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What is the Screw Down Bearing?

A Screw Down Bearing is a heavy-duty, full-complement tapered roller thrust bearing designed for rolling mills, handling extremely high axial loads and allowing angular movement of the screw spindle to precisely adjust metal thickness, featuring long, large-diameter rollers and often a sphered washer for alignment. 

1. <!--[endif]-->Features of Screw Down Bearing

Screw Down Bearings stand out in ultra-heavy-load industrial applications due to their targeted structural optimization and industry-leading performance advantages, with core features as follows:

Extreme Load-Bearing Capacity:Adopting an optimized raceway curve design and full-complement roller arrangement, the bearing maximizes the effective contact area between rollers and raceways, evenly distributing radial and axial combined loads to each roller. Its maximum axial static load capacity can reach up to 40150 kN, which is 50% higher than conventional heavy-load bearings, fully adapting to the ultra-heavy-load requirements of rolling mills, hydraulic presses, and other large-scale equipment.

Wide Temperature Range:Adaptability Designed with high-temperature resistant materials and special surface hardening treatment, the bearing operates stably in a wide temperature range of -40°C to +200°C. It maintains excellent wear resistance and anti-seizure performance even in high-temperature metallurgical environments, avoiding operational failures caused by thermal deformation.

High Rigidity & Deformation Resistance:The reinforced integral inner and outer ring structure minimizes cumulative assembly errors and enhances structural stability under extreme loads. Even under ultra-heavy loads and high-frequency impact, the bearing exhibits strong deformation resistance, ensuring precise axial positioning and stable operational accuracy of equipment.

Cost-Effective Import Substitution:The technical indicators of the bearing, including load capacity, precision, and service life, are fully aligned with international renowned brands. It ensures a stable and reliable supply chain while reducing procurement costs by 20%-30% compared with imported products, making it an ideal choice for domestic substitution in heavy industrial fields.

Strong Harsh Environment Adaptability:With outstanding dustproof, impact-resistant, and corrosion-resistant performance, the bearing is well-suited for harsh working conditions such as dusty mining sites and high-temperature metallurgical workshops. The optional composite seal structure further enhances protection against external contaminants, extending service life in complex environments.

Flexible Customization Capabilities:Supports comprehensive non-standard customization, including non-standard size adjustment (inner diameter/outer diameter/thickness), material upgrade (high-temperature resistant G20Cr2Ni4A alloy carburized steel, corrosion-resistant stainless steel), structural optimization (adapted to specific equipment mounting requirements), special lubrication solutions (high-temperature/heavy-load dedicated grease), and seal type enhancement, fully meeting the personalized needs of different industries and equipment.

2. <!--[endif]-->Applications of Screw Down Bearing

Leveraging its extreme load capacity, wide temperature adaptability, and high rigidity, Screw Down Bearings are widely used in 10 key industrial fields, becoming an indispensable core component in heavy-duty mechanical systems:

Rolling Mills (Primary Application):As the core component of screwdown systems in hot rolling mills, cold rolling mills, plate mills, and strip mills, the bearing precisely controls the roll gap and rolling pressure, ensuring uniform thickness of metal workpieces during the rolling process.

Steel & Metallurgical Equipment:Widely applied in blooming mills, slabbing mills, and Steckel mills, it withstands enormous axial forces generated during metal deformation, adapting to high-temperature, dusty, and high-impact working conditions in steel production lines.

Heavy Industrial Presses:Installed in forging presses, hydraulic presses, and screw presses, the bearing provides accurate axial positioning under ultra-heavy loads, ensuring stable force transmission and precise forming in high-pressure processing of metal workpieces.

Non-Ferrous Metal Processing:Used in aluminum rolling mills, copper rolling mills, and other non-ferrous metal processing equipment, it ensures stable thickness control and repeatable positioning during the rolling process, maintaining consistent product quality.

Mining & Heavy Industrial Machinery:Applied to crushers, compactors, and heavy-duty conveyor systems, it withstands heavy axial forces and high-frequency impact loads in mining operations, with strong adaptability to dusty and harsh outdoor environments. Large Screw Mechanisms:Integrated into jack screws, lifting systems, and positioning screws of large equipment, the bearing handles heavy thrust loads with high precision, ensuring stable and reliable operation of lifting and positioning mechanisms.

