SWBTEC
Large Diameter Turntable Bearings
Designed for heavy working conditions of large diameter slewing bearings, 42CrMo forging material, with excellent axial force, radial force and overturning torque combined bearing capacity, to ensure that large mechanical equipment in extreme environments to achieve smooth high-precision rotation, support bulk procurement.
Large Diameter Turntable Bearings core parameters
1-6 meters
Outer diameter range:
55-62HRC
Raceway hardness:
ISO 8
Gear accuracy:
Large Diameter Turntable Bearings Features
Extend service life under high frequency operation
Using medium frequency induction hardening technology, the raceway surface hardness is controlled at 55-62 HRC, and the effective hardening layer depth reaches 4mm-6mm. Compared with ordinary shallow quenching, this depth treatment improves the anti-spalling ability by 40%, and significantly prolongs the service life under high frequency rotation operation.
No brittle fracture of bearing matrix
The 42CrMo4 or 50Mn high-grade alloy steel forgings are selected, and the tensile strength reaches 900 MPa – 1100 MPa after tempering treatment. Strictly control the non-metallic inclusions in the steel to ensure that the bearing matrix will not undergo brittle fracture when subjected to impact loads of thousands of tons.
Reduced impact wear at start-up
The gear machining accuracy reaches ISO Grade 7-8, and the surface roughness is reduced to Ra 3.2 through the tooth surface grinding process. With the optimized tooth side clearance design of 0.15 mm-0 mm, the impact wear during starting is effectively reduced, and the gear transmission efficiency is kept above 98%.
Block sand, dust and moisture intrusion
Equipped with ageing-resistant NBR (nitrile rubber) or HNBR double-lip seals in the temperature range from -30°C to +120°C. The special labyrinth structure can effectively block sand, dust and moisture intrusion, and the protection level is equivalent to IP65, which greatly reduces the risk of raceway failure caused by grease contaminatio
Super anti-overturning moment ability
Through finite element analysis (FEA) optimization of the raceway contact angle design, the large Diameter Turntable Bearings has a static safety factor of 1.5 times. Even under the maximum extension arm condition, it can withstand the instantaneous overturning moment exceeding 120% of the rated value without plastic deformation.
100% NDT
100% ultrasonic (UT) and magnetic particle (MT) inspection shall be carried out on welds and forgings before delivery to ensure that there are no cracks, pores or white spots. It complies with EN 10204 3.1 certification standards and provides traceable quality inspection reports for key engineering projects.
Large Diameter Turntable Bearings Technical Specifications Table
| Parameter item | Technical Specifications |
| Product Name | Large Diameter Turntable Bearings |
| Structural form | Single row four-point contact ball / Double row ball / Three row roller ball / Cross roller ball |
| Diameter Range | ID: 800mm – OD: 6500mm |
| Material | 42CrMo4 / 50Mn / C45 (Ring); GCr15 (Rolling Elements) |
| Raceway Hardness | 55 – 62 HRC (Induction Hardened) |
| Soft Zone processing | Marked with an “S” and equipped with a plug, it must be installed in a non-load-bearing area. |
| Gear Type | Toothless / External / Internal |
| Gear Precision | ISO 1328 Grade 8 – 10 |
| Seal Material | NBR / Viton (high temperature resistant optional) / HNBR |
| Lubricating grease | Extreme pressure lithium-based grease (EP2) or as specified by the customer. |
| Operating temperature | -40°C ~ +80°C (Standard); -50°C ~ +150°C (Customized) |
| Tolerance grade | IT7 – IT8 |
Large Diameter Turntable Bearings comparison point
Compared with the traditional split bearing combination, this Large Diameter Turntable Bearings integrates the inner ring, outer ring and rolling element into one, which reduces the installation space by 50% and eliminates the influence of multi-component cumulative tolerance on rotation accuracy. Especially in large diameter (>2 m) applications, our integral ring forging process avoids the common stress concentration problems of welded splice rings, and the structural rigidity is increased by 30%.
Addressing the risk of downtime caused by broken teeth
In view of the common tooth root fracture problem of excavators or stacker-reclaimers, we have carried out a full fillet transition treatment on the tooth root and implemented shot peening to eliminate the stress concentration point, so that the bending fatigue limit of the tooth root is increased to more than 450 MPa.
Overcome seal failure in harsh dust environments
In view of the mine and port environment, the common sealing strip is easy to age and crack. We use the 3 lip wear-resistant sealing structure with UV-resistant rubber, in the continuous operation test, effectively prevent 99% of the micron dust into the raceway.
Solve jams caused by uneven installation surface of large diameter
In view of the problem that the machined surface of large equipment is difficult to level, we have introduced the calculation of adaptive elastic deformation in the bearing design, allowing the flatness error of 0.1mm/1000mm on the mounting surface, which can still ensure smooth rotation without jamming.
Large Diameter Turntable Bearings Applicable Crowd
Port crane manufacturer
Suitable for quayside bridge, portal crane and other equipment. This type of user needs Large Diameter Turntable Bearings withstand huge overturning moments and salt spray corrosion. Our multi-layer anti-corrosion coating and heavy-duty design perfectly meet the needs of 24-hour continuous operation.
