KD 600 slewing bearing

KD 600 Slewing Bearing – High-Capacity Upgrade for Mobile Equipment and Industrial Turntables

The KD 600 Slewing Bearing is a single-row four-point contact ball slewing ring engineered for equipment requiring 30–50% higher load capacity without expanding the mounting envelope. Available in 79 configurations across three gear options (without gear, external gear, internal gear), this series spans dimensional ranges from DL 370–2,645 mm, height 55–109 mm, and weight 29–1,142 kg. By increasing ball diameters from standard 20 mm to 25/30/35/40/45/50 mm within the same ball track diameter class and optimizing raceway contact geometry, the product delivers significantly elevated static load ratings and extended fatigue life under cyclic loading—enabling direct bolt-in replacement for standard bearings that have reached their capacity limits.

Configuration & Model Range

The KD 600 series is manufactured in three gearing configurations to match diverse drive integration requirements:

Note:

· Equivalent Interchange Type refers to Type 621 structure, dimensionally compatible with KD 210 Type 21 mounting interfaces (bolt circle diameter, hole distribution) for direct replacement without modifications.

· LC (Limited Clearance) features reduced internal clearance between inner and outer rings, suitable for applications demanding higher rotational precision.

Five Core Performance Advantages

Higher Load Capacity, Same Envelope

The defining advantage of this series over standard single-row slewing rings is its elevated load capacity within a comparable dimensional footprint. By increasing ball diameter—for example, from standard 20 mm to 25 mm or 30 mm in the same ball track diameter class—and optimizing raceway contact geometry, the KD 600 delivers 30–50% higher static load ratings and significantly extended fatigue life under cyclic loading. This allows your equipment designers to solve overload issues without increasing bearing outer diameter, eliminating costly frame or housing modifications.

Each raceway is precision-ground after induction hardening to maintain consistent four-point contact angles across full 360-degree rotation, ensuring uniform load distribution even under maximum rated tilting moment conditions.

All Three Gear Configurations

Unlike some heavier-duty slewing ring series that only offer geared variants, the KD 600 is available in all three configurations:

· Without gear (060 prefix): For externally driven or free-rotation applications. Eliminating gear teeth reduces weight and cost while allowing flexible drive integration via belt, chain, or remote-mounted pinion. Common in robotic bases, rotary worktables, and conveyor turntables with independent drive motors.

· External gear (061 prefix): Teeth precision-hobbed on the outer ring for standard pinion-driven slewing drives. The most widely adopted configuration for mobile cranes, excavators, and general rotating excavator. Standard motor-gearbox-pinion drive packages are widely available.

· Internal gear (062 prefix): Teeth cut on the inner ring for compact drive integration. Preferred when the outer ring must remain clear for attachments or operator stations, or when the drive mechanism is best housed within the bearing bore. Common in compact excavators, aerial platforms, and specialized positioning systems.

Graduated Ball Diameters for Precise Sizing

KD 600 bearings are manufactured in seven ball diameter classes, each delivering a distinct load capacity tier for specific equipment classes:

· 20–22 mm balls: Light to medium-duty mobile equipment, robotic arm base rotation, packing excavator turntables, and automated indexing tables. DL 370–710 mm, weight 29–68 kg.

· 25–30 mm balls: Mobile cranes, mid-size excavators, wind turbine yaw systems, and material handlers. DL 475–1,500 mm, weight 50–338 kg.

· 35–40 mm balls: Heavy industrial turntables, large mobile cranes, steel mill equipment, and large-scale rotary worktables. DL 680–1,800 mm, weight 131–531 kg.

· 45–50 mm balls: Ultra-heavy rotating platforms, specialized heavy excavator, and large-capacity industrial carousels. DL 805–2,645 mm, weight 215–1,142 kg.

This graduated sizing prevents costly oversizing while ensuring adequate fatigue life for your intended duty cycle and operating conditions.

Direct Interchangeability

KD 600 series bearings are manufactured to widely adopted dimensional standards for single-row four-point contact slewing rings. Bolt circle diameters, overall heights, ring cross-sections, and gear data conform to industry specifications, enabling direct replacement of existing bearings. For upgrade projects where a standard bearing requires replacement with a higher-capacity unit, the KD 600 slewing bearing can often be fitted within the same mounting interface—Contact Us with your existing bearing drawing for compatibility assessment before ordering.

