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What is a Double Row Tapered Roller Bearing?

A Double Row Tapered Roller Bearing (DRTRB) is a robust, high-load industrial bearing with two symmetrically arranged rows of tapered rollers, engineered to simultaneously handle heavy radial loads and significant bidirectional axial loads, as well as overturning moments. It is available in common TDO (Double Outer Ring) and TDI (Double Inner Ring) configurations, with optional integral or separable inner/outer ring structures to suit diverse assembly needs. Designed for exceptional rigidity, shock resistance, and load stability, this bearing is an ideal core component for heavy-duty applications such as rolling mills, mining machinery, gearboxes, and wind energy equipment, where combined loads and harsh working conditions are prevalent.

1. Features of Double Row Tapered Roller Bearing

Double Row Tapered Roller Bearings stand out in heavy industrial applications due to their optimized structural design and industry-leading performance advantages, with core features as follows:

Ultra-High Comprehensive Load-Bearing Capacity: Adopting a double row line contact design with matched taper angles, the bearing delivers radial load capacity 1.8-2.5 times higher than single row tapered roller bearings of the same size, with a maximum radial load rating of up to 5000 kN. Its tapered structure enables it to bear bidirectional axial loads equivalent to 50%-80% of its radial load capacity, eliminating the need for additional thrust bearings and simplifying equipment structure. The full-complement variant further enhances load capacity for ultra-heavy load, low-speed scenarios.

Integrated Bidirectional Axial Load & Overturning Moment Resistance: The symmetrical double row tapered roller layout and matched raceway taper angles ensure the extended contact lines of rollers intersect at a common point on the bearing axis, forming a stable load transfer path. This design allows the bearing to directly withstand bidirectional axial loads and complex overturning moments without paired installation, greatly simplifying equipment design, reducing assembly complexity, and cutting overall system costs.

High Rigidity & Superior Shock Resistance: The integral ring structure and optimized roller distribution deliver exceptional deformation resistance, enabling the bearing to withstand frequent start-stop shocks and fluctuating heavy loads without precision loss. Precision ground raceways and rollers ensure uniform load distribution across all rollers, minimizing stress concentration and maintaining outstanding operational stability even in harsh, vibration-heavy working environments.

Long Service Life & Stable Performance: Bearing rings and rollers are primarily manufactured from GCr15 high-carbon chromium steel, with SUS440C stainless steel available for corrosive environments. Advanced surface hardening treatment and precision polishing of roller end faces (surface roughness Ra≤0.08μm) reduce friction and wear, extending fatigue life by 40% compared to conventional bearings. This ensures reliable, long-term continuous operation even under sustained heavy loads.

Flexible Installation & Easy Maintenance: Multiple models feature a separable inner/outer ring design, allowing independent mounting and disassembly of the rings without dismantling the entire host equipment. This reduces assembly difficulty and maintenance downtime by over 50%, making it particularly suitable for large-scale machinery where integral disassembly is impractical, such as rolling mill stands and heavy gearboxes.

Wide Working Condition Adaptability & Customization Options: With flexible sealing, lubrication, and material configurations, the bearing adapts to diverse complex environments including clean, dusty, high-temperature, and corrosive conditions. It supports full-range customization: non-standard size (inner diameter, outer diameter, width) adjustment, contact angle optimization (15° for high speed, 25°/30° for heavy load), corrosion-resistant material modification, seal type upgrade, and cage material customization to meet unique application requirements.

2.Applications of Double Row Tapered Roller Bearing

Leveraging its exceptional comprehensive load capacity, high rigidity, and harsh environment adaptability, Double Row Tapered Roller Bearings are widely used across 10 key industrial fields, becoming an indispensable core component in heavy-duty rotating machinery:

Automotive & Transportation: Applied to truck and bus wheel hubs, railway axle boxes, and heavy-duty vehicle transmissions, they reliably handle the combined radial, axial loads and impact shocks encountered during braking, cornering, and acceleration, ensuring long-term driving safety and stability.

Gearboxes & Speed Reducers: Integrated into industrial heavy-duty gearboxes, marine gear systems, and wind turbine gear units, they withstand the large radial and bidirectional axial forces generated by gear meshing, maintain precise shaft alignment, reduce transmission vibration and noise, and extend the service life of the transmission system.