Wind power equipment operators
Pitch and yaw systems for megawatt wind turbines. Our products provide precise zero clearance or negative clearance selection, ensuring the accuracy of blade angle adjustment under gust impact, and the design life of up to 20 years, reducing the cost of high-altitude replacement.
Integrator of tunnel boring machine (shield machine)
Suitable for shield machine cutter head drive and segment erection machine. This scenario requires the bearing to work under extremely high pressure and muddy water. Our three-row roller construction provides the industry’s best axial capacity and is equipped with a reinforced mud-proof water seal system.
The purchaser of excavation equipment for open-pit mines.
For large front shovel/backhoe excavators and stacker-reclaimers. Such users are most concerned about impact resistance and abrasion resistance. Our surface hardened gears and deepened hardened raceway can effectively resist severe vibration and instantaneous overload during ore mining.
Large Diameter Turntable Bearings instructions
FAQ and Contact Us
Get a Free Quote Today.
Our factory
We can design and manufacture segmented or integral slewing bearings with an outer diameter of up to 6,000mm (6 m). For oversized sizes that exceed shipping limits, we offer segmented manufacturing solutions with on-site precision assembly guidance.
We follow ISO 281 standards and Lundberg-Palmgren fatigue theory. Please provide your axial load, radial load, overturning moment and working speed. Our engineers will calculate the L10 life report through professional software for your reference.
For models within the standard forging inventory range (diameter <2.5 m), the delivery time is usually 35-45 days. For special custom materials or oversized diameters (> 3 meters), the lead time is usually 60-90 days due to the forging and heat treatment cycle involved.
If the gear surface is only slightly worn, it can be repaired by tooth profile modification. However, if the raceway is peeled off or the tooth root is broken, it must be replaced for safety reasons. We provide remanufacturing assessment services for old bearings to determine if they are of repair value.
The applicable temperature of the standard product is -20°C to +80°C. For environments below -40°C such as polar or cold storage, we will use special low-temperature impact toughness steel (such as 42CrMo4 low-temperature modified steel) and special low-temperature grease.
Each shipment provides a complete quality data package, including: material warranty (MTC), heat treatment hardness test report, ultrasonic flaw detection (UT) report, gear accuracy test report and finished product size inspection report.
Large Diameter Turntable Bearings
Designed for heavy working conditions of large diameter slewing bearings, 42CrMo forging material, with excellent axial force, radial force and overturning torque combined bearing capacity, to ensure that large mechanical equipment in extreme environments to achieve smooth high-precision rotation, support bulk procurement.
Outer diameter range:
1-6 meters
Raceway hardness:
55-62HRC
Gear accuracy:
ISO 8
Large Diameter Turntable Bearings Features
Extend service life under high frequency operation
Using medium frequency induction hardening technology, the raceway surface hardness is controlled at 55-62 HRC, and the effective hardening layer depth reaches 4mm-6mm. Compared with ordinary shallow quenching, this depth treatment improves the anti-spalling ability by 40%, and significantly prolongs the service life under high frequency rotation operation.
No brittle fracture of bearing matrix
The 42CrMo4 or 50Mn high-grade alloy steel forgings are selected, and the tensile strength reaches 900 MPa – 1100 MPa after tempering treatment. Strictly control the non-metallic inclusions in the steel to ensure that the bearing matrix will not undergo brittle fracture when subjected to impact loads of thousands of tons.
Reduced impact wear at start-up
The gear machining accuracy reaches ISO Grade 7-8, and the surface roughness is reduced to Ra 3.2 through the tooth surface grinding process. With the optimized tooth side clearance design of 0.15 mm-0 mm, the impact wear during starting is effectively reduced, and the gear transmission efficiency is kept above 98%.
Block sand, dust and moisture intrusion
Equipped with ageing-resistant NBR (nitrile rubber) or HNBR double-lip seals in the temperature range from -30°C to +120°C. The special labyrinth structure can effectively block sand, dust and moisture intrusion, and the protection level is equivalent to IP65, which greatly reduces the risk of raceway failure caused by grease contamination.
Super anti-overturning moment ability
Through finite element analysis (FEA) optimization of the raceway contact angle design, the large Diameter Turntable Bearings has a static safety factor of 1.5 times. Even under the maximum extension arm condition, it can withstand the instantaneous overturning moment exceeding 120% of the rated value without plastic deformation.
100% NDT
100% ultrasonic (UT) and magnetic particle (MT) inspection shall be carried out on welds and forgings before delivery to ensure that there are no cracks, pores or white spots. It complies with EN 10204 3.1 certification standards and provides traceable quality inspection reports for key engineering projects.
