42CrMo Material Slewing Ring Bearing 121.40.5300.990.41.1502 Large Bearing with External Gear

Product Description

42CrMo Material Slewing Ring Bearing 121.40.5300.990.41.1502 Large Bearing With External Gear

Product Description

The 121 Series represents the pinnacle of large-diameter slewing bearing technology. Engineered for the most demanding applications where extreme loads, massive dimensions, and uncompromising reliability are non-negotiable, these bearings are designed for machines that shape industries-from towering port cranes to massive tunnel borers.

Combining advanced engineering expertise with cutting-edge material science, the 121 Series delivers rotational precision on a monumental scale.

Design Philosophy: Engineered for Extremes

Unlike standard rolling element bearings, the 121 Series is designed as a complete structural component. Its robust construction allows it to simultaneously handle immense axial, radial, and tilting moment loads, effectively replacing complex multi-bearing arrangements.

1. Large-Scale Dimensions

The 121 Series is defined by its ability to maintain precision at scale.

• Diameter Range: Typically available from 1000 mm to over 6000 mm (up to 6 meters+), making them suitable for the world's largest heavy machinery.

• Cross-Section: Features an optimized, robust cross-section that maximizes stiffness while managing the overall weight of the bearing, a critical factor in mobile equipment design.

2. Optimized Raceway Geometry

The core strength of the 121 Series lies in its internal geometry.

• Four-Point Contact: Standard designs utilize a four-point contact system, where the balls contact the raceway at four distinct points. This provides exceptional stability and allows a single-row bearing to manage moment loads effectively.

• Load Distribution: Advanced computer modeling ensures optimal load distribution across the raceway, minimizing stress concentrations and extending service life even under high dynamic loads.

3. Material & Heat Treatment

The 121 Series places a heavy emphasis on metallurgical quality.

• Through-Hardened Raceways: The raceways are induction hardened to a precise depth, creating a wear-resistant surface capable of withstanding millions of rotations under load, while retaining a tough, ductile core to absorb shock loads.

• High-Purity Steels: Manufactured using high-purity alloys to eliminate inclusions that could lead to premature fatigue failure in critical applications.

Gearing & Drive Integration

For large-scale applications requiring controlled rotation, the 121 Series offers flexible gearing options:

• External & Internal Gearing: Available with fully integrated gearing cut directly into the race ring (typically on the inner or outer ring).

• High-Precision Teeth: Gears are manufactured to high precision standards, ensuring smooth engagement with drive pinions and minimizing backlash. This is essential for precise positioning in applications like radar antennas or large excavators.

• Customizable Modules: Gear teeth can be customized in module and number of teeth to suit specific drive torque requirements and pinion configurations.

Sealing Systems: Protection in Harsh Environments

Large bearings often operate in some of the dirtiest environments on earth-mines, construction sites, and offshore platforms. The 121 Series features advanced sealing technology:

• Heavy-Duty Seals: Equipped with durable, wear-resistant seals (often labyrinth or multi-lip designs) that provide a tight barrier against contaminants such as dust, sand, water jets, and concrete slurry.

• Lubrication Retention: The sealing system is designed to retain grease effectively, ensuring a continuous lubricating film across the raceways and gear teeth, which is vital for reducing wear.

Key Applications

The sheer size and load capacity of the 121 Series make it the preferred choice for large-scale original equipment manufacturers (OEMs) and heavy industries:

• Material Handling: Ship-to-shore cranes, stacker/reclaimers, and heavy-duty port unloaders.

• Construction & Mining: Large walking draglines, electric rope shovels, and tunnel boring machines (TBMs).

• Renewable Energy: Onshore and offshore wind turbines (pitch and yaw bearings).

• Industrial Equipment: Large-diameter welding positioners, heavy-duty turntables, and ladle turrets in steel mills.

• Defense & Aerospace: Large radar antennas and missile launcher systems.

Quality & Service Life

Every 121 Series bearing undergoes rigorous quality control, including 100% non-destructive testing of raceways. This commitment to quality translates into:

• Extended Maintenance Intervals: Designed for low maintenance with optimized re-lubrication features.

• High Operational Reliability: Reduces the risk of unplanned downtime in continuous operation processes.

• Long-Term Support: As a globally recognized solution, comprehensive after-sales service is available, including reconditioning, inspection, and spare parts support for decades after the initial purchase.
  

  Type		Weight [KG]	Da   [mm]	Di [mm]	H [mm]		La[mm]	Li[mm]	n		B [mm]	M [mm]	n1		o  [mm]	U  [mm]	H1 [mm]	H2 [mm]	Ho [mm]		Hu [mm]		d	m	z
  121.40.4500.990.41.1502		3673	4776	4276	183		4612	4348	72		36	33	14		4556	4450	133	167	16		50		4720	20	236
  121.40.4750.990.41.1502		3796	5016	4526	183		4852	4598	76		36	33	14		4806	4700	133	167	16		50		4960	20	248
  121.40.5000.990.41.1502		4082	5276	4776	183		5112	4848	80		36	33	16		5056	4950	133	167	16		50		5220	20	261
  121.40.5300.990.41.1502		4329	5576	5076	183		5412	5148	84		36	33	16		5356	5250	133	167	16		50		5520	20	276

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Detailed Photos

 

Product Process

Product Process

Application

Application:

- Excavators - Drilling rigs - Mining Equipments - Cranes   -Offshore Equipments  - Vehicles  - Machine Tools  - Wind Turbines

Company Profile

 

About Us:
Luoyang MC Bearing Technology Co.,Ltd (LYMC),who is manufacture located in bearing zone, focus on Slewing bearing, cross roller bearing and pinion,Dia from 50mm-8000mm, Our team with technical and full experience in the bearing industry.
*Professional in researching, developing, producing & marketing high precision bearings for 16 years;
*Many series bearings are on stock; Factory directly provide, most competitive price;
*Advanced CNC equipment, guarantee product accuracy & stability;
*One stop purchasing, product include cross roller bearing, rotary table bearing, robotic bearing, slewing bearing, angular contact ball bearing, large and extra large custom made bearing, diameter from 50~9000mm;
*Excellent pre-sale & after sale service. We can go to customers' project site if needed.
*Professional technical & exporting team ensure excellent product design, quotation, delivering, documentation & custom clearance.
 

After Sales Service

Our Service:

FAQ:
1.Q: Are you trading company or manufacturer ?
A: We are professional slewing bearing manufacturer with 20 years' experience.
2.Q: How long is your delivery time?
A: Generally it is 4-5 days if the goods are in stock. or it is 45 days if the goods are not in
stock, Also it is according to quantity.
3.Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample, it is extra.
4.Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance, balance before shipment.
5.Q: Can you provide special customization according to the working conditions?
A: Sure, we can design and produce the slewing bearings for different working conditions.
6.Q: How about your guarantee?
A: We provide lifelong after-sales technical service.