Heavy-Duty Gearboxes & Reducers:Used in industrial heavy-duty gearboxes and speed reducers for large machinery, it supports combined radial and axial loads generated by gear meshing, maintaining stable transmission performance and reducing vibration and noise.

Marine & Offshore Equipment:Applied to offshore platform lifting systems, shipborne hydraulic presses, and other marine heavy machinery, the corrosion-resistant customized version adapts to humid and salt-spray environments, ensuring long-term reliable operation.

Construction & Heavy Engineering:Installed in large construction cranes, hydraulic pile drivers, and other equipment, it withstands heavy axial loads and shock loads during construction operations, adapting to complex and harsh on-site working conditions.

Precision Heavy Machinery:Used in precision positioning mechanisms of large machine tools, heavy-duty testing equipment, and other precision heavy machinery, it balances high rigidity and positioning accuracy, meeting the requirements of precise operation under heavy loads.

3. <!--[endif]-->Price of Screw Down Bearing

The price of Screw Down Bearings is determined by multiple interrelated factors, with core influencing elements as follows:

Size & Load Rating:Size is the primary pricing driver. The standard product line covers an inner diameter (d1) range of 127–700 mm, outer diameter (D) of 150–800 mm, and thickness (T) of 48–270 mm. Larger bearings consume more high-quality bearing steel and require more complex precision machining and heat treatment processes, leading to significantly higher costs. Bearings with ultra-high load ratings (above 20000 kN) also have a premium price due to their reinforced raceway structure and thicker wall design.

Precision Grade:Precision grades follow the international standard hierarchy: P0 < P6 < P5. High-precision P5 grade bearings require stricter grinding processes, multi-round precision testing, and strict quality sorting, with a higher production rejection rate. Their prices are 40%-60% higher than standard P0 grade bearings.

Material Selection Standard:GCr15 high-carbon chromium steel is the most cost-effective option; upgrading to G20Cr2Ni4A alloy carburized steel for high-temperature resistance increases raw material costs by 50%-80%, while corrosion-resistant stainless steel materials can raise costs by 60%-100%. Cage material also affects pricing: brass cages are more expensive than heavy-load dedicated composite material cages.

Structural Design & Customization Standard:TTSV/TTSX series open-type bearings are the most economical. Non-standard customization, such as size adjustment, structural optimization for specific equipment, and integrated composite seal design, requires custom tooling and additional machining processes, increasing costs by 15%-60% based on customization complexity.

Seal & Lubrication Configuration:Open-type bearings are the base economical option; adding contact seals or composite seals increases costs by 15%-30%. Special lubrication solutions, such as high-temperature resistant grease or food-grade lubricants for special industries, also raise the overall product price.

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. <!--[endif]-->How to choose the Screw Down Bearing

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

Working Condition Matching First, clarify core working parameters, including axial/radial load magnitude, load type (static/dynamic), operating temperature, rotational speed, environmental conditions (dusty, high-temperature, corrosive), and installation alignment accuracy. For high-temperature metallurgical scenarios, select G20Cr2Ni4A high-temperature resistant material; for corrosive environments, choose corrosion-resistant stainless steel with composite seals.

Size & Precision Grade Confirmation:Strictly determine the bearing’s inner diameter (d1), outer diameter (D), thickness (T), and mounting hole specifications (M12–M48) according to equipment design drawings. For general heavy-load equipment such as ordinary rolling mills, P0/P6 grade bearings can meet requirements; for precision equipment such as high-precision hydraulic presses and testing machinery, P5 grade high-precision bearings are recommended to ensure positioning accuracy.

Material & Cage Selection:For standard working conditions (-40°C to +120°C, clean environment), GCr15 high-carbon chromium steel and brass cages are cost-effective choices. For high-temperature environments (above 120°C), select G20Cr2Ni4A alloy carburized steel; for heavy-impact scenarios, choose heavy-load dedicated composite material cages to enhance impact resistance.

Load & Speed Capacity Verification:Calculate the actual static and dynamic loads of the equipment, and select bearings with basic load ratings 1.2–1.5 times higher than the actual working loads to reserve a safety margin for shock loads. Verify that the bearing’s limiting speed matches the equipment’s maximum operating speed, avoiding overspeed operation that may cause lubrication failure or cage damage.