Large Diameter Turntable Bearings Technical Specifications Table
| Parameter item | Technical Specifications |
| Product Name | Large Diameter Turntable Bearings |
| Structural form | Single row four-point contact ball / Double row ball / Three row roller ball / Cross roller ball |
| Diameter Range | ID: 800mm – OD: 6500mm |
| Material | 42CrMo4 / 50Mn / C45 (Ring); GCr15 (Rolling Elements) |
| Raceway Hardness | 55 – 62 HRC (Induction Hardened) |
| Soft Zone processing | Marked with an “S” and equipped with a plug, it must be installed in a non-load-bearing area. |
| Gear Type | Toothless / External / Internal |
| Gear Precision | ISO 1328 Grade 8 – 10 |
| Seal Material | NBR / Viton (high temperature resistant optional) / HNBR |
| Lubricating grease | Extreme pressure lithium-based grease (EP2) or as specified by the customer. |
| Operating temperature | -40°C ~ +80°C (Standard); -50°C ~ +150°C (Customized) |
| Tolerance grade | IT7 – IT8 |
Large Diameter Turntable Bearings comparison point
Compared with the traditional split bearing combination, this Large Diameter Turntable Bearings integrates the inner ring, outer ring and rolling element into one, which reduces the installation space by 50% and eliminates the influence of multi-component cumulative tolerance on rotation accuracy. Especially in large diameter (>2 m) applications, our integral ring forging process avoids the common stress concentration problems of welded splice rings, and the structural rigidity is increased by 30%.
In addition, for heavy-duty applications, we have adopted a special negative clearance pretension technology. Compared with ordinary zero-clearance products, this design can maintain continuous contact between the raceway and the rolling element under high or partial load conditions, effectively prevent fretting wear, and increase the theoretical fatigue life of the bearing by 1.8 times.
Addressing the risk of downtime caused by broken teeth
In view of the common tooth root fracture problem of excavators or stacker-reclaimers, we have carried out a full fillet transition treatment on the tooth root and implemented shot peening to eliminate the stress concentration point, so that the bending fatigue limit of the tooth root is increased to more than 450 MPa.
Overcome seal failure in harsh dust environments
In view of the mine and port environment, the common sealing strip is easy to age and crack. We use the 3 lip wear-resistant sealing structure with UV-resistant rubber, in the continuous operation test, effectively prevent 99% of the micron dust into the raceway.
Solve jams caused by uneven installation surface of large diameter
In view of the problem that the machined surface of large equipment is difficult to level, we have introduced the calculation of adaptive elastic deformation in the bearing design, allowing the flatness error of 0.1mm/1000mm on the mounting surface, which can still ensure smooth rotation without jamming.
Large Diameter Turntable Bearings Applicable Crowd
Port crane manufacturer
Suitable for quayside bridge, portal crane and other equipment. This type of user needs Large Diameter Turntable Bearings withstand huge overturning moments and salt spray corrosion. Our multi-layer anti-corrosion coating and heavy-duty design perfectly meet the needs of 24-hour continuous operation.
Wind power equipment operators
Pitch and yaw systems for megawatt wind turbines. Our products provide precise zero clearance or negative clearance selection, ensuring the accuracy of blade angle adjustment under gust impact, and the design life of up to 20 years, reducing the cost of high-altitude replacement.
Integrator of tunnel boring machine (shield machine)
Suitable for shield machine cutter head drive and segment erection machine. This scenario requires the bearing to work under extremely high pressure and muddy water. Our three-row roller construction provides the industry’s best axial capacity and is equipped with a reinforced mud-proof water seal system.
The purchaser of excavation equipment for open-pit mines.
For large front shovel/backhoe excavators and stacker-reclaimers. Such users are most concerned about impact resistance and abrasion resistance. Our surface hardened gears and deepened hardened raceway can effectively resist severe vibration and instantaneous overload during ore mining.
Large Diameter Turntable Bearings instructions
FAQ and Contact Us
Get a Free Quote Today.
We can design and manufacture segmented or integral slewing bearings with an outer diameter of up to 6,000mm (6 m). For oversized sizes that exceed shipping limits, we offer segmented manufacturing solutions with on-site precision assembly guidance.
We follow ISO 281 standards and Lundberg-Palmgren fatigue theory. Please provide your axial load, radial load, overturning moment and working speed. Our engineers will calculate the L10 life report through professional software for your reference.
For models within the standard forging inventory range (diameter <2.5 m), the delivery time is usually 35-45 days. For special custom materials or oversized diameters (> 3 meters), the lead time is usually 60-90 days due to the forging and heat treatment cycle involved.
If the gear surface is only slightly worn, it can be repaired by tooth profile modification. However, if the raceway is peeled off or the tooth root is broken, it must be replaced for safety reasons. We provide remanufacturing assessment services for old bearings to determine if they are of repair value.
The applicable temperature of the standard product is -20°C to +80°C. For environments below -40°C such as polar or cold storage, we will use special low-temperature impact toughness steel (such as 42CrMo4 low-temperature modified steel) and special low-temperature grease.
Each shipment provides a complete quality data package, including: material warranty (MTC), heat treatment hardness test report, ultrasonic flaw detection (UT) report, gear accuracy test report and finished product size inspection report.
