020.30.900 Slewing Bearing

1. Model Specification (JB/T 2300-2011 Standard): 02 Series (double-row unequal-diameter ball type) · Gearless · Steel ball diameter: 30mm · Raceway center diameter: 900mm · Outer diameter: 1042mm.
2. The 02 Series features a three-race, double-row unequal-diameter ball structure; the double-row design distributes axial, radial, and tilting moment loads independently between the upper and lower rows of steel balls, resulting in a load-bearing capacity increase of approximately 40–60% and enhanced rigidity.
3. The "020" model is the standard gearless version; other models within the same diameter range include the 021 (external gear), 022 (external gear variant), 023 (internal gear), and 024 (internal gear variant). With a raceway center diameter of 900mm (outer diameter of approx. 1m), it is designed for applications such as 10–25 ton class excavators, small crawler cranes, tower crane slewing mechanisms, and industrial turntables.

Product Description

020.30.900 Slewing Bearing – Double Row Ball Type for Compact Excavators & Industrial Turntables

Luoyang Heng Guan Bearing Technology Co.,Ltd., backed by over 30 years of expertise in Slewing Bearing design, delivers the 020.30.900 Slewing Bearing — a double-row, different-diameter ball slewing bearing with three-ring construction. This compact rotating platform bearing 900mm features 1042mm OD × 758mm ID × 124mm height, offering 2,580 kN axial static capacity and 40-60% higher load-carrying capability than single-row designs. ISO9001-certified and fully interchangeable with SNR30/900, it serves 10-25 ton excavators, tower cranes, and aerial work platforms. Our advanced CNC equipment produces slewing bearings from 50-10,000mm diameter across precision grades P0–P4, exported to 50+ countries including Germany, the United States, and Australia.

Product Overview

The product belongs to the 02 Series — a toothless, double-row ball slewing bearing optimized for mid-range construction equipment and industrial turntables. Its three-ring structure (inner ring + outer ring + spacer) houses two rows of different-diameter steel balls in separate raceways. This design decouples axial, radial, and tilting moment loads, distributing forces independently across the upper and lower ball rows. The result? 40-60% greater load capacity compared to single-row four-point contact bearings of the same size.

The 900mm raceway center diameter positions this small excavator slewing bearing 900mm perfectly for 10-25 ton mini excavators, compact crawler crane slewing bearing units, and truck crane turntable bearing 1m applications. With 50Mn forged steel rings and double-lip seals, it delivers durability in dusty, high-impact environments like forestry excavator and construction sites.

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Technical Specifications

Basic Dimensions

Parameter	Symbol	Value
Outer Diameter	Da	1042 mm
Inner Diameter	Di	758 mm
Height	H	124 mm
Raceway Center Diameter	DL	900 mm
Ball Diameter	Dw	30 mm
Weight	—	≈250 kg

Mounting Dimensions

Parameter	Symbol	Value
Bolt Circle Diameter (Outer)	D₁	998 mm
Bolt Circle Diameter (Inner)	D₂	802 mm
Number of Holes (Outer)	n	30
Number of Holes (Inner)	n₁	22
Bolt Size	—	M20

Material & Construction

Feature	Specification
Ring Material	50Mn / 42CrMo
Manufacturing	Three-ring integral forgings
Sealing Type	Double-lip seal

Double Row vs Single Row: Why You Should Choose 020.30.900

40-60% Higher Load Capacity

Two independent ball rows handle axial, radial, and tilting moment forces on separate raceways. This load segregation eliminates the performance compromises inherent in single-row four-point contact designs.

Superior Rigidity

The three-ring structure (inner ring + outer ring + spacer ring) creates a stiffer bearing assembly than single-row equivalents at the same diameter, reducing deflection under load.

Different-Diameter Ball Optimization

Upper and lower rows use different ball sizes to optimize load distribution across varying force vectors, minimizing localized stress concentrations and extending fatigue life.

Application Fit

Choose double-row when your equipment faces:

· High axial loads + large tilting moments + frequent start-stop cycles → excavators, cranes, aerial platforms

· Pure rotational motion with light loads → display turntables, positioning stages (single-row sufficient)

Load Capacity

Parameter	Symbol	Value
Axial Static Load	C₀ₐ	≈2,580 kN
Radial Static Load	C₀ᵣ	Contact for specifications
Tilting Moment	Mₜ	Contact for specifications
Maximum Speed	nₘₐₓ	Contact for specifications

Gear Options – Upgrade Without Redesign

Gear Option	Model	Module	Tip Circle (mm)	Teeth
External Gear	021.30.900	m=8	≈1088	Z≈90
External Gear (alt)	021.30.900	m=10	≈1090	Z≈72
Internal Gear	023.30.900	m=8/10	≈712/710	—

Key advantage: The same 900mm base design accepts external or internal gears without modifying your mounting interface, simplifying future upgrades.

