steel (GCr15) raceway and cage assembly enclosed by double-sided metal shields (ZZ). The series spans 21 standard sizes from 61900ZZ (10×22×6 mm / 0.394"×0.866"×0.236") through 61920ZZ (100×140×20 mm / 3.937"×5.512"×0.787"), with bore diameters from 10 mm to 100 mm and outer diameters from 22 mm to 140 mm. Available in packs of 1, 2, or 5 pieces.
Typical use cases include brushless DC motor front and rear shaft support, robotic joint pivot bearings for 6-axis arms, CNC spindle cartridge replacement, skateboard and inline skate wheel axles, and medical device actuator assemblies — all applications where the thin-wall 619xx profile is the standard fit.
Both sides sealed with pressed-steel shields that retain grease and block coarse particulate contamination without adding significant drag — suitable for moderate-speed, lightly contaminated environments.
Covers 61900ZZ through 61920ZZ in a single product, letting you order multiple sizes in one transaction. Bore steps follow the standard 619xx series progression from 10 mm to 100 mm.
The 619xx series uses a reduced radial cross-section compared to the 62xx and 63xx families, enabling use in compact housings where outer diameter clearance is the binding constraint.
Raceways and balls are manufactured from through-hardened GCr15 bearing steel, providing the hardness and fatigue resistance required for cyclic radial and light axial loading.
Each bearing is factory-greased with a general-purpose lithium-based grease suitable for operating temperatures typically between −20 °C and +120 °C (−4 °F to +248 °F). No additional lubrication required at installation.
Order 1, 2, or 5 pieces per variant to match your project scale — single-unit prototyping, paired shaft installations, or small-batch production runs.
| Series | 619xx ZZ (61900ZZ – 61920ZZ) |
|---|---|
| Bore Diameter (ID) | 10 mm – 100 mm (see variant options) |
| Outer Diameter (OD) | 22 mm – 140 mm (see variant options) |
| Width (Thickness) | 6 mm – 20 mm (see variant options) |
| Bearing Type | Deep Groove Ball Bearing, Thin Wall |
| Shield Type | Double Metal Shield (ZZ) |
| Material — Rings & Balls | Chrome Steel (GCr15 / 52100 equivalent) |
| Cage Material | Steel (stamped) |
| Lubrication | Pre-greased (lithium-based, general purpose) |
| Operating Temperature | Typically −20 °C to +120 °C (−4 °F to +248 °F) |
| Tolerance Class | See variant options |
| Radial Clearance | See variant options |
| Pack Quantities Available | 1 / 2 / 5 PCS |
| ISO Equivalent | ISO 619 series |
Match the bearing bore (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. The variant name lists the bearing number followed by ID×OD×Width in mm — for example, "61904ZZ – 20×37×9 mm" means a 20 mm bore, 37 mm OD, and 9 mm width. Measure your shaft and housing with calipers before ordering to confirm the fit.
The 619xx series has a thinner radial cross-section (smaller OD relative to bore) than the 62xx (light series) or 63xx (medium series). This makes 619xx bearings the right choice when the housing outer diameter is constrained, but it also means lower dynamic load ratings compared to wider-section bearings of the same bore size. If load capacity is the priority and space allows, consider the 62xx series instead.
The ZZ metal shield design is appropriate for moderate speeds. The limiting speed depends on the specific size — smaller bearings (e.g., 61900ZZ) tolerate higher RPM than larger ones (e.g., 61920ZZ). For very high-speed spindle applications, open or rubber-sealed (2RS) variants with lower-viscosity grease or oil lubrication may be more appropriate. Contact us to confirm suitability for your specific speed requirement.
Deep groove ball bearings can accommodate moderate axial loads in addition to radial loads, but they are not designed as primary thrust bearings. For applications with dominant axial loading, angular contact or thrust bearings are the correct choice. These 619xx ZZ bearings are well-suited for combined radial and light axial loads typical in motors, fans, and robotic joints.
The pressed-steel ZZ shields on these bearings are snap-fit and can be carefully removed with a thin tool for re-lubrication, but this is generally not recommended for precision applications as shield re-seating can affect concentricity. For applications requiring periodic re-lubrication, consider open bearings with external grease fittings or sealed (2RS) variants with replaceable seals.
These bearings are pre-filled with a general-purpose lithium-based grease suitable for standard industrial and mechanical applications. This grease is not food-grade (NSF H1) and is not rated for aggressive chemical or washdown environments. For food processing, pharmaceutical, or corrosive environments, contact us to confirm options or specify a compatible re-lubrication grease.
Always apply installation force to the ring being press-fitted — inner ring when pressing onto a shaft, outer ring when pressing into a housing. Never drive force through the balls by pressing on the opposite ring. Use a bearing press or a correctly sized sleeve that contacts only the ring face. For interference fits, heating the housing or chilling the shaft can reduce the force required and minimize the risk of race deformation.
