Large Bearing 121.32.3750.990.41.1502 Ball and Roller Bearing Made in China

Product Description

Large Bearing 121.32.3750.990.41.1502 Ball And Roller Bearing Made In China 

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.

Related Slewing Bearing

Four-point contact ball slewing turntable bearings
consist of two ring seats. Compact structure, light weight, steel ball and arc track contact at four points, can bear axial force, radial force and overturning moment at the same time, has strong dynamic load.

Single row cross roller slewing bearing
Composed of two or three rings. compact structure, light weight, high manufacturing accuracy, small assembly gap and high requirement for installation accuracy. Rollers are 1:1 cross-arranged.
Can be bear axial force, overturning moment and large radial force at the same time,and widely used in lifting transportation, construction machinery and precesion products.

Double row ball slewing bearings
This kind of bearings can support high static loads with simple structures. They are mainly used in situations with variation load position and direction and continuously rotating. Main applications of this kind of bearings are deck hoisting, mining and material handling etc.

Three row roller slewing bearing
Three row roller bearing able to bear all kinds of loads at the same time, it is the largest one of the four structural products with large axle and radial dimensions and firm structure. Especially suitable for heavy machinery requiring larger diameter, such as bucket wheel stacker and reclaimer, wheel crane, marine crane, port crane, ladle turret,large tonnage truck crane,heavy machinery and so on.

DrawingNo. DL [mm]	[kg]	D. [mm]	[mm	H [mm]	L [mm	[mm]	Number of bolt holes	hole cirde	B Bo holediameter	M [mm]	Number of grease	ana  sad  sapddu	0 [mm	[mm]	H [mm	H [mm	Distance at bottom	H	H. mm		d [mm]	m [mm]
							n										[mm]
121.32.3550.990.41.1502	2028	3772.8	3358	159	3638	3418	76		30	27	10		3597	3509	109	143	16		50		3712	16
121.32.3750.990.41.1502	2186	3980.8	3558	159	3846	3618	80		30	27	10		3797	3709	109	143	16		50		3936	16
121.32.4000.990.41.1502	2278	4220.8	3808	159	4086	3868	84		30	27	12		4047	3959	109	143	16		50		4176	16
121.32.4250.990.41.1502	2455	4476.8	4058	159	4342	4118	90		30	27	12		4297	4209	109	143	16		50		4416	16

 

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.

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.