Applications

10-25 Ton Excavators

The product is the mainstream choice for mini excavator slew ring bearing assemblies in mid-size excavators. Its double-row design provides the high tilting moment capacity required for digging operations.

Tower Cranes

Used in upper carriage rotation for tower crane slewing ring 900mm systems, the three-ring structure delivers smooth rotation and anti-wind load rigidity critical for safe crane operation.

Aerial Work Platforms

Perfect for telescopic boom turntables, this aerial work platform slewing ring double row fits compact 1m-diameter platforms on mid-range aerial lifts.

Forestry Excavator

Harvester heads and feller bunchers demand shock resistance — the double-row configuration absorbs impact loads better than single-row alternatives.

Solar Trackers

Emerging solar tracking systems benefit from reliable industrial turntable bearing double row performance in high-cycle, low-maintenance applications.

Industrial Turntables

Welding positioners, assembly line rotary platforms, and automated workstations rely on this bearing's precision and rigidity.

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SNR30/900 Interchange Compatibility

The 020.30.900 Slewing Bearing is fully interchangeable with SNR30/900. Verified dimensions include:

· Da: 1042 mm

· Di: 758 mm

· H: 124 mm

· D₁: 998 mm

· D₂: 802 mm

No redesign of your mounting interface is required for direct replacement.

OEM & Custom Manufacturing

We specialize in on-site measurement and reverse engineering for obsolete or undocumented equipment. Our team can:

· Conduct field surveys with precision instruments

· Perform wear analysis and failure diagnostics

· Optimize designs for enhanced durability

· Deliver custom solutions without original drawings

Our CNC vertical lathes, quenching machines, and gear hobbing equipment handle diameters from 50mm to 10,000mm.

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FAQ

Q: Can I upgrade to a geared version later?

A: Yes. Models 021.30.900 (external) and 023.30.900 (internal) share identical mounting dimensions.

Q: What's the typical lead time?

A: Standard non-gear models ship within 3-4 weeks; custom gear configurations require 5-6 weeks.

Q: Do you provide installation support?

A: Absolutely. We offer technical consultation, CAD drawings, and on-site installation guidance.

Q: How does sealing perform in dusty environments?

A: Our double-lip seal design prevents dust and moisture ingress, ideal for construction and mining applications.

Contact Us

Ready to upgrade your equipment with the 020.30.900 Slewing Bearing? Contact our engineering team for CAD drawings, load calculations, and competitive OEM quotations.

Email: mia@hgb-bearing.com

WHAT OUR CUSTOMERS SAY

Here is the customer's evaluation of us

From Europe

As a leading construction machinery manufacturer in Europe, we are very impressed with the quality and performance of your slewing rings. The precision machining and consistent quality meet our strict standards. A reliable global supplier!

From United States

Our CT scanners require extremely smooth rotation, low noise, and no magnetic interference. Your product perfectly meets these requirements, operating virtually silently without compromising image quality. Your technical expertise is truly impressive!

From Southeast Asia

We have been the distributor of your brand for many years and have received excellent customer feedback. Your diverse product line meets diverse customer needs, and our consistent quality makes us very competitive in the market. Your technical support and service team are also fantastic!

From United States

The slewing bearing selected for our wind turbine main drive system has exceeded our expectations in terms of precision and reliability. It operates smoothly even in extreme wind conditions and has a long maintenance cycle, significantly reducing our lifecycle costs. We are a trustworthy partner!

From the Middle East

Our equipment required a slewing bearing with non-standard dimensions and special gears. We contacted several companies but they all said they couldn't make it. Not only did you accept the order, but we also communicated smoothly throughout the entire process from proofing to mass production, and the finished product fully met our design requirements. This customization capability demonstrates your true technical strength.

From Europe

We have integrated your slewing rings into our new line of crawler cranes. The performance under full load and in extreme weather conditions has been flawless. The precision and durability meet the highest European standards. A truly reliable component for critical applications.

From North America

The harsh, sandy environment of our port is a true test for any equipment. Your slewing bearings' superior sealing system has effectively kept out abrasive contaminants. Our ship-to-shore cranes have seen a dramatic increase in uptime and service life since switching to your brand.

From the Middle East

In the mining industry, equipment failure is not an option. The immense strength and robust construction of your large-diameter slewing bearings have withstood the incredible shocks and loads in our mining excavators. Their reliability is directly contributing to our productivity.