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Home > Industrial Equipment & Components > Bearing > Slewing Bearing > Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane thumbnail-3

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane thumbnail-4

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane thumbnail-5

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane photo-1

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane photo-2

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane photo-3

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane photo-4

Slewing Bearing With Internal Gear, 1.2m OD, 50Mn Steel, Hardened to 55HRC, 4-point Contact, for Tower Crane photo-5

Product Spotlights

Precision 4-point contact slewing bearing with internal gear, 1.2m OD, made from hardened 50Mn steel (55HRC). Designed for tower crane durability and load capacity. Customizable, ISO9001 certified, backed by 10+ years of manufacturing expertise and global export experience.

US$ 1000 ≥1 Piece

Key Specifications

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Material:

Other, 50Mn steel

Type:

Other, Internal gear

Hardness:

55HRC

Contact Supplier Request Quote Chat Now

Henan San Kuang Machinery Technology Co., Ltd.

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

qingdao|tianjin

Delivery Detail:

30 days

Product Details
Company Profile
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Material Other, 50Mn steel

Type Other, Internal gear

Hardness 55HRC

Outer Diameter 1.2m

Contact 4-point contact

Application Tower crane

Heat Treatment Hardened

Gear Type Internal

Henan San Kuang Machinery Technology Co., Ltd., established in 2014, proudly presents our high-performance slewing bearing with internal gear, designed specifically for tower crane applications. With a 1.2m outer diameter, crafted from premium 50Mn steel and hardened to 55HRC, this 4-point contact bearing delivers exceptional load capacity, durability, and precision. Our factory, spanning 10,000–30,000 square meters, and a team of 51–100 skilled employees ensure every unit meets rigorous quality standards. We leverage years of export experience (annual export value US$2.5–5 million) to serve global markets, making this bearing a reliable choice for demanding construction environments.

Product Features & Technical Specifications:

Material Excellence: 50Mn steel offers superior wear resistance, toughness, and weldability, ideal for heavy-duty cyclic loads.
Precision Hardening: Hardened to 55HRC (Rockwell C scale) ensures extended service life and resistance to surface fatigue under high pressure.
4-Point Contact Design: The bearing raceway geometry allows simultaneous load distribution in multiple directions, supporting axial, radial, and moment loads effectively.
Internal Gear Integration: The internal gear teeth are precisely machined for smooth engagement with the drive pinion, reducing backlash and vibration.
Diameter and Capacity: With a 1.2m outer diameter, this bearing is optimized for medium to large tower cranes, providing stable rotation for slewing movements.
Heat Treatment Consistency: Through-hardening process ensures uniform hardness across the entire raceway, preventing localized deformation.
Sealing Options: Available with optional seals to protect against dust, moisture, and debris, prolonging maintenance intervals.
Customizable Bore and Mounting: Bolt hole patterns and internal bore dimensions can be tailored to customer specifications.

Parameter	Value
Outer Diameter	1.2 m (1200 mm)
Material	50Mn Steel
Hardness	55 HRC (minimum)
Contact Type	4-Point Contact
Gear Type	Internal Spur Gear
Application	Tower Crane
Heat Treatment	Through-hardening
Raceway Hardness Depth	≥ 3 mm (customizable)

Customer Benefits:

Enhanced Safety: The 4-point contact design and high hardness reduce the risk of catastrophic failure, crucial for tower crane operations.
Low Maintenance: Durable materials and precise heat treatment minimize wear, extending service intervals and reducing downtime.
Smooth Rotation: Internal gear teeth are hobbed with high accuracy, ensuring quiet and smooth slewing motion even under heavy loads.
Cost Efficiency: Longer lifespan and reliability translate to lower total cost of ownership for crane owners.
Global Compatibility: Designed to meet international standards, our bearing can be integrated into tower cranes from various manufacturers.

Why Choose Henan San Kuang Machinery Technology Co., Ltd.?

Since 2014, we have grown into a trusted manufacturer with a modern factory of 10,000–30,000 m² and an annual export value of US$2.5–5 million. Our products are shipped from major ports including Shanghai, Lianyungang, Qingdao, and Tianjin to markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. We hold multiple certifications such as ISO9001, ISO14000, and OHSAS18001, demonstrating our commitment to quality, environmental management, and occupational health. Our team of 51–100 experienced professionals ensures every slewing bearing undergoes rigorous inspection before delivery. Contact us today for a quote or technical consultation – we are ready to support your tower crane projects with reliable slewing solutions.

Frequently Asked Questions (FAQ)

Q: What is the maximum load capacity of this slewing bearing?
A: The load capacity depends on the application and mounting configuration. For a 1.2m OD, 4-point contact bearing with 50Mn steel, the typical dynamic axial load rating is approximately 800–1200 kN. Please contact our engineers with your specific load requirements for a precise calculation.
Q: Can this bearing be used in other types of cranes besides tower cranes?
A: Yes, while optimized for tower cranes, its design is suitable for other rotating equipment such as ship cranes, mobile cranes, and excavators, provided the load and speed conditions match.
Q: What is the delivery time for a custom order?
A: Standard lead time is 30–45 days after order confirmation. Custom dimensions or special hardening requirements may extend the lead time to 60 days. We offer expedited shipping options upon request.
Q: Do you provide installation instructions or technical support?
A: Yes, we provide detailed installation manuals and technical support via email or video call. Our team can assist with mounting, alignment, and lubrication guidelines.
Q: What is the warranty period for this slewing bearing?
A: We offer a 12-month warranty from the date of shipment against manufacturing defects. Extended warranty options are available for an additional cost.
Q: Can you supply the bearing with a pre-lubrication or special sealing?
A: Yes, we can supply with grease-filled and sealed units. Options include labyrinth seals, rubber lip seals, or metal shields – all customizable to your operating environment.
Q: Is the 50Mn steel susceptible to corrosion in coastal environments?
A: 50Mn steel has limited corrosion resistance. For coastal or humid environments, we recommend applying a protective coating (e.g., zinc plating or epoxy paint) during manufacturing. We can also supply bearings made from stainless steel or with corrosion-resistant treatments upon request.
Q: How do you ensure the hardness of 55HRC is consistent across the raceway?
A: We use controlled furnace heat treatment with real-time temperature monitoring and post-hardening hardness testing at multiple points. Each batch is documented with a traceable report.