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Single row deep groove ball bearings with filling slots have a filling slot in both the inner and outer ring enabling more and larger balls to be incorporated than in standard deep groove ball bearings.
Filling slot bearings have a higher radial load carrying capacity than bearings without filling slots, but their axial load carrying capacity is small. They are also unable to operate at such high speeds as bearings without filling slots. Depending on the main application for which they are used, deep groove ball bearings with filling slots have a cage or no cage.
Cage |
No Cage |
The smaller sizes, which are mainly used for automotive gearboxes and are identified by a standard designation, incorporate a cage. The standard assortment of these bearings comprises
The large-size bearings which are designed for heavily loaded, slowly rotating applications are without cage.
The designation suffixes that occur most frequently with deep groove ball bearings with filling slots are listed below with their definitions.
| Designation | Definition |
|---|---|
| C3 | Radial internal clearance greater than Normal |
| N | Snap ring groove in the outer ring |
| NR | Snap ring groove in the outer ring, with appropriate snap ring |
| Z | Shield of pressed sheet steel on one side of the bearing |
| 2Z | Z shield on both sides of the bearing |
| ZNR | Shield of pressed sheet steel on one side of the bearing and snap ring groove in the outer ring with snap ring on the opposite side of the shield |
| 2ZNR | Z shield on both sides of the bearing and snap ring groove in the outer ring with snap ring |
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