Certified Materials & Precision Manufacturing

· Forged 42CrMo or 50Mn alloy steel rings—quenched and tempered for optimal core toughness and fatigue resistance

· Induction-hardened raceways to HRC 55–62—hardened depth profile verified by ultrasonic testing

· CNC gear hobbing (external gear) or CNC gear shaping (internal gear) to DIN 3967 / ISO 1328 quality standards

· 100% CMM dimensional inspection on critical geometry: ball track diameter, bolt circles, overall height, and gear pitch circle

· Raceway hardness mapping and rotational torque verification on every unit before shipment

· Material certificates with full heat number traceability provided with every order as standard

Application Coverage

Mobile Crane Slewing Bearing KD 600

Mobile crane upper structure rotation demands slewing bearings that combine high tilting moment capacity with fatigue resistance under cyclic loading of repetitive lift-and-slew operations. The external gear configuration (061 prefix) is standard for mobile crane slewing drives, with the pinion driven through a planetary gearbox by a hydraulic or electric slewing motor. KD 600 bearings in the 560–1,500 mm DL range cover mobile crane classes from 25-ton city cranes to 130-ton all-terrain models. Bolt circle and overall height dimensions match factory-original mounting interfaces for direct bolt-in replacement.

Excavator Slewing Ring High Capacity

When a standard excavator slewing ring shows premature wear or reaches its fatigue limit in demanding applications—such as rock breaking, heavy demolition, or deep excavation—the KD 600 provides a direct bolt-in upgrade with 30–50% higher load capacity at the same mounting interface. The external gear variant (061.25.xxxx) integrates with the existing hydraulic swing motor and pinion drive. Critical mounting dimensions—bolt circle diameters, overall height, and gear module—are maintained for direct replacement without adapter plates, frame modifications, or hydraulic system recalibration.

Wind Turbine Yaw Slewing Bearing

Wind turbine yaw bearings must withstand continuous low-speed oscillation as the nacelle aligns with changing wind direction, combined with high static loads from the rotor and nacelle assembly. External gear configurations (061 prefix) engage multiple pinion drives arranged around the outer ring, distributing drive torque across several engagement points for redundancy and reduced individual tooth loading. This multi-pinion arrangement also provides inherent anti-clearance capability, critical for maintaining precise nacelle alignment in gusty wind conditions. Internal gear variants are available for compact nacelle designs where the yaw drive assembly is integrated within the tower-top interface.

Heavy Duty Turntable Bearing Industrial

Large-diameter industrial turntables—including ladle turrets in steel mills, heavy welding positioners, large rotary worktables, and material handling carousels—demand slewing rings at the upper end of the KD 600 capacity spectrum. The 40–50 mm ball diameter classes deliver extreme load ratings required for these applications. For steel mill ladle turrets, high-temperature grease specifications and enhanced sealing against scale and refractory dust are standard. Internal gear configurations are frequently specified to house the drive mechanism within the turret column, protected from radiant heat and airborne debris.

Robotic Arm Slewing Bearing 060, Packing Machine Turntable Bearing, Forest Excavator Slewing Ring

At the smaller end of the range, bearings in the 370–560 mm DL class—with 20–22 mm ball diameters—serve robotic arm slewing bearing 060, packing machine turntable bearing, forest excavator slewing ring, and precision indexing tables. Without-gear configurations (060 prefix) are common, where the bearing provides smooth, low-torque support and rotation is driven by a separate servo motor with direct or belt-coupled drive. The compact cross-section and light weight help minimize overall mass, reducing motor sizing requirements and improving system payload-to-weight ratio.

Certification

FAQ

Q: Can the KD 600 replace my existing KD 210 bearing?

A: Yes. The Equivalent Interchange Type models use Type 621 structure with identical mounting dimensions to KD 210 Type 21, allowing direct replacement without modifications.

Q: What is the typical lead time?

A: In-stock products ship within 7–15 days. Custom setups take 4–6 weeks, depending on intricacy.

Q: Which gear configuration should I choose?

A: Select 060 (without gear) for external drive systems, 061 (external gear) for standard pinion drives, or 062 (internal gear) for compact drive integration inside the bore.

Q: Do you provide material certificates?

A: Yes. Full heat traceability and material certificates are provided with every order as standard.

Contact Us

Need technical assistance selecting the right KD 600 slewing bearing for your application? Send your existing bearing drawing or equipment specifications to mia@hgb-bearing.com for a compatibility assessment, detailed quotation, and delivery timeline confirmation.