VLA200644-N Slewing Bearings
Dimensions & Weight: Bore 534 mm × OD 742.3 mm × Height 56 mm | Weight: 48.5 kg.
Load Rating & Selection Note: Static axial $C_{0a} = 455\text{ kN}$ (2.3× lower than Standard Series VSA 200 644-N at 1,046 kN; choose VSA if static axial load requirement is $\ge 1000\text{ kN}$).
Applications: Flagship choice for Solar Trackers & Slewing Drives; also fits Packaging, Cobots, Rotary Indexing Tables, and Light Turntables.
Interchange Equivalents: SKF RKS.21 643 / RKS.21 0641, Kaydon RK6-25E1Z, Rothe Erde 231.20.0600, and Rollix 21-0641-01.
Supply & Customization: Direct factory options available; MOQ 1 pc (stock ships 2–3 days; custom/OEM production 25–60 days). Custom bolt patterns, seals, and clearance variants available.
- Product Description
VLA200644-N Slewing Bearings — Flanged External-Gear Light Series
VLA200644-N Slewing Bearings are flanged, single-row, four-point contact ball rings from the INA/Schaeffler Light Series 20. The bearing seats on a 644 mm raceway diameter, measures 742.3 mm OD × 534 mm bore × 56 mm height, and weighs 48.5 kg. An outer-ring external gear (m6 / z122) enables direct pinion or worm engagement. The static axial load rating is C₀a = 455 kN, making this model a practical choice for solar trackers, rotary indexing tables, packaging machines, and collaborative robot bases.
What Is the VLA200644-N Slewing Bearing?
The VLA 200 644-N (also referenced as VLA20 0644-N or VLA 20 644) is a single-row, four-point contact ball slewing ring from the INA flanged light series. One ball row carries axial, radial, and tilting moment loads simultaneously — a configuration suited to moderate-duty, continuous-rotation platforms where minimizing overall height and weight matters.
The external gear (m6 / z122) is machined on the outer ring, allowing direct pinion or worm engagement without additional gear stages. The 534 mm through-bore keeps cable and pneumatic routing clean inside the pivot column. The 12 mm flange with T/t 12 mm centering lands allows direct structural bolting to the host frame without a counterbore or separate locating ring.
Heng Guan Bearing manufactures this model as a dimensionally interchangeable replacement for the INA/Schaeffler VLA200644-N mounting standard. Cross-reference numbers include SKF RKS.21 0641, Kaydon RK6-25E1Z, Rothe Erde 231.20.0600, and Rollix 21-0641-01.
Technical Specifications
Parameter | Value |
Raceway Diameter | 644 mm |
Inner Ring Bore (d) | 534 mm (21.02 in) |
Outside Diameter (D) | 742.3 mm (29.22 in) |
Total Height (H) | 56 mm (2.21 in) |
Flange Height (hf) | 12 mm |
Centering Diameter (hA) | 20 mm |
Centering Lands (T/t) | 12 / 12 mm |
Fixing Bore (dB) | 18 mm through holes (inner ring) (inner ring) |
Outer Bolt Circle (La) | 685 mm / 16 × M12 threaded holes, thread depth 20 mm |
Inner Bolt Circle (Li) | 562 mm / 16 × 18 mm through holes (inner ring) (inner ring) (inner ring) |
Max. Radial Load on Screws (Fr zul) | 66.1 kN |
Dynamic Axial Load (Ca) | 162 kN |
Static Axial Load (C₀a) | 455 kN |
Dynamic Radial Load (Cr) | 147 kN |
Static Radial Load (C₀r) | 171 kN |
External Gear | m6 / z122 (outer ring) |
Radial Clearance | 0 – 0.5 mm (Standard_VL) |
Axial Tilting Clearance | 0 – 0.7 mm |
Operating Temperature | -25 °C to +80 °C |
Structure / Row | Four-point contact ball / single row |
Precision Class | P0 / P6 / P5 |
Ring Material | 50Mn / 42CrMo4 |
Ball Material | GCr15 |
Seal | Double-lip NBR |
Weight | 48.5 kg |
Design Notes
Four-Point Contact Ball Structure
A single ball row handles axial, radial, and tilting moment loads together, removing the need for separate thrust and radial bearings in light-duty rotation platforms where vertical envelope is limited.
External Gear m6 / z122
The module-6, 122-tooth gear on the outer ring provides a wide tooth profile for steady pinion engagement. It works with both speed-reduction drives and direct worm gear configurations.
Flanged Light-Series Mounting
The 12 mm flange and T/t 12 mm centering lands allow direct bolting to the host structure. No counterbore machining or separate locating ring is required.
Standard_VL Clearance
Radial clearance of 0–0.5 mm and axial tilting clearance of 0–0.7 mm are slightly wider than standard-series values. This suits low-preload operating conditions such as solar tracker pivots and light carousel drives.
