RKS.21.0741 Slewing Bearings

RKS.21.0741 is a light series single row four point contact ball slewing bearing with an external gear, manufactured to the SKF RKS.21 standard. With a 741 mm mean raceway diameter, 634 mm bore, 840 mm outside diameter (gear tip) and 56 mm height, it weighs 60 kg and carries combined axial, radial and tilting moment loads. The gear is normalized tooth with module 6 and 138 teeth — the highest-tooth-count size in the m6 group.

• Highest-density competitor coverage across RKS.21 series — proves real demand: BSPD model page + LKPB replacement page + rigbrsbearing Light-series definition page + tradebearings product page + mrosupply 25 in / 33 1/9 in English-spec page + Alibaba Gumi five-number comparison table — six independent pages exist; nobody consolidates all six into one master SKU.

Product Description

RKS.21.0741 Slewing Bearings — Light Series External Gear Four-Point Contact Ball Slewing Ring for Combined Load Applications

Luoyang Heng Guan Bearing Technology Co., Ltd. is a modern enterprise specializing in high-precision bearings, backed by over 30 years of industry experience. Our RKS.21.0741 Slewing Bearings is a light series, single-row, four-point contact ball slewing ring with an external gear (module 6 × 138 teeth). Key dimensions: OD 840 mm, bore 634 mm, height 56 mm, weight 60 kg. Dynamic load rating C = 211 kN, static C₀ = 524 kN. ISO9001 certified, RoHS compliant, exported to 50+ countries. MOQ 1 pc, stock models ship in 3–7 days.

What Is the RKS.21.0741 Slewing Ring Bearing?

The RKS.21.0741 Slewing Bearings is a light series, single-row, four-point contact ball slewing bearing with an external gear, built to SKF RKS.21 series standards. It carries combined axial, radial, and tilting moment loads — all in one compact ring.

The inner-ring flange structure gives it a distinct edge: lighter weight and more stable rotation compared to conventional designs. That makes it a smart fit for OEM swing mechanisms, filling machine turntables, packaging line slew rings, light excavators, bending robots, and crane accessories.

If you need a proven mid-size light-duty turntable bearing with gear drive, the RKS.210741 is worth a close look.

Full Technical Specifications

Parameter	Value
Mean raceway diameter dm	741 mm
Outside diameter D (incl. gear tip)	840 mm (33.07 in)
Inner diameter d	634 mm (24.96 in)
Outer-ring centring diameter D2	742.5 mm
Inner-ring centring diameter d1	698 mm
Inner-ring inner diameter d2	739.5 mm
Total height H	56 mm ± 1 mm (2.20 in)
Weight	60 kg
Outer-ring bolt pattern	18 × M12 threaded holes on Je = 785 mm circle
Inner-ring bolt pattern	16 × Ø18 mm plain holes on Ji = 662 mm circle
Gear pitch circle d0	828 mm
Gear module × teeth	m6 × z138, pressure angle 20°
Permissible tooth force (normal / max)	16 kN / 54 kN (3 million cycles)
Basic dynamic axial load rating C	211 kN
Basic static axial load rating C₀	524 kN
Ball diameter	20 mm (four-point contact)
Ring material	C45E / 42CrMo4 / 50Mn
Raceway hardness	HRC 55–62 (induction hardened)
Seal	NBR integral seal, sealed on both sides, −40 ~ +110 °C
Lubrication	NLGI 2 lithium EP grease, 4 × AM8×1 fittings on inner ring
Speed limit	1.5 m/s continuous / 2.0 m/s short-time (circumferential)
Running accuracy	Radial ≤ 0.2 mm / Axial ≤ 0.3 mm

Cross-Reference & Interchangeable Part Numbers

Shopping for a RKS.21.0741 replacement or equivalent? Here are the verified interchangeable part numbers across major brands:

Brand	Part Number
SKF	RKS.21.0741 / RKS.21 0741 / 21.0741
INA (Schaeffler)	VLA200744-N / VLA200744 / 88.0844.00
Kaydon	RK6-29E1Z
Rollix	21-0741-01
Rothe Erde	E.850.20.00.C / 91-20 0741

All six brands share the same key envelope (840 × 634 × 56 mm) and four-point contact ball design. Always confirm d1 and bolt-circle dimensions before substitution, especially when comparing with similar-OD medium-series models like RKS.061.20.0744 (d = 672 mm vs. 634 mm — not a direct drop-in).

Key Product Advantages

Four-point contact ball design means one compact ring handles axial, radial, and tilting moment loads simultaneously — no need for separate thrust arrangements.

Inner-ring flange structure reduces overall weight while delivering stable, smooth rotation. This is a distinguishing feature of the RKS.21 light series that engineers working on OEM swing bearings and turntable mechanisms appreciate immediately.

Induction-hardened raceways (HRC 55–62) on 42CrMo4 or 50Mn steel give you excellent fatigue resistance, even under oscillating or combined loads. The NBR integral seal (sealed on both sides, −40 ~ +110 °C) keeps grease in and contaminants out — no extra sealing hardware needed.

