R8-42E3 Bore 975.106 Mm, Cross Roller Heavy Duty Slewing Rings With External Gears
The R8-42E3 Crossed roller slewing bearings are widely used in requiring high levels of rotational accuracy, rigidity, and load-bearing capacity, where installation space is often limited，such as industrial robots (joints, rotary seats), CNC machine tools (rotary tables, turrets), medical equipment (CT scanners, surgical robots), precision measuring instruments, radar turntables, and aerospace applications.
The R8-42E3 bearing is a Cross Roller Heavy Duty Slewing Rings With External Gears with an inner diameter of 975.106 mm , an outer diameter of 1225.296 mm, a width of 72.9996 mm. 50Mn or 42CrMo rings, chrome-alloy steel rolling mlement. Double Sealed type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
R8-42E3 bearings ( 975.106 mm x 1225.296 mm x 72.9996 mm) have the advantages of The rollers are arranged in a cross pattern, resulting in minimal deformation, low rotational runout, and precise positioning, and are therefore widely used in the Industrial robots, machine tool rotary tables, medical devices, radar antennas and precision rotating equipment.
| Part Number | R8-42E3 |
| Bearing Type | Cross Roller Heavy Duty Slewing Rings With External Gears |
| Gears type | External Gear |
| Units | inch |
| Seal | Double Sealed |
| Seal Material | NBR (Nitrile Butadiene Rubber) |
| Rows NO. | One |
| Outside - OD Φ [inch] | 48.240 |
| Inside - ID φ [inch] | 38.39 |
| IO [inch] | 42.323 |
| OI [inch] | 42.480 |
| Overall Hight - HT [inch] | 2.874 |
| OH [inch] | 2.520 |
| IH [inch] | 2.520 |
| Mounting Holes - OBC [inch] | 45.000 |
| OU [inch] | 0.69 |
| No. Holes - OBC | 36 |
| Mounting Holes - IBC [inch] | 39.875 |
| IU [inch] | 0.69 |
| No. Holes - IBC | 36 |
| PD [inch] | 47.600 |
| DP [inch] | 2.5 |
| No. Of Teeth | 119 |
| F [inch] | 2.520 |
| Tooth Form 20˚ | Stub |
| Gear hardness (BHN) | 250-300 |
| Max. Tangential Tooth Load [lbs] | 17800 |
| Nominal Capacity Compressive Thrust [lbs] | 526100 |
| Nominal Capacity Moment [ft-lbs] | 459100 |
| Weight [lbs] | 421 |
The R8-42E3 Crossed roller slewing bearings mainly consist of an inner ring, an outer ring, cross-arranged cylindrical rollers, spacers, and a sealing device. The rollers are arranged at 90° intervals within the raceway, enabling a single-row structure to withstand multi-directional loads.
The cross-arrangement of the rollers in crossed roller slewing bearings allows them to simultaneously withstand radial loads, axial loads, and overturning moments. They exhibit extremely high rigidity and a precision grade of P5 or higher. Their compact structure and easy installation significantly save installation space.
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