RKS.22.1091 Slewing Bearings

RKS.22.1091 Slewing Bearings | Internal Gear Four Point Contact Ball | Largest RKS.22 Light Series

Luoyang Heng Guan Bearing Technology Co., Ltd. is your trusted source for the RKS.22.1091 Slewing Bearings — the flagship of the SKF RKS.22 light series. This single-row four-point contact ball turntable bearing features a 1198×986×56 mm envelope, 80 kg weight, and the series-highest static axial load rating of C0 766 kN (+15% over 0941). With 125 internal gear teeth (module 8, 87 kN max tooth force), it is built for center-drive systems in tower cranes, elevating work platforms, and industrial robots. Heng Guan delivers factory-direct with MOQ 1 pc and ships stock in 3–7 days.

Full Technical Specifications of RKS.22 1091 Internal Gear Turntable Bearing

Gear Type Comparison — Same 1091 Envelope

> Note: The medium-series RKS.062.25.1644 uses a different locating system and is not a direct interchange — verify bolt circles and centring diameters before substitution.

Cross Reference & Interchange for RKS.22.1091

Looking for a VLI201094-N equivalent or a direct replacement? The table below maps known interchangeable part numbers. Always verify mounting dimensions before final substitution.

Need help confirming the right 22.1091 replacement? Send us your drawing or existing part number and our engineers will respond within 24 hours.

Key Performance Advantages of the RKS.22 Light Series Largest Size

This bearing sits at the top of the RKS.22 series load ladder: 580 → 664 → 766 kN static axial capacity across the three largest sizes. That 15% jump over the 0941 model makes the 22.1091 the right choice when your application is pushing load limits.

The L-shape flange design with internal gear keeps the drive pinion centered inside the ring, reducing radial footprint. The four-point contact ball arrangement handles combined axial, radial, and moment loads in a single compact row — ideal where height and weight budgets are tight.

Raceway hardness of HRC 55–62 (induction hardened, 3–5 mm effective depth) ensures long fatigue life under cyclic loading. The integral NBR seals maintain protection from −40 °C to +110 °C, covering outdoor and cold-climate deployments.

Application Scenarios for Internal Gear Slewing Ring Bearings

Tower Cranes & Jib Cranes — The center-drive internal gear turntable bearing handles full slewing torque while the compact 56 mm height saves headroom in the mast-head structure. The 87 kN maximum tooth force rating covers heavy lifts without gear tooth fatigue.

Elevating Work Platforms (EWP) — Platform rotation demands smooth low-speed movement and reliable braking. The four-point contact ball design and tight running accuracy (axial ≤ 0.3 mm) keep the platform level during rotation.

Excavators & Construction Excavator — High shock loads, vibration, and dirt ingress are constants on site. The 42CrMo4/50Mn ring material and induction-hardened raceways resist the spalling that kills inferior bearings early.

Precision Rotary Working Tables — Radial accuracy ≤ 0.2 mm supports repeatable positioning for machining and assembly automation.

Bending Robots, Gantry Robots & Robot Palletizers — Compact envelope and low friction make this internal gear turntable bearing a natural fit for robot base joints where space and weight matter.

Solar Trackers — Continuous low-speed rotation, outdoor exposure, and long maintenance intervals suit the 4-nipple relubrication system and sealed NBR design perfectly.

Ordering Information & Pricing

You can get a factory-direct price for the RKS.22.1091 Slewing Bearings — no middlemen, no inflated margins. Whether you need one piece for maintenance or a bulk order for a production line, we handle both with the same care.

FAQ

Q1: What material and hardness should a quality slewing bearing have?

A: Quality products use forged alloy steel (50Mn or 42CrMo4). After induction hardening, raceway hardness should be HRC 55–62 with an effective hardened depth of 3–5 mm. Gear tooth surfaces should reach HRC 50–60 from root to tip. Always request a material certificate and hardness test report when purchasing.

Q2: How is the gear module determined?

A: Module (common range 3–20) is governed by transmitted torque and tooth contact strength. You must also match the pinion's module, pressure angle, and profile shift coefficient. For the RKS.22.1091 that means M8, Z125, 20° pressure angle, X=0. Specifying only "internal gear" without these values makes accurate quotation impossible.

Q3: How flat does the mounting surface need to be?

A: Keep flatness deviation within 0.5 mm. Exceeding this can spike local contact pressure by approximately 300% above design values, causing early raceway spalling. Check with a feeler gauge or level before installation and clean all mating surfaces thoroughly.

Q4: What causes raceway spalling and pitting?

A: Common causes are: ① overload beyond rated capacity; ② mounting surface out-of-flat causing stress concentration; ③ lubrication failure (grease starvation or contamination); ④ insufficient raceway hardness. Once spalling starts, rolling elements accelerate the damage — replace the bearing promptly.

Q5: What is the difference between a slewing bearing and a slew drive?

A: A slewing bearing is a standalone bearing component requiring an external gearbox and pinion. A slew drive integrates a slewing bearing with a worm-gear reducer into one unit — common in solar trackers and elevating work platforms. If you need a complete rotary power unit, you want a slew drive; if you are building your own drive train, you want this bearing.

Q6: How do I choose the right seal type?

A: Match the seal to your environment: dry indoor use → standard NBR rubber seal; dusty or mining sites → heavy multi-lip seal; marine or port duty → labyrinth or multi-lip seal to block seawater-driven electrochemical corrosion; high-pressure washdown → wash-resistant seal design. Skimping on seals usually means paying for a new bearing much sooner.

Contact Us

Ready to get your RKS.22.1091 Slewing Bearings quote? Email us at mia@hgb-bearing.com — fast response guaranteed.