Slewing Bearing Ring – Component Specifications and Selection Guide

Product Specifications

Technical details and manufacturing context for Slewing Bearing (Ring)

Definition

The slewing bearing ring is a critical structural component of a slewing bearing, forming the inner or outer raceway that guides and supports the rolling elements (balls or rollers). It is designed to withstand high axial, radial, and moment loads while enabling smooth rotational motion between connected structures in heavy machinery. The ring is typically manufactured from alloy steel such as 42CrMo4 or 50Mn, with induction-hardened raceways to achieve a hardness of 55–62 HRC (per ISO 6508) for wear resistance. The ring's geometry is defined by its outer diameter (200–5000 mm), inner diameter (100–4500 mm), and height (50–300 mm), which determine the mounting interface and load capacity. The dynamic load rating (50–2000 kN, per ISO 76) indicates the bearing's capacity for rotating applications, while the static load rating (100–5000 kN, per ISO 76) must exceed peak static loads. The tilting moment capacity (10–500 kN·m) is critical for applications involving moment loading. Rotational speed (0.5–10 rpm) and operating temperature (-40 to 85 °C) affect lubrication and seal life. Radial and axial runout tolerances (0.05–0.20 mm and 0.05–0.15 mm, per ISO 1101) are specified for precision applications. The ring's weight (50–2000 kg) affects handling and structural support. These values are directory reference ranges; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application.

Working Principle

The ring provides a hardened, precision-machined raceway. When integrated with rolling elements and a mating ring, it forms a low-friction bearing interface. Loads are transferred from the connected structure through the ring, distributed across the rolling elements, and transmitted to the opposing ring and its mounting structure. The raceway's hardness and surface finish minimize wear and friction, enabling smooth rotation under heavy loads.

Common Materials

Alloy Steel (e.g., 42CrMo4, 50Mn)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Outer Diameter	200–5000 mm	Determines mounting interface and load capacity.
Inner Diameter	100–4500 mm	Must match shaft or housing dimensions.
Height	50–300 mm	Affects axial stiffness and weight.
Dynamic Load Rating	50–2000 kN	Higher values for longer fatigue life.ISO 76
Static Load Rating	100–5000 kN	Must exceed peak static loads.ISO 76
Tilting Moment Capacity	10–500 kN·m	Critical for moment loading applications.
Rotational Speed	0.5–10 rpm	Higher speeds require special lubrication.
Operating Temperature	-40–85 °C	Outside range may affect seal and grease life.
Radial Runout	0.05–0.20 mm	Tighter tolerance for precision applications.ISO 1101
Axial Runout	0.05–0.15 mm	Affects smoothness of rotation.ISO 1101
Hardness	55–62 HRC	Induction hardened raceway for wear resistance.ISO 6508
Weight	50–2000 kg	Affects handling and structural support.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Raceway Part
Precision-machined groove or track that guides and supports the rolling elements (balls or rollers).

Material: Hardened Alloy Steel
Gear Teeth (if applicable) Optional Part
Integrated internal or external gear teeth for direct drive engagement in motorized slewing systems.

Material: Hardened Alloy Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slewing Bearing (Ring).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Slewing Bearing & Drive

View system integration details

Manufacturers of Slewing Bearing (Ring)

Manufacturer profiles associated with Slewing Bearing (Ring).

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Frequently Asked Questions

What materials are used for slewing bearing rings?

According to the directory, alloy steel grades such as 42CrMo4 and 50Mn are commonly used. These materials provide the strength and hardness needed for heavy-duty applications.

How do I select the correct ring size?

The outer diameter, inner diameter, and height must match the mounting interface and load requirements. Refer to the directory ranges (e.g., outer diameter 200–5000 mm) and confirm with the manufacturer for your specific application.

What standards apply to slewing bearing rings?

The directory lists ISO 76 for load ratings, ISO 1101 for runout tolerances, and ISO 6508 for hardness. These standards serve as verification references; actual compliance must be confirmed with the supplier.

What maintenance signals indicate ring wear?

Increased noise, vibration, or rotational resistance may indicate raceway wear or damage. Regular inspection of runout and hardness can help detect issues early. Always follow the manufacturer's maintenance guidelines.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Max contact pressure: 4000-6000 MPa (depending on material and heat treatment)
other spec:	Max rotational speed: 50-100 rpm (depending on size and lubrication), Load capacity: Static 100-5000 kN, Dynamic 50-2500 kN
temperature:	-40°C to +120°C (standard), up to +200°C with special materials

Slewing Bearing (Ring)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards