RKS.21.0541 Slewing Bearings
• Only RKS.21 model already covered by Hengguan self-operated LYHY MIC store: "External Gear Slewing Bearing Rks. 21.0541 Turntable Bearings" — your independent station reuses the factory's own product-page assets, lowest build cost among all RKS.21 models.
• Handling manipulator / palletizer specialty keyword: tradebearings mounts it on the same page as 22 series with L-shape range wording — independent station building a deep "palletizer manipulator / bending robot" scene segment has zero competition.
• Forestry vehicle application evidence: Alibaba Forestry Vehicle listing shows another distinctive application — "4543 forestry log loaders / log sorters" extension — same 44 kg unit weight is also usable for agricultural machinery.
• Weight data correction: Alibaba Forestry listing mistakenly tags 56 kg — your page publishes 44 kg per SKF catalogue and provides an integrity moat.
• Combinatorial load wording: Alibaba "bears combined axial, radial loads and tipping moment" — exactly M4 load-spec segment hero wording for engineer-decision surfaces.
• Five-brand cross-reference table: SKF RKS.21.0541 ↔ INA VLA200544-N ↔ Kaydon RK6-22E1Z ↔ Rollix 21-0541-01 ↔ Rothe Erde E.650.20.00.C ↔ Schaeffler 88.0650.01; all six brands recognised by 0/7 competitors → 1-page table captures all cross-reference search traffic.
• L-shape flange on inner ring (Light series signature) + 4 × AM8×1 relubrication fittings on inner ring + NBR integral seal + 50Mn/42CrMo4 ring material + HRC 55-62 raceway hardness.
• Inch-explicit conversion: 434 mm = 17.09 in, 640 mm = 25.20 in, 56 mm = 2.20 in; complements mrosupply's 25 in / 33 1/9 in (0741) expression for similar Light series.
- Product Description
RKS.21.0541 Slewing Bearings — Light Series External Gear Turntable Bearing for Combined Load Applications
Luoyang Heng Guan Bearing Technology Co., Ltd. is a modern enterprise specializing in high-precision bearing R&D, manufacturing, and sales. Located in Luoyang — China's bearing industry hub — our 50+ member team brings over 30 years of expertise. We produce Slewing Bearings from 50–10,000 mm diameter across P0, P6, P5, and P4 precision grades. ISO9001 certified and RoHS compliant, our products are exported to 50+ countries. The RKS.21.0541 Slewing Bearings (640×434×56 mm, 44 kg) is a flagship light-series four-point contact ball slewing ring with external gear — engineered to deliver reliable combined load performance across demanding industrial applications.
What Makes the RKS.21.0541 a Smart Choice for Your Application?
The RKS.21.0541 is a single-row, four-point contact ball slewing ring bearing with an external gear, built to SKF RKS.21 light series standards. It handles combined axial, radial, and tilting moment loads — making it ideal where compact size and structural efficiency matter.
With a 20 mm ball diameter, module-6 external gear (105 teeth), and induction-hardened raceways at HRC 55–62, you get strength without unnecessary bulk. The L-shape flange on the inner ring is a signature feature of the light series, keeping your machine design clean and lightweight.
Full Technical Specifications
Parameter | Value |
Mean raceway diameter dm | 541 mm |
Outside diameter D (incl. gear tip) | 640 mm (25.20 in) |
Inner diameter d | 434 mm (17.09 in) |
Total height H | 56 mm ±1 mm (2.20 in) |
Weight | 44 kg (some listings show 56 kg — incorrect; 44 kg per SKF catalogue) |
Outer-ring centring diameter D2 | 542.5 mm |
Inner-ring centring diameter d1 | 498 mm |
Inner-ring inner diameter d2 | 539.5 mm |
Outer-ring bolt pattern | 14 × M12 threaded holes on Je = 585 mm circle |
Inner-ring bolt pattern | 14 × Ø18 mm plain holes on Ji = 462 mm circle |
Gear pitch circle d0 | 630 mm |
Gear module × teeth | m6 × 105T (pressure angle 20°) |
Gear tooth force Tf normal / max | 16 kN / 54 kN (3 million cycles) |
Basic dynamic axial load rating C | 188 kN |
Basic static axial load rating C0 | 380 kN |
Ball diameter | 20 mm (four-point contact) |
Ring material | C45E / 42CrMo4 / 50Mn |
Raceway hardness | HRC 55–62 (induction hardened) |
Seal | NBR integral seal, −40 ~ +110 °C |
Lubrication | NLGI 2 lithium EP grease, 4 × AM8×1 fittings on inner ring |
Speed limit | 1.5 m/s continuous / 2 m/s short-time |
Running accuracy | Radial ≤ 0.2 mm / Axial ≤ 0.3 mm |
Cross-Reference & Interchange Guide
Sourcing a direct replacement? This bearing is dimensionally interchangeable with several major-brand equivalents. Use this table to confirm your fit:
Brand | Model Number |
SKF | RKS.21.0541 |
INA | VLA200544-N |
Kaydon | RK6-22E1Z |
Rollix | 21-0541-01 |
Rothe Erde | E.650.20.00.C |
Schaeffler | 88.0650.01 |
Whether you're searching for an RKS.21.0541 Slewing Bearings replacement, an RKS.210541 equivalent, or a 21.0541 cross reference, all six brands share the same core 640×434×56 mm envelope. Our factory-direct pricing gives you a reliable alternative without compromising on quality.
