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The Universal Cardan Drive Shaft SWC490BH is engineered for tooth-embedded hot rolling mills that demand extreme torque transmission, dimensional precision, and uninterrupted operational reliability. Carrying a nominal torque rating of 500 kN·m across a 490 mm gyration diameter, this cardan shaft bridges the gap between high-power prime movers and roll-stand driven components with engineered certainty. UK steel processing facilities, heavy-plate rolling lines, and rod and bar mills operating around the clock rely on the SWC490BH to keep production targets intact under temperatures that would compromise lesser components. The shaft’s universal joint architecture allows angular displacement compensation of up to 15°, absorbing the real-world misalignments that arise in mill foundations subject to thermal cycling and mechanical vibration — conditions that are simply unavoidable in live hot rolling environments.
Teknik Özellikler
SWC490BH — Tooth Embedded Cardan Drive Shaft for Hot Rolling Mill
▍ Primary Parameters
| Model No. | Gyration Dia. D (mm) |
Nominal Torque Tn (kN·m) |
Fold Angle β (°) |
Fatigue Torque Tf (kN·m) |
Flex Travel Ls (mm) |
Min Length Lmin (mm) |
|---|---|---|---|---|---|---|
| SWC490BH | 490 | 500 | ≤15 | 250 | 190 | 1985 |
▍ Dimensional Parameters (mm)
| Model No. | D1 (js11) | D2 (H7) | D3 | Lm | n-d | k | t | b (h9) | g |
|---|---|---|---|---|---|---|---|---|---|
| SWC490BH | 435 | 275 | 325 | 270 | 16-31 | 47 | 12 | 90 | 22.5 |
▍ Rotating Inertia & Weight
| Model No. | Rotating Inertia at Lmin (kg·m²) |
Rotating Inertia at Lmin+100mm (kg·m²) |
Ağırlık at Lmin (kg) |
Ağırlık at Lmin+100mm (kg) |
|---|---|---|---|---|
| SWC490BH | 32.86 | 0.4744 | 1452 | 21.7 |
Materials, Principles & Application Scenarios
Malzeme Bileşimi
The SWC490BH cardan shaft is precision-machined from alloyed structural steel — commonly 42CrMo4 or equivalent — selected for its exceptional tensile strength, toughness, and resistance to fatigue under repetitive cyclic loading. The yokes and cross journals are subjected to controlled induction hardening, achieving surface hardness values that extend bearing contact life without brittling the core. All sealing elements use heat-resistant compounds rated for continuous exposure to mill scale, steam, and cooling water splash typical of UK integrated steel works. Bolt-grade hardware is class 10.9 throughout, torque-verified at assembly to prevent joint slip under shock load spikes.
Working Principle
At its core, the SWC490BH relies on two Hooke’s joint (universal joint) assemblies — one at each flange end — connected by an intermediate sliding shaft section. This arrangement transmits torque through the cross-and-yoke mechanism, which accommodates angular offset between the gearbox output and the roll-stand input. The tooth-embedded coupling interface at the driven end meshes directly with the spindle tooth profile, creating a positively engaged connection that eliminates backlash under reversing loads — an important feature in reversing roughing mill passes common in UK wide-plate production.
Application Scenarios
The SWC490BH cardan shaft is deployed across the full hot rolling production chain. In the main drive system, it bridges the reduction gearbox to the roll-stand pinion for continuous slab or bloom rolling. In multi-stand tandem mills, individual shafts connect each stand independently, allowing coordinated speed sequencing without coupling interference. It is equally suited to coiler mandrel drives, entry and exit pinch roll assemblies, and deflector roll systems in heavy-gauge strip mills. UK specialty steel producers processing stainless, tool steel, and spring steel billets commonly specify this shaft model for its combination of torque capacity and geometric stability at elevated ambient temperatures.
Key Performance Advantages
500 kN·m Nominal Torque
Designed to absorb roll-biting shock loads without fatigue crack initiation — essential for heavy-pass slab rolling in UK steel works operating at high campaign lengths.
Angular Compensation ≤15°
The universal joint geometry accommodates real-world shaft misalignment from mill frame deflection, thermal expansion, and pass schedule roll gap changes without inducing parasitic bending loads on gearbox bearings.
Low Maintenance Design
Grease-retained cross journal bearings with extended re-lubrication intervals reduce planned maintenance frequency, increasing availability rates in 24/7 mill operations where downtime cost is highest.
Efficient Power Transfer
Precision-ground joint geometry minimises velocity fluctuation at the driven end, delivering smooth torque flow that reduces roll mark risk on sensitive surface-quality products.
