KD 210 slewing bearing

KD 210 Slewing Bearing Series | Light-Weight Four-Point Contact Design for Space-Constrained Industrial Applications

Luoyang Heng Guan Bearing Technology Co., Ltd. delivers the KD 210 Slewing Bearing — a light-weight, single-row four-point contact ball series designed specifically for applications where space and weight are critical constraints. Manufactured in Luoyang, China's renowned bearing industry hub, our ISO 9001-certified facility leverages over 30 years of engineering expertise and advanced CNC production capabilities. The product features a compact flanged profile that reduces weight by up to 30% compared to conventional designs, while handling combined axial, radial, and tilting moment loads. Available in diameters from 414 mm to 1,094 mm with multiple gear configurations, each unit undergoes 100% dimensional inspection and raceway hardness testing before shipment to over 50 countries worldwide.

What Makes KD 210 Series Stand Out?

Compact Flanged Profile Design

The KD 210 series adopts a profiled flanged ring structure that minimizes material usage without compromising load capacity. Compared to traditional rectangular-section slewing rings, this flanged design reduces overall weight by approximately 30%. You'll find it ideal for packaging machine turntable bearing installations and automated conveying systems where mounting space is limited. The reduced mass also simplifies installation procedures and lowers transportation costs.

Four-Point Contact Ball Raceway

Each bearing features a single-row four-point contact ball raceway with induction-hardened surfaces (HRC 55-62). This configuration enables your equipment to handle axial loads, radial loads, and tilting moments simultaneously within a single compact assembly. You won't need separate thrust and radial bearings — the KD 210 slewing bearing does it all. The precision-hardened raceways ensure extended service life even under continuous rotation and variable loading conditions.

Multiple Gear Configurations

Choose from two structural profiles, each with tailored gear configurations:

• Type 13 Flanged Profile — A compact, light-weight design with profiled flanged rings. Available without gear only, ideal for externally driven systems or free-rotation applications. Overall height: 40 mm.

 • Type 21 Standard Profile — A versatile rectangular-section design supporting all three drive modes:

Without gear (230.20) — For externally driven or free-rotation setups

External gear (231.20) — Outer ring teeth for pinion-driven rotation

Internal gear (232.20)  Inner ring teeth for compact internal drive integration Overall height: 56 mm.

Each configuration is available with standard bolt hole patterns (.013 suffix) or double bolt hole patterns (.503 suffix) for enhanced fastening rigidity.

Certified Material & Precision Manufacturing

All units are manufactured from forged 42CrMo or 50Mn alloy steel through CNC turning, precision gear hobbing, and controlled induction hardening. Our facility houses CNC vertical lathes, CNC quenching machines, CNC gear shapers, and large gear hobbing equipment. Every material handling slewing bearing KD 210 undergoes rigorous dimensional inspection, raceway hardness testing, and rotational torque verification. We provide material certificates and inspection reports with every order.

Technical Specifications

Without Gear (Type 13)

Without Gear (Type 21, Standard Bolt Holes)

External Gear (Type 21, Standard Bolt Holes)

Internal Gear (Type 21, Standard Bolt Holes)

Note: Double bolt hole (.503) variants available upon request.

Where KD 210 Delivers Real Value?

Mining & Material Handling

The slewing bearing for mining equipment KD 210 is deployed in mining conveyors, stacker-reclaimers, and bucket-wheel excavator turntables. The four-point contact ball design handles combined axial, radial, and overturning loads typical of bulk material handling operations. The flanged structure simplifies mounting onto large rotating platforms, while sealed raceways protect against dust and abrasive particle ingress in harsh mining environments.

Offshore & Marine Engineering

In offshore crane pedestals, deck equipment, and ship-mounted davits, the offshore crane slewing ring KD 210 provides reliable performance under corrosive marine conditions. Available with zinc spraying and heavy-duty sealing, these bearings maintain smooth rotation and structural integrity even under salt spray exposure. The compact flanged profile helps reduce topside weight — a critical factor in offshore platform design.

Automated Conveying & Packaging Excavator

For rotary indexing tables, bottling lines, and automated production line slewing bearing installations, the KD 210 series offers low rotational torque and high positional accuracy. The light-weight flanged design integrates easily into compact machine frames, while the four-point contact raceway handles eccentric loads from off-center product placement. Without-gear configurations allow direct coupling to servo motors or external drive mechanisms.

General Mechanical Engineering

KD 210 slewing rings serve rotating work platforms, welding positioners, carousel slewing ring bearing systems, and solar tracker azimuth drives. The standardized bolt hole patterns and interchangeable mounting dimensions simplify retrofitting into existing equipment, while the broad size range covers the most common industrial turntable requirements.

FAQ

Q: What's the difference between Type 13 and Type 21 KD 210 slewing rings?

A: Type 13 is a flanged profile bearing supplied without gear, designed for externally driven applications with a lower overall height (40 mm). Type 21 is a standard profile bearing available in without-gear, external-gear, and internal-gear configurations, with an overall height of 56 mm and higher load capacity.

Q: Can I replace my existing bearing with a KD 210 model?

A: Yes. The KD 210 series follows industry-standard mounting dimensions. Both standard (.013) and double (.503) bolt hole patterns are available. Simply provide your existing bearing drawing or model code, and we'll match the bolt pattern.

Q: What's the typical lead time?

A: Standard catalogue sizes ship within 15-30 days. Custom configurations (special seals, surface treatments, modified bolt patterns) require 30-45 days. Rush orders can be accommodated — specify your required delivery date when inquiring.

Q: What sealing options are available for harsh environments?

A: Standard configuration includes double-lip nitrile rubber seals. For heavy dust environments (mining, cement plants), we can add labyrinth seals. For marine and offshore applications, we recommend fluoroelastomer (FKM) seals with enhanced corrosion protection.

Q: Do you provide installation guidance?

A: Yes. Each order includes static load curve charts, bolt tightening torque specifications, and an installation & maintenance manual. CAD drawings (DWG/STEP format) are available for design integration and FEA verification.

Q: What if I don't have original drawings for my old bearing?

A: We offer on-site measurement and reverse engineering services. Our technical team can visit your facility, measure the existing bearing, and manufacture an exact replacement — even without original drawings. This service is particularly valuable for discontinued models and imported equipment.

Contact Us

For the KD 210 slewing bearing, tell us your model code, gear type, and quantity. Receive a detailed quotation with lead time within 24 hours. Custom surface treatments, sealing options, and bolt hole modifications are available.

Contact our engineering team: mia@hgb-bearing.com