A16-78E4 Bore 1811.274 Mm, Heavy Duty Slewing Rings With External Gears (four-point Contact Ball)
The A16-78E4 Single-row four-point contact ball slewing bearings are widely used in rotational applications requiring the ability to withstand combined loads (axial force, radial force, and overturning moment) and demanding a compact structure and low self-weight, such as engineering machinery (truck cranes, excavators), wind power generation (yaw bearings), port machinery, photovoltaic tracking systems, robotics, and medical devices.
The A16-78E4 bearing is a Heavy Duty Slewing Rings with External Gears (four-point contact ball) with an inner diameter of 1811.274 mm , an outer diameter of 2204.72 mm, a width of 127 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.
A16-78E4 bearings ( 1811.274 mm x 2204.72 mm x 127 mm) have the advantages of Compact structure, lightweight, small footprint, high cost-performance ratio, and are therefore widely used in the Robots, construction machinery, wind turbines, radar antennas, and various rotary worktables.
| Part Number | A16-78E4 |
| Bearing Type | Heavy Duty Slewing Rings with External Gears (four-point contact ball) |
| Gears type | External Gear |
| Units | inch |
| Seal | Double Sealed |
| Seal Material | NBR (Nitrile Butadiene Rubber) |
| Rows NO. | One |
| Outside - OD Φ [inch] | 86.800 |
| Inside - ID φ [inch] | 71.31 |
| IO [inch] | 77.94 |
| OI [inch] | 77.85 |
| OE [inch] | 84.47 |
| Overall Hight - HT [inch] | 5.00 |
| OH [inch] | 4.50 |
| IH [inch] | 4.50 |
| Mounting Holes - OBC [inch] | 82.125 |
| OU [inch] | 1.31 |
| No. Holes - OBC | 48 |
| Mounting Holes - IBC [inch] | 73.688 |
| IU [inch] | 1.31 |
| No. Holes - IBC | 48 |
| PD [inch] | 86.000 |
| DP [inch] | 2 |
| No. Of Teeth | 172 |
| F [inch] | 4.00 |
| Tooth Form | 20d, Stub |
| Tangential Gear Capacity [lbs] | 36500 |
| Nominal Capacity Compressive Thrust [lbs] | 1670000 |
| Nominal Capacity Raceway Moment [ft-lbs] | 2480000 |
| Weight [lbs] | 2033 |
The A16-78E4 Single-row four-point contact ball slewing bearings mainly consist of an inner ring, an outer ring, steel balls, spacers, and a sealing device. The raceways are peach-shaped or arc-shaped, and the steel balls form four-point contact with the inner and outer ring raceways. Gears can be integrated into the inner and outer rings.
Single-row four-point contact ball slewing bearings feature a low axial height and light weight due to their single-row structure. One bearing can simultaneously withstand axial loads, radial loads, and overturning moments. The four-point contact design provides high load-bearing capacity, good rigidity, and easy installation and maintenance.
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