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023.25.560 Slewing Bearing

Internal Gear Double-Row Step Bore Ball Slewing Bearing | 446x676x106mm

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023.25.560 Technical Specifications

Bearing Type Double-Row Step Bore Ball Slewing Bearings
Gear Type Internal gear type
d (ID) 446mm
D (OD) 676mm
B (Width) 106mm
Dynamic Load (Cr)
Static Load (Cor) 1340kN
Mass 115Kg
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 640 mm
D2 480 mm
dn1 dn2 18
dm1 dm2 M16
L 32 mm
n 20 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 417 mm Tooth tip diameter of internal gear ring
z 84 Number of teeth of internal gear

Product Description

023.25.560 is a double-row step bore ball slewing bearing with internal 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 560mm raceway center circle diameter. This model is driven by a pinion inside the bearing ring. It measures 446mm inner diameter, 676mm 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, Internal gear for compact drive, Step bore bolt holes (countersunk design)

Applications

Rotary tables, Wind turbine yaw drives, Industrial turntables, Medical imaging equipment, Packaging machinery

What is the advantage of double-row step bore ball bearing over single-row?

Unlike single-row four-point contact ball bearings that combine loads in one raceway, 023.25.560 uses two independent rows of balls – one for axial loads and one for radial loads. This provides approximately 30-50% higher load capacity. The step bore design also allows for countersunk mounting bolts, reducing installation height.

What applications is 023.25.560 best suited for?

Double-row step bore ball bearings are ideal for medium-heavy applications requiring higher capacity than single-row designs but with lower profile than three-row roller bearings. 023.25.560 is commonly used in tower cranes, medium excavators, aerial work platforms, wind turbine yaw drives, and industrial rotary tables.

How to understand the series code of 023.25.560?

Series codes for double-row step bore bearings: 020 (gearless), 021 (external gear), 022 (external gear alternative), 023 (internal gear), 024 (internal gear alternative). The number after series indicates ball diameter (e.g., 25 = 25mm balls), and the last number is PCD (raceway center circle diameter). For example, 023.25.500 means internal gear, 25mm balls, 500mm PCD.

What customization options are available for 023.25.560?

We provide OEM customization including gear type (external/internal/gearless), step bore mounting hole pattern (quantity, diameter, depth), seal arrangement (standard/heavy-duty), ball material and heat treatment, and surface protection (zinc plating, phosphate, painting).

How can I get a quotation for 023.25.560?

Please provide model number, quantity, gear type required (external/internal/gearless), mounting hole specifications, and application details (load, speed, environment). We will respond with a factory-direct quotation within 24 hours.

What is the lead time for 023.25.560 double-row bearings?

Standard sizes (PCD under 2000mm): 10-20 days. Larger sizes (2000-4500mm): 25-35 days. Custom orders (special mounting holes, non-standard gear): 35-50 days depending on complexity.

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

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