H7-30E1 Bore 678.942 Mm, Two Row Ball Slewing Rings With External Gears
The H7-30E1 Double-row four-point contact ball slewing bearings are widely used in Heavy-duty applications with extremely high load-bearing capacity requirements and limited installation space, such as large-scale construction machinery (large-tonnage cranes, excavators), wind power generation (main bearings), port machinery (quay cranes, stacker-reclaimers), mining machinery, tunnel boring machines, and large radar antennas, among other fields.
The H7-30E1 bearing is a Two Row Ball Slewing Rings with External Gears with an inner diameter of 678.942 mm , an outer diameter of 861.06 mm, a width of 82.042 mm. 50Mn or 42CrMo rings, chrome-alloy steel rolling mlement. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
H7-30E1 bearings ( 678.942 mm x 861.06 mm x 82.042 mm) have the advantages of high load-bearing capacity, good rigidity, stable structure, and strong impact resistance, and are therefore widely used in the Large excavators, tower cranes, and yaw bearings for wind power generation.
| Part Number | H7-30E1 |
| Bearing Type | Two Row Ball Slewing Rings with External Gears |
| Gears type | External Gear |
| Units | inch |
| Seal | Open |
| Rows NO. | Two |
| Outside - OD Φ [inch] | 33.90 |
| Inside - ID φ [inch] | 26.73 |
| IO [inch] | 31.38 |
| OI [inch] | 30.50 |
| OE [inch] | 32.80 |
| Overall Hight - HT [inch] | 3.23 |
| OH [inch] | 3.28 |
| IH [inch] | 3.07 |
| K [inch] | 0.95 |
| Mounting Holes - OBC [inch] | 31.50 |
| OU [inch] | 5/8-11 |
| No. Holes - OBC | 24 |
| Mounting Holes - IBC [inch] | 27.80 |
| IU [inch] | 5/8-11 |
| No. Holes - IBC | 24 |
| PD [inch] | 33.50 |
| DP [inch] | 4 |
| No. Of Teeth | 134 |
| F [inch] | 1.97 |
| Tooth Form 20˚ | STUB |
| Gear hardness (BHN) | 180-210 |
| Max. Tangential Tooth Load [lbs] | 4650 |
| Nominal Capacity Compressive Thrust [lbs] | 273000 |
| Nominal Capacity Moment [ft-lbs] | 160000 |
| Weight [lbs] | 230 |
The H7-30E1 Double-row four-point contact ball slewing bearings mainly consist of an inner ring, an outer ring, upper and lower rows of steel balls, spacers, and a sealing device. The two rows of steel balls make four-point contact within the raceway, and gears can be integrated into the inner and outer rings, resulting in a compact structural layout.
Double-row four-point contact ball slewing bearings utilize a double-row ball structure, significantly improving load-bearing capacity. They can simultaneously withstand axial loads, radial loads, and overturning moments, and offer superior rigidity compared to single-row structures. With a moderate overall height, they ensure stable and reliable installation, making them suitable for heavy-duty applications.
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