Construction Machinery: Installed in excavators, wheel loaders, cranes, and roadheader equipment, these bearings deliver robust performance under heavy, fluctuating loads and harsh outdoor working conditions, providing stable support for the rotating mechanisms of construction equipment.

Mining & Quarry Equipment: A core component in crushers, belt conveyors, ball mills, and mining grinding mills, they are designed to withstand extreme radial and axial loads, severe vibration, and dusty, contaminated operating environments, reducing maintenance frequency and downtime in mining operations.

Steel & Metallurgical Equipment: Widely used in rolling mill work rolls, backup rolls, continuous casting machines, and steel processing lines, their ultra-high load capacity and rigidity are essential for maintaining rolling dimensional accuracy and long-term durability under the extreme loads and high temperatures of steel production.

Wind Energy Equipment: Applied to wind turbine main shafts, gearbox input/output shafts, and yaw systems, they support heavy radial and bidirectional axial loads from wind impact, deliver excellent fatigue resistance, and meet the long service life requirements of onshore and offshore wind farms.

Marine & Offshore Equipment: Used in ship propulsion systems, offshore platform winches, and deck machinery, they provide excellent load handling capacity and corrosion resistance options, ensuring reliable operation in the humid, corrosive, and high-load marine environment.

Heavy-Duty Machine Tools: Integrated into large machining center spindles, rotary tables, and indexing heads, they maintain high rigidity and rotational precision under heavy cutting forces, ensuring consistent machining accuracy for heavy-duty metalworking operations.

Agricultural Machinery: Equipped in large tractors, combine harvesters, and heavy tillage equipment, they withstand high loads, shock impacts, and contamination in field operations, delivering reliable performance with minimal maintenance requirements.

Industrial Fans & Heavy Rotating Equipment: Used in large industrial blowers, cooling fans, and industrial mixers, they provide stable shaft support under combined radial and axial loads, ensuring smooth, low-vibration operation of rotating equipment over long continuous running cycles.

3. Factors Affecting the Price of Double Row Tapered Roller Bearing

The price of Double Row Tapered Roller Bearings is determined by multiple interrelated factors, primarily including product specifications, material quality, structural design, and order requirements, with detailed influencing factors as follows:

Size & Load Rating: Size is the core price driver, with standard models covering an inner diameter range of 150–1778 mm, outer diameter range of 210–2159 mm, and width range of 86–393.7 mm. Larger bearings consume significantly more raw material and require more complex precision machining and heat treatment processes, leading to higher production costs. Bearings with ultra-high load ratings (above 3000 kN) require thicker raceways, larger rollers, and reinforced structures, further increasing the final price.

Precision Grade: Precision grades are classified as P0, P6, P5, and P4 in ascending order of accuracy, which directly impacts pricing. High-precision P4/P5 grade bearings require stricter multi-stage grinding, 100% dimensional testing, and roller sorting processes, with a much higher production rejection rate. As a result, their prices are 40%-70% higher than standard P0 grade bearings, with a more significant price gap for ultra-large size models.

Material Selection: Standard GCr15 high-carbon chromium steel offers the best cost performance for general working conditions. Selecting SUS440C stainless steel for corrosion resistance or heat-resistant alloy materials for high-temperature environments will increase raw material costs by 50%-90%, directly driving up the bearing price. Cage material also affects pricing: machined brass cages are more expensive than Nylon 66 or stamped steel cages.

Structural Complexity & Customization: Integral structure bearings are the standard and most cost-effective option; separable inner/outer ring structures, TDO/TDI special configurations, and customized contact angle designs require higher machining precision, increasing costs by 15%-30%. Non-standard size customization, special raceway profile design, and added lubrication holes/grooves will add 30%-60% to the price based on the complexity of the customization.

Sealing & Lubrication Configuration: Open-type bearings are the most economical base option. Adding contact rubber seals (2RS/ZZ) for dust and splash protection increases costs by 15%-30%, while non-contact labyrinth seals for medium-high speed applications add 10%-20% to the price. Special lubrication solutions, such as high-temperature resistant grease, food-grade lubricant, or circulating oil lubrication designs, will also increase the overall product cost.

Order Quantity & Delivery Time: Bulk orders (≥100 pieces) qualify for a 15%-25% quantity discount, as mass production reduces unit processing costs and material waste. Small-batch orders (≤30 pieces) or urgent orders (delivery within 7 days) incur additional production scheduling, expedited processing, and logistics costs, increasing the unit price by 20%-40%.