Gear module m6, 138 teeth — the highest tooth count in the m6 group — delivers smooth, distributed load transfer ideal for precision-driven turntable applications.

RKS.21.0741 Slewing Bearings factory

Typical Application Areas

This light series external gear turntable bearing fits well across several industries:

· OEM swing & slewing mechanisms — compact footprint, combined-load capability

· Filling & packaging excavator — smooth low-speed rotation, low noise, easy relubrication

· Light excavators & construction equipment — shock-tolerant raceway, sealed design

· Bending robots & industrial manipulators — high positional accuracy, stable flange mounting

· Crane accessories — reliable gear engagement under variable load cycles

RKS.21.0741 Slewing Bearings application

Why Choose Heng Guan Bearing?

We produce slewing bearings from 50 mm to 10,000 mm diameter, covering precision grades P0, P6, P5, and P4. Our manufacturing line includes CNC vertical lathes, CNC gear shapers, CNC quenching machines, large gear hobbing machines, and grinding machines.

Every bearing goes through coordinate measuring machines, vibration testers, and life testing machines before it leaves the factory. Full material traceability is maintained from raw steel to finished product.

We support OEM/ODM partnerships and offer technical consultation, installation guidance, old-product mapping, and non-standard customization. Our products have reached customers in 50+ countries across Europe, North America, Southeast Asia, and the Middle East.

RKS.21.0741 Slewing Bearings certification

FAQ

Q1: What exactly is RKS.21.0741?

A: It is a light series single-row four-point contact ball slewing bearing with an external gear, built to SKF RKS.21 standards. Mean raceway diameter 741 mm, OD 840 mm, bore 634 mm, height 56 mm, weight 60 kg.

Q2: What are the exact dimensions of RKS.21.0741?

A: Bore 634 mm (24.96 in), outside diameter 840 mm (33.07 in) including gear tips, height 56 mm (2.20 in). Gear pitch circle 828 mm, module 6, 138 teeth.

Q3: Is RKS.21.0741 equivalent to INA VLA200744-N?

A: Yes. INA VLA200744-N, Kaydon RK6-29E1Z, Rollix 21-0741-01, and Rothe Erde E.850.20.00.C are all dimensionally interchangeable. Verify d1 and bolt-circle before final installation.

Q4: What is the load capacity of RKS.21.0741?

A: Dynamic axial load rating C = 211 kN, static C₀ = 524 kN. Permissible gear tooth force: 16 kN normal, 54 kN maximum. The four-point contact design handles combined axial, radial, and tilting moment loads.

Q5: Is RKS.21.0741 in stock? What is the lead time?

A: Stock models ship within 3–7 business days. Non-stock standard models take 25–30 days. MOQ is 1 pc. Contact Us for real-time availability and factory-direct pricing.

Contact Us

Ready to order or need a datasheet with RKS.21.0741 Slewing Bearings? Email us at mia@hgb-bearing.com — we respond within 24 hours.

WHAT OUR CUSTOMERS SAY

Here is the customer's evaluation of us

From Europe

As a leading construction machinery manufacturer in Europe, we are very impressed with the quality and performance of your slewing rings. The precision machining and consistent quality meet our strict standards. A reliable global supplier!

From United States

Our CT scanners require extremely smooth rotation, low noise, and no magnetic interference. Your product perfectly meets these requirements, operating virtually silently without compromising image quality. Your technical expertise is truly impressive!

From Southeast Asia

We have been the distributor of your brand for many years and have received excellent customer feedback. Your diverse product line meets diverse customer needs, and our consistent quality makes us very competitive in the market. Your technical support and service team are also fantastic!

From United States

The slewing bearing selected for our wind turbine main drive system has exceeded our expectations in terms of precision and reliability. It operates smoothly even in extreme wind conditions and has a long maintenance cycle, significantly reducing our lifecycle costs. We are a trustworthy partner!

From the Middle East

Our equipment required a slewing bearing with non-standard dimensions and special gears. We contacted several companies but they all said they couldn't make it. Not only did you accept the order, but we also communicated smoothly throughout the entire process from proofing to mass production, and the finished product fully met our design requirements. This customization capability demonstrates your true technical strength.

From Europe

We have integrated your slewing rings into our new line of crawler cranes. The performance under full load and in extreme weather conditions has been flawless. The precision and durability meet the highest European standards. A truly reliable component for critical applications.

From North America

The harsh, sandy environment of our port is a true test for any equipment. Your slewing bearings' superior sealing system has effectively kept out abrasive contaminants. Our ship-to-shore cranes have seen a dramatic increase in uptime and service life since switching to your brand.

From the Middle East

In the mining industry, equipment failure is not an option. The immense strength and robust construction of your large-diameter slewing bearings have withstood the incredible shocks and loads in our mining excavators. Their reliability is directly contributing to our productivity.