VLU200644 Slewing Bearings

VLU200644 Slewing Bearings — Flanged Light Series Four-Point Contact Ball Bearing

VLU200644 Slewing Bearings are flanged, gearless, single-row four-point contact ball slewing rings in the INA light series 20, designed for compact rotary applications where weight and mounting simplicity matter. With a 644 mm raceway diameter, 534 mm bore, 748 mm outside diameter, and 56 mm height, the ring weighs 36.4 kg. The outer flange allows direct bolt mounting without a machined counterbore, and the four-point ball design handles combined axial, radial, and tilting moment loads in a single row.

Luoyang Heng Guan Bearing Technology Co., Ltd. is based in Luoyang, China, with more than 20 years of experience in bearing manufacturing. The factory holds ISO 9001 certification, and all products are RoHS compliant.

Product Specifications

The table below lists all key dimensions, mounting data, and load ratings for the VLU 200644.

Design Features

Four-Point Contact Ball Design

A single ball row contacts four raceway points simultaneously, which means axial, radial, and tilting moment loads are all handled within one compact row. This reduces the axial envelope compared to multi-row designs and suits applications where installation space is limited.

Flanged Outer Ring

The 12 mm outer flange with T/t 12/12 mm centering lands allows the ring to bolt directly onto a flat mounting face. No counterbore or separate locating ring is required, which reduces the machining work on the mating structure.

Light Series Construction

At 36.4 kg, this unit is lighter than the standard-series VSU 644 (44.4 kg). The Standard_VL clearance — radial 0–0.5 mm, axial tilting 0–0.7 mm — is wider than the standard series, which suits low-load, free-running rotation rather than high-stiffness positioning.

Materials and Surface Treatment

Ring material options are 50Mn (standard) and 42CrMo4 (higher toughness). Raceways undergo induction hardening to 55–62 HRC while the core remains ductile. GCr15 balls are used throughout. Double-lip NBR seals retain grease and limit contamination ingress.

Gearless Drive Configurations

The VLU200644 Slewing Bearings carries no gear teeth on the ring itself. External drive methods commonly used with this bearing include:

· External pinion drive — used on indexing tables and packaging carousels

· Chain or belt drive — used on conveyors and food processing lines

· Friction wheel drive — used on light material handling equipment

· Direct motor or hydraulic motor via gearbox — used on solar trackers and robotic bases

The absence of gear teeth keeps unit cost lower and order lead time shorter compared to geared slewing ring variants.

Application Areas

Solar Trackers

The flanged outer ring mounts directly onto tracker frames. This configuration is common for mid-size single-axis solar trackers using an external worm drive, where the flange eliminates the need for a counterbore in the frame.

Filling and Packaging Machines

Rotary fillers and capping carousels benefit from the Standard_VL clearance for free-running rotation. The flange mount is compatible with the flat-face frames typical in washdown machine environments.

Food and Beverage Processing

Bottle-line turntables and pasteurizer carousels use the sealed NBR design. The Standard_VL clearance allows smooth, low-resistance rotation suited to continuous operation.

Rotary Indexing Tables and Light Turntables

Assembly turntables and rotary indexers with side-mounted drives are compatible with this bearing's gearless configuration. The light clearance band suits applications where precise positioning is handled by the drive system rather than the bearing preload.

Collaborative Robots and Automation

Robotic base turntables can use this ring with a compact side pinion. The flanged outer ring eliminates a machined seat in the robot base, simplifying the structural design.

Medical and Laboratory Equipment

Imaging gantries and lab turntables require smooth, low-noise rotation under light loads. The compact envelope allows an external pinion to be fitted in enclosures where internal gear space is not available.

Light Material Handling and Amusement Equipment

Carousel conveyors, pallet rotators, and small amusement rides operate within the load range this bearing covers. The C0a of 455 kN and Standard_VL clearance are suited to these duty levels.

Interchangeability and Cross-Reference

The VLU200644 is dimensionally compatible with the Schaeffler/INA VLU 200644. The table below lists known cross-reference numbers from other manufacturers.

If your current source uses one of these references, Heng Guan can supply a dimensionally equivalent unit. Please share your drawing or existing part number so our engineering team can confirm compatibility before your order.

Quality Control

Each bearing goes through a traceability process covering raw material intake, machining, heat treatment, assembly, and final inspection. Testing equipment on site includes coordinate measuring machines, vibration testers, and life testing machines.

Products are manufactured to DIN, ISO, and GB standards. The factory holds ISO 9001 certification. All products are RoHS compliant. Precision grades P0, P6, and P5 are available.

Supply and Customization

Standard stock units are available for prompt shipment. The following configurations can be adjusted for non-standard requirements:

· Bolt pattern: pitch circle diameter, hole count, hole diameter

· Ring material: 50Mn (standard) or 42CrMo4 (higher toughness)

· Seal material: NBR (standard) or FKM for higher operating temperatures

· Surface treatment: blackening, phosphating, or zinc plating

· Precision grade: P0, P6, or P5

· Clearance class: Standard_VL or tighter clearance on request

OEM and ODM partnerships are supported. No minimum order quantity applies to standard products. Engineering support for non-standard configurations is available; 2D drawings and mapping from existing products are supported. 3D drawings are not provided.

FAQ

Q1: What is the VLU200644?

A: The VLU200644 is a gearless, flanged, single-row four-point contact ball slewing ring from the INA light series 20. It has a 644 mm raceway diameter, 534 mm bore, 748 mm outside diameter, 56 mm height, and weighs 36.4 kg.

Q2: What are the mounting dimensions of the VLU200644?

A: Bore 534 mm (21.02 in), outside diameter 748 mm (29.45 in), height 56 mm (2.21 in), weight 36.4 kg. The outer flange has 12 × 18 mm through holes on a 720 mm bolt circle; the inner ring has 16 × 18 mm through holes on a 562 mm bolt circle. Centering lands are 12 mm (T/t 12/12 mm).

Q3: What is the load capacity of the VLU200644?

A: Dynamic axial load Ca = 162 kN, static axial load C0a = 455 kN; dynamic radial Cr = 147 kN, static radial C0r = 171 kN. These values reflect the light series design and are appropriate for the low-to-medium duty applications listed above.

Q4: What is the difference between VLU200644 and VSU200644?

A: Both are gearless four-point contact rings with a 644 mm raceway diameter. The VLU200644 is the flanged light series unit (534 mm bore, 748 mm OD, 36.4 kg, Standard_VL clearance); the VSU200644 is the standard series with different bore, OD, weight, and load ratings. Selection should be based on your actual load and mounting requirements.

Q5: How is a gearless slewing ring driven?

A: By external pinion, chain or belt drive, friction wheel, or electric/hydraulic motor through a gearbox. The ring itself carries no gear teeth. This keeps unit cost and lead time lower compared to geared variants.

Contact Us

Do you have more questions about VLU200644 Slewing Bearings? Send your drawing or part number to mia@hgbearings.com.