4. What Factors Should Be Considered When Purchasing Double Row Tapered Roller Bearing

To select the optimal Double Row Tapered Roller Bearing and ensure long-term stable operation matching the equipment requirements, purchasers should comprehensively evaluate the following key factors:

Working Condition Matching: First, clarify the core working parameters of the equipment, including radial load, bidirectional axial load, overturning moment, rotational speed, working temperature, and environmental conditions (dusty, corrosive, humid). For example, high-speed applications require a 15° contact angle design, while heavy-load rolling mill applications need a 25°/30° contact angle and reinforced structure; corrosive marine environments require SUS440C stainless steel material and contact seal structures.

Size & Precision Grade Confirmation: Determine the inner diameter (d), outer diameter (D), and width (T) of the bearing strictly according to the equipment design drawings, and select the appropriate precision grade. For general heavy-duty equipment such as mining conveyors, P0/P6 grade bearings can meet the requirements; for precision equipment such as heavy machine tools and wind turbine gearboxes, P5/P4 high-precision bearings should be selected to ensure rotational accuracy and operational stability.

Material & Cage Selection: For standard room temperature, clean working conditions, GCr15 high-carbon chromium steel and stamped steel/Nylon 66 cages are sufficient and cost-effective. For high-temperature, corrosive, or heavy impact environments, select SUS440C stainless steel or heat-resistant alloy materials.

Cage selection should also match working conditions: Nylon 66 cages for medium-high speed operation, machined brass cages for heavy load and impact conditions, and stamped steel cages for cost-sensitive general applications.

Load & Speed Capacity Verification: Calculate the actual static and dynamic radial and axial loads of the equipment, and select bearings with basic load ratings 1.2–1.5 times higher than the actual working loads to ensure sufficient safety margin for shock loads. At the same time, verify that the limiting speed (grease or oil lubrication) of the selected bearing is higher than the maximum operating speed of the equipment, to avoid overheating and premature failure.

Supplier Qualification & After-Sales Service Assessment: Prioritize professional bearing suppliers with mature production capacity and industry experience, such as NewBee Transmission. Verify the supplier's ISO9001 quality certification, advanced production equipment (CNC precision grinding machines, heat treatment lines), and complete product testing reports. In addition, fully understand the supplier’s after-sales service capabilities, including warranty period, on-site installation guidance, and 24/7 technical support, to avoid after-sales troubles.

Cost-Effectiveness Balance: Avoid blind pursuit of ultra-high precision and premium materials that exceed actual working requirements. Select products that fully match the actual working conditions according to the importance of the equipment and operating requirements. Domestic brands such as NewBee Transmission provide technical specifications fully compatible with imported brands (e.g., SKF, Timken), with a cost advantage of 20%-30%, ensuring stable supply while significantly reducing procurement costs.

5.Supplier of Double Row Tapered Roller Bearing

NewBee Transmission is a professional manufacturer and supplier of high-quality Double Row Tapered Roller Bearings, focusing on providing reliable heavy-load bearing solutions for global customers in the steel, metallurgy, mining, wind energy, construction machinery, and marine industries. With advanced manufacturing technology, strict full-process quality control, and customer-centric professional services, NewBee Transmission has become a trusted long-term partner for many large industrial enterprises worldwide.

Comprehensive Product Range:The standard Double Row Tapered Roller Bearing series covers inner diameters from 150 mm to 1778 mm, outer diameters from 210 mm to 2159 mm, and widths from 86 mm to 393.7 mm, with precision grades including P0, P6, P5, and P4. It offers TDO, TDI, and other mainstream configurations, open-type and sealed designs, as well as cage-type and full-complement variants, fully meeting the diverse needs of different industrial applications. Non-standard size, material, and structural customization services are also available for special working conditions.

Advanced Manufacturing & Testing Capabilities: The company is equipped with internationally advanced CNC precision grinding machines, integral automatic heat treatment lines, high-precision roller sorting equipment, and professional bearing testing centers. It implements strict 100% inspection throughout the entire production process, from raw material incoming inspection (spectral analysis, metallographic testing) to finished product testing (load capacity, precision, noise, fatigue life), ensuring the consistency, reliability, and stability of every batch of products.

