RKS.21.0841 Slewing Bearings

RKS.21.0841 Slewing Bearings — Light Series External Gear Four-Point Contact Solution for Heavy-Duty Rotation

The RKS.21.0841 Slewing Bearings is a light series single-row four-point contact ball slewing ring with an external gear, measuring 950 × 734 × 56 mm and weighing just 68 kg. It delivers a dynamic axial load rating of 222 kN and a static rating of 580 kN, with an m8 module gear (117 teeth) offering +31% tooth force over the previous m6 group. Luoyang Heng Guan Bearing Technology Co., Ltd. is a modern enterprise with over 30 years of experience, ISO9001 certified, producing slewing bearings from 50–10,000 mm in P0/P6/P5/P4 precision grades, exported to 50+ countries worldwide.

About Heng Guan Bearing — Your Trusted Slewing Bearing Partner

Luoyang Heng Guan Bearing Technology Co., Ltd. specializes in the research, development, manufacturing, and sales of high-precision bearings. Located in Luoyang, China's bearing industry hub, our team of over 50 engineers is dedicated to R&D and precision manufacturing.

Leveraging over 30 years of industry experience, Heng Guan Bearing has earned the trust of customers worldwide through superior quality and continuous innovation. Our products are ISO9001 certified, RoHS compliant, and meet DIN, ISO, and GB international standards.

We produce slewing bearings with diameters of 50–10,000 mm across four precision grades: P0, P6, P5, and P4. Products have been exported to 50+ countries, including the United States, Germany, the United Kingdom, Australia, and the Middle East.

RKS.21.0841 Key Technical Specifications

Here are the verified full-dimensional parameters for the RKS.21 0841 slewing ring bearing:

> ✅ Dimension Accuracy Note: Some sources incorrectly list the bore as 773 mm. The correct bore per SKF catalogue is 734 mm. Always verify before ordering.

Product Advantages — Why Choose the RKS.210841 Turntable Bearing?

① m8 Large-Module Gear — 31% Higher Tooth Force

The m8 × 117-tooth external gear delivers permissible tooth forces of 21 kN (normal) and 72 kN (max). That's 31% stronger than the m6 group bearings like the 0641/0741 series. If your application involves heavier gear loads, this is the right step up.

② Four-Point Contact Ball Design

The 20 mm ball four-point contact design handles combined axial, radial, and tilting moment loads simultaneously. It's a cost-effective, high-versatility choice for light-to-medium combined load scenarios.

③ Inner-Ring Flange + Light Series Structure

The flange-type inner ring makes mounting simpler and more reliable. This L-shape range external gear slewing ring is especially popular in metallurgical and OEM swing rotation equipment.

④ Wide Temperature Seal Performance

The NBR integral seal works continuously from −40°C to +110°C. Paired with NLGI 2 lithium EP grease and four relubrication fittings, maintenance is straightforward even in demanding environments.

⑤ Interchange & Cross-Reference Clarity

The RKS.21.0841 Slewing Bearings equivalent and cross-reference includes INA VLA200844-N and Schaeffler 88.0944.00. However, the medium series RKS.061.20.0844 is not a direct replacement — its bore is 772 mm vs. 734 mm. Always verify bolt circle dimensions before substitution.

Typical Application Areas

The 21.0841 slewing bearing is trusted across multiple industries:

· Metallurgy / Blast Furnace Equipment — A unique specialty application. The flange 950×734×56mm design is widely used in blast furnace gas cover systems, an application few competitors address.

· Filling & Packaging Machines — The light series turntable bearing handles smooth, low-speed rotation in filling machine turntables.

· Construction Excavators — The light series slewing ring provides reliable articulation under combined loads.

· Bending Robots & Robotic Arms — Precision running accuracy (radial ≤ 0.2 mm) supports consistent robotic motion.

· OEM Swing & Rotation Mechanisms — Custom OEM configurations available; supports single-unit to bulk orders.

Interchange & Replacement Reference

If you're sourcing an RKS.21.0841 replacement or checking cross references, here's a quick guide:

FAQ

Q1: What is RKS.21.0841?

A: It is a light series single-row four-point contact ball slewing bearing with an external gear, built to the SKF RKS.21 standard. Key dimensions: 950 mm OD, 734 mm bore, 56 mm height, 68 kg.

Q2: What are the exact dimensions of RKS.21.0841?

A: Bore 734 mm (28.90 in), outside diameter 950 mm (37.40 in), height 56 mm (2.20 in). Gear pitch circle 936 mm, module 8, 117 teeth.

Q3: Is RKS.21.0841 equivalent to INA VLA200844-N?

A: INA VLA200844-N and Schaeffler 88.0944.00 are cross-reference numbers in the same size family. We strongly recommend verifying bolt circle details before replacement. The medium-series RKS.061.20.0844 has a different bore (772 mm) and is not a direct interchange.

Q4: What is the load capacity of this four-point contact ball slew ring?

A: Dynamic axial load rating C = 222 kN, static axial load rating C0 = 580 kN. Permissible gear tooth forces: 21 kN normal and 72 kN maximum for the normalized m8 gear.

Q5: Is RKS.21.0841 in stock? What is the delivery time?

A: Stock models ship within 3–7 days. Non-stock standard models typically ship in 25–30 days. MOQ is 1 piece. Contact Us for current availability and factory-direct pricing.

Contact Us

Ready to get your RKS.21.0841 Slewing Bearings quote? Email us at mia@hgb-bearing.com — fast response, factory-direct pricing, MOQ 1 pc.