Bearings Name	New Model	Old Model:	ID(mm)	OD(mm)	Width(mm)	Cr(kN)	Cor(kN)	Grease Lubrication Speed(r/min)	Oil Lubrication Speed(r/min)	Weight(kg)
Large diameter slewing bearings, Slewing Ring Bearings customized	010/011/013.25.315	010/011/013.25.315	222	408	70	-	-	-	-	100
China Largest 1500mm Diameter Slewing Bearing	013.30.500	-	398	602	80	-	-	-	-	85.000
Large Diameter Slewing Ring | High-Capacity Slewing Bearing Manufacturer	114.25.630	-	528	732	75	-	-	-	-	100.000

large diameter slewing ring – Precision Rotation for Heavy Machinery

A Large Diameter Slewing Ring, also known as a large‑size Slewing Bearing, is a high‑capacity rotational component designed for equipment where massive axial, radial, and moment loads must be supported with controlled, low‑friction movement.

Typically measuring from 1 m up to 6 m outer diameter, these bearings are widely used in cranes, excavators, offshore platforms, heavy transporters, wind turbines, and marine applications, where structural strength and precision alignment are critical.

As a professional Chinese slewing bearing manufacturer, we specialize in custom‑engineered large diameter slewing rings built to international standards — ensuring optimal performance, long service life, and maximum load safety.

Designed for the biggest jobs — built for accurate rotation under extreme load.

---

2. Key Characteristics

• ⚙️ Extra‑Large Size Capacity
  Manufactured in diameters up to 6000 mm, with custom hole patterns and gear configurations for all major industrial systems.

• 💪 Heavy Load Endurance
  Engineered to handle axial loads exceeding 15 000 kN and high overturning moments.

• 🧱 Robust Forged Steel Construction
  Rings made from 42CrMo or 50Mn alloy steel, tempered and quenched for superior mechanical strength.

• ⚡ High‑Precision Machining
  CNC lathe, large‑scale gear hobbing, and raceway grinding guarantee smooth, precise rotation even with large diameters.

• 🧰 Gear Options
  Available in internal gear, external gear, or gearless configurations with optional pinion drive.

• 🛡️ Long‑Life Durability
  Full hardening and sealing for use in harsh outdoor, marine, or dusty conditions.

• 🧠 Custom Design Flexibility
  Large‑scale capability with individual engineering for size, mounting, torque, and weight optimization.

Engineered for strength, precision, and long‑term performance — even at massive diameters.

---

3. Typical Technical Parameters

---

4. Structural Variants for Large Diameter Bearings

1. Single‑Row Four‑Point Contact ball slewing ring

• Simplified and economical design for large turntables and moderate‑load applications.

2. Cross‑roller slewing ring

• Compact and rigid, providing higher moment capacity — ideal for large positioning systems and offshore cranes.

3. Double‑Row Ball Slewing Ring

• Handles larger combined loads with improved axial stiffness — suited for heavy material‑handling and construction machinery.

4. Triple‑Row Roller Slewing Ring

• Ultimate heavy‑duty structure; separate raceways for each load component.
  Capable of supporting extreme moment and weight loads, common in ship cranes and mining excavators.

Choosing the correct structure depends on load direction, rotation frequency, and installation layout.

---

5. Manufacturing & Quality Assurance

Our large diameter slewing rings are produced on advanced large‑scale CNC machining centers, ensuring dimensional accuracy and flawless surface finish.

Manufacturing Highlights

• Precision forging and UT test of rings
• Heat treatment & induction hardening of raceways
• Gear hobbing and grinding inspection
• Coordinate Measuring Machine (CMM) dimensional verification
• Torque and no‑load running test for smooth rotation
• Complete inspection certificates and lifecycle records

Quality Standards

• ISO 9001 Certified
• ANSI/AGMA, JB/T2300, and DIN ISO Reflective Accuracy Ratings
• Load testing simulation using Finite Element Analysis (FEA)

Large size — zero compromise: every bearing undergoes comprehensive testing before delivery.

---

6. Applications

Our large diameter slewing rings are used in:

• 🏗️ Tower, Crawler & Port Cranes
  High moment and heavy‑load resistance for safe lifting operations.

• ⛏️ Mining & Bulk Material Machines
  Excavators, stackers, reclaimers, and bucket‑wheel machinery.

• 🌬️ Wind Energy Turbines
  Yaw and pitch bearings with specific corrosion and fatigue resistance requirements.

• 🚢 Marine & Offshore Equipment
  Offshore cranes, pipe‑laying vessels, and oil platform systems.

• ⚙️ Industrial Turntables & Rotating Platforms
  Large indexing machinery, manipulators, and rotating furnaces.

• 🧱 Heavy Transport & Engineering Systems
  Modular transporters and bridge erection machinery.

Wherever massive structures need controlled rotation, large diameter slewing rings deliver performance you can trust.

---

7. Customization Options

We offer full OEM and ODM support for customized large‑diameter slewing rings:

• Tailored gear design (module, pitch circle, and tooth profile)
• Custom bolt holes, flange patterns, and lubrication channels
• Material selection & surface treatment for corrosion protection
• Integration with electric or hydraulic slewing drives
• Reverse engineering from worn or imported parts (Rothe Erde®, SKF®, IMO®, Kaydon®, etc.)
• Design verification via 3D CAD and finite‑element simulation

Your dimension, load condition, and application data — our tailored design and precision manufacturing.

---

8. Why Choose Us

• 🏭 15 + Years experience in slewing bearing design and manufacturing
• ⚙️ Complete in‑house production line for forging, machining, heat treatment, and assembly
• 🧠 Engineering consultation and design optimization based on FEA
• 🌍 Global exports to 40 + countries with ABS/BV/DNV certifications
• 💰 Factory‑direct pricing — premium quality at competitive cost
• 🧾 Full QC documentation and traceability for every bearing

We don’t just build large bearings — we build reliability on a massive scale.

---

9. Frequently Asked Questions

Q1: What defines a “large diameter” slewing ring?
A: Typically, any slewing bearing with an outer diameter above 1000 mm — we produce up to 6000 mm OD.

Q2: Can you manufacture gearless versions?
A: Yes, we supply internal, external, or non‑geared options depending on drive configuration.

Q3: How do you ensure concentricity in large rings?
A: Our vertical CNC lathes and in‑house FEA verification maintain uniform machining tolerance across the entire diameter.

Q4: Can coatings be customized for marine or offshore use?
A: Yes, multiple surface protection options are available: zinc plating, epoxy coating, nickel alloy, or spray metal.

Q5: What is the lead time for large bearings?
A: Standard designs: 35 – 55 days; complex or custom types: 60 – 75 days.

---

10. Summary

Our Large Diameter Slewing Rings combine high structural integrity, precise machining, and tested reliability for the world’s toughest rotational systems.
Every product is backed by years of design experience and proven performance in global heavy industries.

Stable rotation at any scale. Precision engineering without compromise.
Partner with a trusted Chinese manufacturer for your next large‑diameter slewing ring project.