RKS.21.0941 Slewing Bearings
• Lifting Machine is the unique specialty application: Coresun Drive titles "Rks. 21 0941 L Shaped Slewing Bearing for Lifting Machine" — only 1/6 competitor coverage; your page owns the lifting-machine / crane-turntable scenario (OEM verticals like construction cranes and lifting hoists).
- Product Description
RKS.21.0941 Slewing Bearings — Light Series External Gear Turntable Bearing with C0 664 kN Highest Static Load
The RKS.21.0941 Slewing Bearings is a light series single-row four-point contact ball slewing ring bearing with an external gear, built to SKF RKS.21 standard. At 1046 × 834 × 56 mm (41.18 × 32.83 × 2.20 in) and 76 kg, it carries the highest static load rating in the RKS.21 family — C0 664 kN. Luoyang Heng Guan Bearing Technology Co., Ltd. is a modern enterprise with over 30 years of experience, ISO9001 certified, exporting to 50+ countries. We produce slewing bearings from 50 to 10,000 mm diameter in P0, P6, P5, and P4 precision grades.
Full Technical Specifications of RKS.21 0941 Slewing Ring Bearing
Getting the dimensions right matters — especially for crane turntable and lifting machine applications. One note: the 898 mm figure is the inner-ring centring diameter (d1), not the third main dimension. The correct size is 1046 × 834 × 56 mm.
Parameter | Value |
Mean raceway diameter dm | 941 mm |
Outside diameter D (incl. gear tip) | 1046 mm (41.18 in) |
Inner diameter d | 834 mm (32.83 in) |
Total height H | 56 mm ±1 mm (2.20 in) |
Outer-ring centring diameter D2 | 942.5 mm |
Inner-ring centring diameter d1 | 898 mm (centring Ø only) |
Inner-ring inner diameter d2 | 939.5 mm |
Weight | 76 kg |
Outer-ring bolt pattern | 20 × M12, Je = 985 mm circle (threaded) |
Inner-ring bolt pattern | 20 × Ø18 mm, Ji = 862 mm circle (plain) |
Gear pitch circle d0 | 1032 mm |
Gear module × teeth | m8 × 129 teeth, pressure angle 20° |
Permissible gear tooth force (normal / max) | 21 kN / 72 kN (3M cycles, normalized) |
Basic dynamic axial load rating C | 231 kN |
Basic static axial load rating C0 | 664 kN (Light series highest) |
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 |
Speed limit | 1.5 m/s continuous / 2 m/s short-time |
Running accuracy | Radial ≤ 0.2 mm / Axial ≤ 0.3 mm |
Key Product Advantages You'll Appreciate
Highest static load in its class. With C0 = 664 kN, the 21.0941 delivers the top static rating across the entire RKS.21 light series — ideal for lifting gear, metallurgy, and OEM swing mechanisms where peak load control is critical.
L-shaped flange inner-ring design. The inner ring features a flange (L-shaped) structure, which simplifies mounting and improves axial positioning stability. This is a genuine structural advantage for crane turntable and lifting machine builders.
Induction-hardened raceways, HRC 55–62. The raceways are surface-hardened while the core stays tough and ductile. You get excellent fatigue resistance against shock loads without brittleness.
NBR integral seal rated −40 ~ +110 °C. The seal handles wide temperature ranges and keeps contamination out. Four AM8×1 relubrication fittings on the inner ring make maintenance straightforward in the field.
Verified dimensions, zero confusion. We publish the correct dimensions — 1046 × 834 × 56 mm — per SKF catalogue. You won't encounter the 898 mm misprint that misleads engineers on other supplier pages.
Cross Reference & Interchange Guide for RKS.210941
If you're sourcing a replacement or comparing alternatives, here's what you need to know:
· INA VLA200944-N / Schaeffler 88.1044.00 — inferred interchange in the same size family; verify bolt circle details before substitution.
· RKS.061.20.0944 — similar outside diameter (1046.4 mm) but bore is 872 mm (not 834 mm). Not a direct interchange. Always confirm d1 and bolt pattern before replacing a light-series unit with a medium-series one.
We recommend contacting our engineers for final cross-reference confirmation. Dimensions matter more than part numbers.
Where Is RKS.21.0941 Used?
RKS.21.0941 Slewing Bearings is a light duty four-point contact ball slewing bearing with large diameter external gear that fits a wide range of industrial applications:
· Lifting machines & construction cranes — the primary specialty application; handles combined axial, radial, and moment loads in hoisting rotation
· Filling & packing machines — smooth, low-noise rotation for high-speed production lines
· Metallurgy & blast furnace equipment — reliable performance in high-temperature, heavy-load environments
· Excavators & engineering excavator — light series suits mid-size swing mechanisms
· OEM turntable & swing mechanisms — flexible for custom rotary drive integration
Why Choose Heng Guan Bearing as Your China Manufacturer?
You're looking for more than just a part number — you need a supplier you can count on.
Our team of 50+ engineers and technicians has been producing slewing ring bearings for over 30 years in Luoyang, China's bearing manufacturing hub. Every bearing goes through coordinate measuring machines, vibration testers, and life testing before it ships. Raw materials are fully traceable from steel mill to finished product.
We support OEM/ODM partnerships, provide installation guidance, and can reverse-engineer old bearings from your samples or 2D drawings. Standard products ship in 3–7 days; non-stock models in 25–30 days. MOQ is just 1 piece — no large commitment required to get started.
Our products meet DIN, ISO, and GB standards, and are RoHS compliant. We've served customers in 50+ countries across Europe, North America, Southeast Asia, the Middle East, and beyond.
FAQ
Q: What is RKS.21.0941?
A: It is a light series single-row four-point contact ball slewing bearing with an external gear, built to SKF RKS.21 standard. Key specs: 941 mm mean raceway diameter, 834 mm bore, 1046 mm OD, 56 mm height, 76 kg weight.
Q: What are the correct dimensions of RKS.21.0941?
A: Bore 834 mm (32.83 in), outside diameter 1046 mm (41.18 in) including gear tips, height 56 mm (2.20 in). Note: 898 mm is the inner-ring centring diameter only — not a main dimension.
Q: What is the load capacity?
A: Dynamic axial load rating C = 231 kN; static axial load rating C0 = 664 kN — the highest in the RKS.21 light series. Permissible gear tooth force: 21 kN normal / 72 kN max for the m8 normalized gear.
Q: Is RKS.21.0941 equivalent to INA VLA200944-N?
A: INA VLA200944-N and Schaeffler 88.1044.00 are inferred interchanges in the same size family. We recommend factory verification of bolt circle details before substitution. The medium-series RKS.061.20.0944 is not a direct replacement due to different bore (872 mm vs. 834 mm).
Q: Is it in stock and what is the lead time?
A: Stock units ship within 3–7 business days. Non-stock standard models take 25–30 days. Contact Us for real-time availability and factory-direct pricing.
Q: What is the re-lubrication interval?
A: For standard duty cycles, relubricate every 100 operating hours via the four AM8×1 fittings. In humid or high-load environments, shorten the interval and use NLGI 2 lithium EP grease to flush contaminants.
Contact Us
Ready to order or need a datasheet with RKS.21.0941 Slewing Bearings? Email us at mia@hgb-bearing.com — MOQ 1 pc, fast response guaranteed.
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