VLA200744-N Slewing Bearings

VLA200744-N Slewing Bearings — Flanged Light Series External Gear Four-Point Contact Ball Bearing

VLA200744-N Slewing Bearings are flanged light-series external-gear four-point contact ball bearings compatible with the INA/Schaeffler VLA light series 20. Built around a 744 mm raceway diameter, 634 mm bore, 838.1 mm outside diameter, and 56 mm height, each unit weighs 54.5 kg. The external gear (m6 / z138) sits on the outer ring, and the double-lip NBR seal protects the raceways. Heng Guan manufactures these bearings in Luoyang, China, with in-house CNC turning, quenching, gear shaping, and grinding equipment.

Full Technical Specifications

Design and Load Characteristics

The four-point contact ball design lets a single ball row engage four raceway points at once, so axial loads, radial loads, and tilting moment loads are all handled within one bearing row. For applications where load combinations would otherwise require stacking multiple bearing types, this single-row arrangement keeps the assembly height and weight lower.

The external gear (m6 / z138) is machined on the outer ring, which positions the drive pinion or worm gear outside the ring diameter. The hub or table then mounts directly through the bore, keeping the drive system compact without a separate intermediate Shaft.

The flanged envelope uses T/t = 12 mm centering lands that locate directly against a flat structural surface. No counterbore or separate locating ring is required, which reduces the number of machined surfaces needed on the mating structure.

At 54.5 kg with C0a = 530 kN, this bearing is sized for light-duty rotary applications where over-engineered clearances would cause binding. Standard_VL clearance — radial 0–0.5 mm, axial tilting 0–0.7 mm — is selected for free-running light pivots rather than preloaded precision positioning.

Typical Application Areas

The VLA200744-N Slewing Bearings suit several categories of light-load rotary equipment:

Filling and Packaging Machines — Rotary fillers and capping carousels run at moderate loads in continuous slow rotation. Placing the drive pinion outside the ring keeps the filler deck unobstructed.

Food and Beverage Processing — Bottle-line turntables and pasteurizer carousels benefit from the double-lip NBR seal and the Standard_VL clearance that prevents binding during washdown cycles.

Rotary Indexing Tables — Assembly turntables pair with a side-pinion drive; the flange mounts directly to the table frame without requiring machined seats.

Collaborative Robots and Automation — Robotic base turntables use the flanged ring where the drive gearbox engages the outer ring gear, and the flange eliminates an extra machined seat in the robot pedestal.

Medical and Laboratory Equipment — Imaging gantries and lab turntables require smooth, low-load rotation. The single-row design keeps frictional torque low relative to multi-row alternatives.

Small Solar Trackers — The -25 to +80 °C operating range covers typical PV farm climates, and the m6/z138 gear supports compact tracker drive systems.

Light Material Handling and Amusement — Carousel conveyors and pallet rotators operate in the load and speed range this light-series bearing is designed for.

Material and Sealing

Ring material options are 50Mn and 42CrMo4. 50Mn is a cost-effective high-manganese structural steel suitable for standard-duty cycles. 42CrMo4, supplied in a quenched and tempered condition, provides higher core toughness for more demanding operating cycles.

Rolling elements are GCr15 bearing steel balls, which deliver consistent hardness and wear resistance across the raceway contact zone.

The double-lip NBR seal retains grease and excludes contaminants. NBR seals are compatible with standard mineral greases and perform across the specified -25 to +80 °C temperature range.

Cross-Reference and Interchangeability

This bearing is a direct dimensional replacement for the Schaeffler / INA VLA 200 744-N. Cross-references include:

· SKF RKS.21 0741 (light-series external-gear equivalent)

· Kaydon RK6-29E1Z

· Rothe Erde 231.20.0700 / 91-20 0741

· Rollix 21-0741-01

Heng Guan manufactures to the identical INA mounting standard, so substitution does not require changes to your existing bolt pattern or locating features. (Referenced brand names are used for cross-reference identification only and remain the property of their respective owners.)

Quality Control and Supply

Each VLA200744-N unit produced at Heng Guan goes through coordinate measuring machines, vibration testers, and life testing machines before leaving the facility. Raw material traceability is maintained from steel mill certificates through final inspection records.

Production equipment — CNC vertical lathes, CNC quenching machines, CNC gear shapers, grinding machines, and large gear hobbing machines — is all in-house in Luoyang.

Customization options include bolt patterns, ring material grade, seal type, surface treatment, precision class (P0 / P6 / P5), and clearance class. OEM and ODM partnerships are supported. 2D drawings are available on request; 3D drawings are not provided.

Packaging

Each bearing is individually wrapped in anti-rust paper, placed in a wooden box or custom export-grade carton, and secured against movement during sea or air freight. Packages are labeled with model, batch number, and inspection certificate for full traceability.

FAQ

Q: What is the VLA200744-N?

A: It is a flanged external-gear four-point contact ball slewing ring from the INA VLA light series 20. Key dimensions: 744 mm raceway, 634 mm bore, 838.1 mm OD, 56 mm height, 54.5 kg weight, with external gear m6/z138 on the outer ring.

Q: What are the gear specifications?

A: The external gear is on the outer ring with module m6 and tooth count z138. Clearance is Standard_VL: radial 0–0.5 mm, axial tilting 0–0.7 mm. Sealing is double-lip NBR.

Q: What is the load capacity?

A: Dynamic axial Ca = 171 kN, static axial C0a = 530 kN; dynamic radial Cr = 155 kN, static radial C0r = 197 kN. Maximum radial load on fixing screws is 74.3 kN.

Q: Is VLA200744-N the same as VSA200744-N?

A: No. Both use a 744 mm raceway with external-gear four-point contact design, but VLA is the flanged light series (C0a 530 kN, 54.5 kg) while VSA is the standard series (C0a 1,200 kN — approximately 2.3× higher). Selection should be based on the actual duty load of your application.

Q: Which brands does VLA200744-N replace?

A: It cross-references to SKF RKS.21 0741, Kaydon RK6-29E1Z, Rothe Erde 231.20.0700 / 91-20 0741, and Rollix 21-0741-01. Heng Guan produces to the identical INA mounting standard.

Contact Us

Do you have more questions about VLA200744-N Slewing Bearings? Send your inquiry or technical question to mia@hgbearings.com. Our engineering team will review your requirements and respond as soon as possible.