VLA vs. VSA — Series Comparison
VLA200644-N slewing bearings (light series) carries C₀a = 455 kN at 48.5 kg. The VSA 200 644-N (standard series) carries C₀a = 1,040 kN — approximately 2.3× higher. For static axial load requirements at or above 1,000 kN, the VSA series is the appropriate selection. For solar trackers, packaging rotaries, and cobot bases operating within the VLA rating, the lighter envelope is an advantage.
Application Scenarios
Solar Trackers & Slewing Drives
The -25 °C to +80 °C operating range covers a wide range of PV farm climates. The outer-ring external gear engages the tracker drive pinion inside the support column, keeping the pivot assembly compact.
Filling & Packaging Machines
Rotary fillers and capping carousels operate under moderate, continuous loads. The double-lip NBR seal protects the raceway in washdown environments, and the external gear positions the drive pinion outside the machine deck for routine service access.
Rotary Indexing Tables & Light Turntables
Assembly turntables and indexers work with the m6/z122 outer gear. The Standard_VL clearance tolerates small positional offsets during indexing cycles without requiring tight shimming.
Collaborative Robots & Automation
The 534 mm through-bore routes cables and pneumatic lines without external conduit. The flanged mounting removes the need for a machined locating seat in the robot pedestal.
Medical & Laboratory Equipment
Imaging gantries and lab turntables requiring smooth, low-load rotation can use the four-point contact design with GCr15 balls and induction-hardened 50Mn/42CrMo4 raceways.
Materials & Quality Control
Ring steel options are 50Mn and 42CrMo4. 42CrMo4 in quenched and tempered condition provides higher core toughness alongside surface wear resistance. Raceways are induction-hardened to 55–62 HRC. GCr15 bearing steel is used for balls. The double-lip NBR seal retains grease and restricts contaminant ingress under standard operating conditions.
Units are inspected using coordinate measuring machines and vibration testers. Full material and process traceability is maintained from raw steel to finished bearing. Heng Guan Bearing holds ISO 9001 certification, and products are RoHS compliant.
Supply & Customization
· MOQ: 1 piece
· Stock lead time: 5–7 working days
· Custom / OEM production: 30–45 days
· Precision options: P0, P6, P5
· Custom options: bolt patterns, seal compounds, clearance variants, OEM marking
· Export markets: 50+ countries including the USA, Germany, UK, Italy, Turkey, Russia, Australia, Malaysia, and the Middle East
Heng Guan Bearing supports OEM/ODM partnerships and provides technical consultation, product design guidance, and cross-reference mapping services.
FAQ
Q: What is the VLA200644-N slewing bearing?
A: VLA 200 644-N is a flanged external-gear four-point contact ball slewing ring from the INA light series 20. It has a 644 mm raceway diameter, 534 mm bore, 742.3 mm OD, 56 mm height, and weighs 48.5 kg. The external gear is m6/z122 on the outer ring.
Q: What are the gear and clearance specifications?
A: The external gear sits on the outer ring: module m6, tooth count z122. Radial clearance is 0–0.5 mm (Standard_VL); axial tilting clearance is 0–0.7 mm. The bearing uses double-lip NBR seals.
Q: What load ratings does the VLA200644-N carry?
A: Dynamic axial Ca = 162 kN, static axial C₀a = 455 kN; dynamic radial Cr = 147 kN, static radial C₀r = 171 kN. Maximum radial load on fixing screws is 66.1 kN.
Q: Is the VLA200644-N the same as the VSA200644-N?
A: No. Both use a 644 mm raceway and external gear, but they belong to different series. VLA200644-N is the flanged light series (C₀a 455 kN, 48.5 kg). VSA 200 644-N is the standard series with C₀a 1,040 kN. Selection depends on the actual static axial load in the application.
Q: Which brands does the VLA200644-N cross-reference?
A: Cross-references include SKF RKS.21 0641, Kaydon RK6-25E1Z, Rothe Erde 231.20.0600, and Rollix 21-0641-01. Heng Guan manufactures to the INA mounting standard for these references. All brand names are referenced for compatibility identification only; Heng Guan Bearing is an independent manufacturer and is not affiliated with the brands listed above. All brand names are referenced for compatibility identification only; Heng Guan Bearing is an independent manufacturer and is not affiliated with the brands listed above.
Q: What bolt grade is required for mounting?
A: High-strength bolts of grade 10.9 or 12.9 (ISO) are required. Use bolts with an unthreaded shank in the shear plane where clamping through the inner ring. The inner ring uses 16 × 18 mm through holes (inner ring) (inner ring) on a 562 mm PCD. The outer ring uses 16 × M12 threaded holes on a 685 mm PCD with a thread depth of 20 mm, so bolts thread directly into the ring at that circle.
Contact Us
Have a technical question or need a quote with VLA200644-N slewing bearings? Email us at mia@hgbearings.com. MOQ is 1 piece.
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