021.25.710 Technical Specifications
| Bearing Type | Double-Row Step Bore Ball Slewing Bearings |
|---|---|
| Gear Type | External gear type |
| d (ID) | 594mm |
| D (OD) | 826mm |
| B (Width) | 106mm |
| Dynamic Load (Cr) | |
| Static Load (Cor) | 1730kN |
| Mass | 140Kg |
| Material | 42CrMo or 50Mn forged raceway, hardened; GCr15 steel balls (double rows) |
| Cage | Segmented brass or steel cage (double-row design) |
| Clearance | C3 standard clearance (C4 optional for high vibration) |
| Precision | P0 standard precision |
Bolt Hole Diameter
| D1 | 790 mm |
|---|---|
| D2 | 630 mm |
| dn1 dn2 | 18 |
| dm1 dm2 | M16 |
| L | 32 mm |
| n | 24 mm |
Structure dimensions
| n1 | 4 mm |
|---|---|
| D1 | mm |
| d1 | mm |
| H1 | 96 mm |
| h | 26 mm |
Gear
| b | 60 mm | Tooth width |
|---|---|---|
| m | 60 | Module |
| da | 862.8 mm | Tooth tip diameter of external gear ring |
| z | 141 | Number of teeth of external gear |
Product Description
021.25.710 is a double-row step bore ball slewing bearing with external gear. It features two independent rows of steel balls arranged in a stepped raceway configuration, providing higher load capacity than single-row four-point contact ball bearings. The step bore design allows for countersunk mounting bolts. It is fitted with 25mm diameter steel balls and has 710mm raceway center circle diameter. This model is driven by a pinion meshing with the external teeth. It measures 594mm inner diameter, 826mm outer diameter, and 106mm height. With excellent load distribution and compact design, it is widely used in medium-heavy applications such as tower cranes, excavators, and industrial machinery requiring higher capacity than single-row designs.
Key Features
Double-row ball design, Step bore for countersunk mounting, Higher load capacity than single-row, Two independent ball raceways, P0 precision standard, C3 internal clearance, Segmented brass or steel cage, External gear for pinion drive, Step bore bolt holes (countersunk design)
Applications
Tower cranes, Excavators (medium-large), Aerial work platforms, Concrete pumps, Mobile cranes
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Delivery & Service
Delivery Time
In-stock items: 3–5 working days; Bulk orders: 7–15 working days.
Shipping
Ocean Freight / Land Transport
Warranty
12-month warranty, extendable to 18 months.
Loading Port
Dalian Port or other nominated port
Packing
Export packing: tube + box + carton + wooden case
Order
Mixed models & small orders welcome
Image for reference only.