Typical Application Scenarios
This slewing ring is a trusted solution across multiple industries. Here's where it excels:
· Handling manipulators & palletizers — The compact 44 kg profile and combined-load capability make it the preferred turntable bearing for robotic palletizing arms and pick-and-place systems.
· Bending robots — Smooth rotation, tight running accuracy (radial ≤ 0.2 mm), and external gear engagement suit precision bending robot joints.
· Forestry & agricultural excavator — Log loaders, log sorters, and agricultural OEM equipment benefit from the light-duty flange-type design.
· Filling & packing machines — Low-noise operation and NBR sealing handle food-grade and chemical filling line environments.
· Crane accessories — The static load rating of 380 kN supports reliable load-holding in compact crane slew drives.
Why Source from Heng Guan Bearing?
You deserve more than just a part number. Here's what working with us actually means:
· Verified weight data — We publish 44 kg per SKF catalogue. Some competitor listings incorrectly show 56 kg. Accuracy matters when you're designing a system.
· Material options — Choose C45E, 42CrMo4, or 50Mn ring material based on your duty cycle and budget.
· Flexible MOQ — Minimum order is 1 piece. No forced bulk commitments.
· Fast delivery — Stock items ship in 3–7 days. Standard non-stock models in 25–30 days.
· OEM/ODM support — We support custom gear profiles, hole patterns, and sealing configurations.
· Full traceability — Every bearing is tracked from raw material to finished product using coordinate measuring machines and vibration testers.
FAQ
Q: What is RKS.21.0541?
A: It is a light series single-row four-point contact ball slewing bearing with an external gear, made to SKF RKS.21 standards. Key dimensions: 434 mm bore, 640 mm OD, 56 mm height, 44 kg weight.
Q: What are the exact dimensions of RKS.21.0541?
A: Bore 434 mm (17.09 in), outside diameter 640 mm (25.20 in) including gear tips, height 56 mm (2.20 in). Gear pitch circle 630 mm, module 6, 105 teeth.
Q: Is RKS.21.0541 equivalent to INA VLA200544-N?
A: Yes. INA VLA200544-N, Kaydon RK6-22E1Z, Rollix 21-0541-01, Rothe Erde E.650.20.00.C, and Schaeffler 88.0650.01 are all dimensionally interchangeable with this bearing.
Q: What is the load capacity of RKS.21.0541?
A: Dynamic axial load rating C = 188 kN, static axial load rating C0 = 380 kN. The four-point contact design handles combined axial, radial, and tilting moment loads. Permissible gear tooth force: 16 kN normal, 54 kN maximum.
Q: Is RKS.21.0541 in stock?
A: Stock models ship within 3–7 days. Non-stock standard models are ready in 25–30 days. MOQ is 1 piece.
Q: How often should I re-lubricate this bearing?
A: A general guideline is every 100 operating hours for the raceway. The 4 × AM8×1 relubrication fittings on the inner ring make greasing straightforward. In high-humidity or continuous-rotation environments, increase frequency accordingly.
Contact Us
Ready to Get a Quote for RKS.21.0541 Slewing Bearings? Contact our engineering team today at mia@hgb-bearing.com — MOQ 1 pc, fast delivery, factory-direct pricing.
WHAT OUR CUSTOMERS SAY
Here is the customer's evaluation of us