SKF GEZ 108 ES-2RS Radial Spherical Plain Bearing
GEZ 108 ES-2RS is a maintenance-required, double-lip sealed imperial radial spherical plain bearing from SKF. Radial spherical plain bearings are engineered to accommodate radial loads, combined radial and axial loads, and significant misalignment in mechanical systems. This specific model features a steel/steel sliding contact surface combination, double-lip polyurethane contact seals on both sides, and lubrication holes with annular grooves in both rings for easy relubrication.
GEZ 108 ES-2RS is a maintenance-required, double-lip sealed imperial radial spherical plain bearing from SKF. Radial spherical plain bearings are engineered to accommodate radial loads, combined radial and axial loads, and significant misalignment in mechanical systems. This specific model features a steel/steel sliding contact surface combination, double-lip polyurethane contact seals on both sides, and lubrication holes with annular grooves in both rings for easy relubrication. The GEZ series is designed with a split outer ring for easier installation and maintenance.
Official Technical Specifications
Dimensions (Imperial & Metric)
| Parameter | Imperial Value | Metric Equivalent | Description |
|---|---|---|---|
| Bore diameter (d) | 1.5 in (1-1/2 in) | 38.1 mm | Inner diameter of the bearing |
| Outside diameter (D) | 2.4375 in (2-7/16 in) | 61.913 mm | Outer diameter of the bearing |
| Width, inner ring (B) | 1.3125 in (1-5/16 in) | 33.325 mm | Width dimension of the inner ring |
| Width, outer ring (C) | 1.0625 in (1-1/16 in) | 26.988 mm | Width dimension of the outer ring |
| Angle of tilt (α) | 6° | 6° | Maximum permissible misalignment angle |
| Raceway diameter inner ring | 1.850 in | 46.99 mm | Diameter of the inner ring raceway |
| Width annular lubrication groove (outer ring) | 0.146 in | 3.7 mm | Width of lubrication groove in outer ring |
| Width annular lubrication groove (inner ring) | 0.154 in | 3.9 mm | Width of lubrication groove in inner ring |
| Diameter lubrication hole (outer ring) | 0.098 in | 2.5 mm | Diameter of lubrication hole in outer ring |
| Chamfer dimension bore | min. 0.024 in | min. 0.6 mm | Minimum chamfer size on the bore |
| Chamfer dimension outer ring | min. 0.039 in | min. 1 mm | Minimum chamfer size on the outer ring |
Abutment Dimensions
| Parameter | Imperial Value | Metric Equivalent | Description |
|---|---|---|---|
| Abutment diameter shaft | min. 1.516 in / max. 1.567 in | min. 38.5 mm / max. 39.8 mm | Recommended shaft diameter for proper abutment |
| Abutment diameter housing | min. 1.909 in / max. 2.004 in | min. 48.5 mm / max. 50.9 mm | Recommended housing diameter for proper abutment |
| Fillet radius shaft | max. 0.024 in | max. 0.6 mm | Maximum allowable fillet radius on the shaft |
| Fillet radius housing | max. 0.039 in | max. 1 mm | Maximum allowable fillet radius in the housing |
Performance Data
| Parameter | Value | Description |
|---|---|---|
| Basic dynamic load rating | 125 kN (28,125 lbf) | Dynamic load capacity |
| Basic static load rating | 375 kN (84,375 lbf) | Static load capacity for permanent deformation calculation |
| Specific dynamic load factor | 100 N/mm² | Specific dynamic load capacity coefficient |
| Specific static load factor | 500 N/mm² | Specific static load capacity coefficient |
| Material constant | 330 | Material constant for life calculation in harsh conditions |
Material & Design Properties
| Property | Specification |
|---|---|
| Sliding contact surface | Steel/steel, standard finish with optimized tribological properties |
| Inner ring material | High-quality bearing steel |
| Outer ring material | High-quality bearing steel, split design |
| Maintenance requirement | Relubrication required |
| Radial internal clearance | CN (Normal clearance) |
| Sealing system | Double-lip polyurethane contact seals on both sides (suffix -2RS) |
| Product net weight | 0.42 kg |
Model Code Interpretation
- GEZ: Imperial radial spherical plain bearing with split outer ring designation
- 108: Size code (bore diameter 1.5 in)
- ES: Steel/steel sliding contact surface with standard lubrication holes and annular grooves in both rings
- 2RS: Double-lip polyurethane contact seals on both sides
Typical Applications
This bearing excels in applications requiring misalignment compensation with moderate to heavy loads, such as:
- Construction machinery articulation points
- Agricultural equipment linkages
- Industrial robot joints
- Material handling equipment
- Heavy-duty mechanical linkages
- Printing and paper processing machinery
- Automotive suspension systems
- Mining equipment components