Professional Customization Services: NewBee Transmission has a senior R&D engineering team with more than 15 years of experience in tapered roller bearing design and manufacturing, which can provide one-stop customized solutions according to customers' specific working conditions and equipment design requirements. Whether it is non-standard size design, contact angle adjustment, corrosion-resistant material modification, special seal structure design, or custom lubrication solutions, the team can efficiently complete design, sample development, and mass production. The sample development cycle for customized models is only 6–12 weeks, with urgent production support for key projects.

Reliable Quality Assurance & After-Sales Service: All products strictly comply with ISO9001 quality management system standards and international bearing industry standards, with a standard product warranty period of 18 months. The company has a complete after-sales service system, providing 24/7 online technical consultation, on-site installation guidance, and professional maintenance training. For any quality problems caused by the product itself, the company implements free replacement and maintenance services to ensure that customers’ production is not affected.

Efficient Logistics & Global Supply Chain: Relying on intelligent warehousing management and an optimized global supply chain, NewBee Transmission ensures a delivery cycle of 7–15 days for standard in-stock models. The company cooperates with top international logistics partners including DHL and FedEx, and has established overseas warehouses in Europe and North America, achieving fast and efficient delivery to customers around the world, fully supporting customers’ just-in-time production plans.

6.Precautions for Using Double Row Tapered Roller Bearing

Proper installation, lubrication, and maintenance are critical to maximizing the service life and ensuring the optimal performance of Double Row Tapered Roller Bearings, especially in heavy-load and harsh working conditions.

Key precautions are as follows: Standardized Installation Operation: Before installation, thoroughly clean the bearing, shaft, and housing bore to remove all burrs, oil stains, welding slag, and other impurities, to avoid raceway and roller wear during operation. Use specialized pressing tools for assembly, apply force evenly on the ring with interference fit, and strictly prohibit hammering or impact knocking, which will cause raceway deformation, roller damage, and permanent precision loss. After installation, accurately adjust the bearing clearance or preload according to the equipment specifications, and check the coaxiality of the shaft and housing bore to avoid misalignment.

Scientific Lubrication Management: Select the appropriate lubricating grease or oil according to the working temperature, rotational speed, and load conditions. For high-temperature environments (≤150°C), use high-temperature special grease; for medium-high speed operation, use low-viscosity lubricating oil. Open-type bearings require regular lubrication replenishment, with grease replacement every 1000–1800 working hours; sealed bearings should be inspected regularly for grease leakage, with timely seal replacement and grease replenishment if leakage is found. Strictly avoid over-lubrication (which will increase friction and heat generation) or insufficient lubrication (which will cause dry friction and premature bearing failure).

Real-Time Operation Monitoring: During equipment operation, continuously monitor the temperature, vibration, and noise of the bearing in real time. The normal operating temperature of the bearing should be within 30–80°C, with a temperature rise not exceeding 18°C. If the temperature rises sharply or exceeds the limit, it may indicate insufficient lubrication, installation misalignment, or overload, and the equipment should be shut down for inspection immediately. Abnormal vibration or noise may signal roller/raceway wear, cage damage, or foreign matter ingress, requiring timely disassembly and inspection.

Proper Storage & Handling: Store the bearings in a clean, dry, and ventilated environment with a relative humidity of ≤60%, and avoid direct contact with acids, alkalis, and other corrosive substances to prevent rust and corrosion. Bearings should be stored horizontally in their original packaging, and heavy stacking on the bearing packaging is strictly prohibited to prevent ring deformation. During transportation and handling, use shockproof packaging to avoid collision, dropping, or severe vibration, which will damage the bearing’s internal structure and precision.

Regular Inspection & Scheduled Maintenance: Conduct regular disassembly and inspection according to the equipment’s operating cycle and working conditions. Check the wear condition of the raceways and rollers, the integrity of the cage, the condition of the seals, and the remaining lubricant quality during inspection. If abnormal wear, pitting, deformation, or damage is found, replace the bearing in time to avoid secondary damage to the host equipment caused by bearing failure. After inspection and maintenance, thoroughly clean the bearing and related parts, reapply qualified lubricant, and reinstall correctly according to the assembly specifications.

Technical Specifications of Double Row Tapered Roller Bearing

For technical specifications, pricing, or custom engineering solutions:

Email: paul@newbeetrans.com

Website: www.newbeetrans.com