Supplier Qualification:Assessment Prioritize professional suppliers with mature production capabilities and industry experience, such as NewBee Transmission. Verify the supplier’s ISO9001 quality certification, advanced production equipment (CNC precision grinders, integral heat treatment lines), and complete product testing reports. Evaluate after-sales service capabilities, including warranty periods, on-site installation guidance, and 24/7 technical support, to ensure timely resolution of post-purchase issues.

Cost-Effectiveness Balance:Avoid blind pursuit of ultra-high specifications that exceed actual needs. Select products matching the equipment’s importance and working conditions: use standard materials and precision grades for non-critical equipment to control costs; for core equipment such as key rolling mill screwdown systems, prioritize product reliability and performance, and reasonably select customized solutions to ensure long-term stable operation.

5. <!--[endif]-->Manufacturer of Screw Down Bearing

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

Comprehensive Product Range:The standard Screw Down Bearing product line covers TTSV (4297 series) and TTSX (4379 series) models, with inner diameter (d1) ranging from 127 mm to 700 mm, outer diameter (D) from 150 mm to 800 mm, and thickness (T) from 48 mm to 270 mm. Precision grades include P0, P6, and P5, with cage options of brass or heavy-load dedicated composite materials. The company also provides non-standard customization services for special working conditions, fully meeting diverse application needs.

Advanced Production & Testing Capabilities:Equipped with internationally advanced CNC precision grinding machines, integral automatic heat treatment lines, high-precision roller sorting equipment, and a professional bearing testing center, the company implements strict 100% inspection throughout the production process. From raw material spectral analysis and metallographic testing to finished product load capacity, precision, and wear resistance testing, every batch of products undergoes comprehensive quality verification to ensure consistency and reliability.

Professional Customization Services:The company’s R&D team consists of senior engineers with over 15 years of experience in Screw Down Bearing design and manufacturing, providing one-stop customized solutions according to customers’ specific working conditions and equipment requirements. Whether it is non-standard size design, high-temperature/corrosion-resistant material modification, structural optimization, or special lubrication and seal 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 in metallurgy and mining industries.

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 12 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 quality problems caused by product defects, the company implements free replacement and maintenance services to ensure uninterrupted customer production.

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 international logistics partners such as DHL and FedEx, and has established overseas warehouses in key regions, achieving fast and efficient delivery to customers worldwide, fully supporting customers’ just-in-time production plans.

6. <!--[endif]-->Precautions for Screw Down Bearing

Proper installation, lubrication, and maintenance are critical to maximizing the service life and performance of Screw Down Bearings, especially in ultra-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 burrs, oil stains, welding slag, and other impurities, avoiding raceway and roller wear caused by foreign matter. Use specialized pressing tools for assembly, applying force evenly on the ring with interference fit to avoid raceway deformation and roller damage caused by hammering or impact. Ensure the bearing’s mounting holes are aligned with the equipment’s fixing holes, and use appropriate bolts (M12–M48) for secure fastening to prevent loosening during operation.

Scientific Lubrication Management:Select lubricants based on working temperature and load conditions: use high-temperature heavy-load dedicated grease for high-temperature environments (above 120°C); use ordinary heavy-load lithium-based grease for standard conditions. Open-type bearings require regular lubrication replenishment, with grease replacement every 800–1500 working hours; sealed bearings should be inspected regularly for grease leakage, and seals and grease should be replaced promptly if leakage is found. Avoid over-lubrication (which increases friction and heat generation) or insufficient lubrication (which causes dry friction and premature wear).

Real-Time Operation Monitoring:During equipment operation, continuously monitor the bearing’s temperature, vibration, and noise. The normal operating temperature of the bearing ranges from 30°C to 80°C, with a temperature rise not exceeding 25°C. If the temperature rises sharply, or abnormal vibration or noise occurs, it may indicate insufficient lubrication, installation misalignment, or overload. Shut down the equipment immediately for inspection and troubleshooting to prevent catastrophic equipment damage.

Proper Storage & Handling:Store bearings in a clean, dry, and ventilated environment with relative humidity ≤60%, avoiding 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 packaging is strictly prohibited to prevent deformation of the inner and outer rings. During transportation and handling, use shockproof packaging to avoid collision, dropping, or severe vibration, which may damage the internal structure and precision of the bearing.

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

Technical Specifications of Screw Down Bearing

For technical specifications, pricing, or custom engineering solutions:

Email: paul@newbeetrans.com

Website: www.newbeetrans.com