High-Temperature Tolerance
Rated for continuous operation in ambient conditions above 200°C, with material grades and sealing systems selected to maintain dimensional integrity across the full operating range of steel reheating furnace exit zones.
190 mm Flex Adjustment Range
The telescoping intermediate shaft provides 190 mm of axial displacement travel, absorbing housing growth and spindle stroke variation without requiring coupling dismantling during roll-change procedures.
Customer Success Cases
Real results from industry partners across the UK and beyond
A specialty flat-products producer in South Yorkshire had been experiencing progressive universal joint bearing failures on their existing cardan shafts within 14 months of installation — well short of the target 36-month campaign life. Root-cause analysis revealed that the OEM shafts were undersized for the torque spikes generated during cobble recovery sequences on their 5-stand tandem hot strip mill. The mill engineering team contacted us for a replacement specification review.
We supplied four SWC490BH cardan drive shaft assemblies, each with upgraded grease-flushing ports to address the contamination pathway identified in the failure analysis. After 26 months of continuous operation, zero bearing failures have been recorded. Planned inspection intervals have been extended from 8 weeks to 16 weeks, and the maintenance team reports a significant reduction in unplanned mill stops attributed to drive-line issues. The site procurement manager confirmed the shafts had already exceeded the previous OEM campaign life and showed no measurable wear on the cross journals at the most recent borescope inspection.
“We specified the SWC490BH after reviewing the torque capacity data and the engineering team’s recommendation. The difference in campaign life compared to our previous supplier has been substantial. We’ll be standardising on this model for the next rolling schedule.”
— Senior Mechanical Engineer, South Yorkshire Steel Processing Facility
“The SWC490BH shaft we installed on our bloom mill main drive has been running for 22 months without any intervention. Build quality is clearly at a different level from what we had before. The tooth-embedded interface is very well-machined.”
David H.
Maintenance Manager — Heavy Sections Mill, Wales, UK
“We ordered two units for our hot rolling rougher drive stands and both were delivered ahead of schedule with complete dimensional verification reports. The price-to-performance ratio is genuinely competitive versus European alternatives.”
Roberto M.
Plant Engineer — Steel Rolling Division, Northern Italy
“Technical support during the enquiry phase was thorough — the engineering team provided a full dimensional drawing set and confirmed fit against our existing housing without us needing to send samples. That kind of service is rare with overseas suppliers.”
Gareth T.
Procurement Lead — Rod Mill Operations, Midlands, UK
Manufacturing Capability & Custom Solutions
With over 20 years of dedicated production experience in industrial cardan drive shaft manufacturing, our facility operates a comprehensive CNC machining and universal joint assembly production line, purpose-built for heavy metallurgical components. Dimensional tolerances are held to IT6 class on all critical bearing seats and journal diameters, with 100% dimensional inspection before dispatch supported by calibrated CMM equipment and traceable measurement records.
We offer full custom specification support for UK clients who need SWC490BH variants with modified flange bolt patterns, altered Lmin lengths for specific mill housing dimensions, non-standard tooth profile interfaces, or corrosion-protection coating systems for humid or marine-adjacent environments. Drawing-based orders are accepted in DXF, STEP, and PDF format, and we can work from site-measured dimension sheets where original drawings are unavailable. OEM and private-label supply is available for mill builders and engineering contractors requiring supply-chain integration.
Related Industrial Cardan Drive Shafts
We manufacture and supply a complete range of SWC-series cardan shafts for industrial and metallurgical machinery. UK buyers and international OEM customers frequently pair the SWC490BH with the following models for complete drive-line supply:
Industrial Cardan Drive Shaft SWC200BH for Slitting Machine
A mid-range SWC-series cardan shaft designed specifically for metal slitting line applications. Delivers precise, low-vibration torque transmission between the main drive gearbox and slitting head spindle, making it a preferred choice for precision strip processing facilities across the UK and Europe.
Industrial Cardan Drive Shaft SWC150BH for Slitting Machine
The SWC150BH is a compact-diameter cardan shaft designed for lighter-duty slitting machine drive trains. Its smaller gyration envelope makes it ideal for space-constrained machine tool installations where a full-size SWC shaft cannot be accommodated without drive-end housing modification.
Ready to Source SWC490BH Cardan Drive Shafts for Your Rolling Mill?
Our engineering team is available to review your torque requirements, confirm shaft compatibility, and provide a competitive quotation for UK and international delivery.
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