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The Universal Cardan Drive Shaft SWC390BH is a precision-engineered heavy-duty coupling solution developed specifically for demanding rolling mill environments, including stainless steel, aluminium and alloy strip lines where continuous torque transmission and angular misalignment compensation are non-negotiable. Manufactured to rigorous dimensional and metallurgical standards, this universal cardan drive shaft combines a robust SWC-BH series cross-and-yoke architecture with a tooth-type connecting flange that enables rapid assembly, precise load distribution and outstanding fatigue resistance across 24/7 production cycles. UK fabricators, steelworks operators and plant engineers who require proven, certifiable components choose the SWC390BH for its documented track record in high-tonnage, high-speed strip rolling applications.
Why Engineers Specify the SWC390BH Universal Cardan Drive Shaft
Engineering advantages that translate directly into uptime and production economics.
High-Torque Capacity at Speed
The SWC390BH series is engineered to transmit substantial torques — up to and exceeding 1,000 kN·m depending on configuration — while maintaining rotational balance at the elevated RPM ranges typical of roughing and finishing rolling mills. The cross-and-bore joint geometry minimises velocity fluctuation, protecting downstream gearboxes and motors from harmful torsional shock loads that prematurely damage drive trains in continuous mill operation.
Tooth-Type Flange — Faster Maintenance
The BH designation indicates an integral tooth-type connecting flange on both ends, which interlocks with the roll neck or gearbox output flange via involute spline teeth. This design eliminates alignment guesswork, distributes clamping load uniformly around the pitch circle, and allows mill maintenance teams to swap shaft assemblies in a fraction of the time needed with traditional bolted disc couplings — a significant advantage for UK steelworks operating shift-based schedules.
Angular Misalignment Compensation
Rolling mill stands shift under thermal expansion and roll-change cycles. The SWC390BH accommodates working angles up to approximately 10°–15° (model-dependent), absorbing misalignment that would fracture rigid couplings. This inherent flexibility protects bearing housings, prevents catastrophic shaft fracture, and extends the service interval of ancillary drive components — often the difference between planned maintenance and unscheduled downtime on a rolling line serving the UK automotive or stainless plate sector.
Premium Alloy Steel Construction
Forged from high-grade alloy steel (typically 42CrMo or equivalent), the yoke arms, cross-pin and tube are heat treated to precise hardness targets, ensuring core toughness with a hard wear surface. Exposed surfaces receive zinc phosphate pre-treatment followed by high-build epoxy or heavy-duty enamel finishing, protecting against the water, scale and lubricant mist conditions inherent in UK rolling mill environments. Internal grease nipples on every needle bearing cup allow in-situ re-greasing without shaft removal.
Dynamic Balance to ISO 1940 G6.3
Every SWC390BH shaft is dynamically balanced as a completed assembly on two-plane horizontal balancing equipment before despatch. Residual imbalance is held within ISO 1940/1 Grade G6.3 as standard, with G2.5 available on request for high-speed finishing stands. Proper balance reduces vibration-induced fatigue at the journal bearing seats, quietens the drive bay and extends gearbox bearing life — a factor of growing importance as UK mills pursue predictive maintenance programmes.
Customisable Lengths & Interfaces
Standard catalogue lengths cover the majority of mill-stand spacings, but our engineering team provides full custom sizing: extended telescopic tubes for wide mill stands, non-standard flange bolt circles, metric or inch spline profiles and alternative surface treatments for corrosive applications. Drawings are issued in DXF/PDF with GD&T callouts, enabling direct integration with your maintenance engineering and procurement workflows.
Technical Specification & Performance Data
SWC Series — General Arrangement Drawing with Key Dimensional References
| Параметр | SWC390BH Specification | Standard / Notes |
|---|---|---|
| Серияның белгіленуі | SWC390BH | SWC = Cross-yoke type; BH = Tooth-type flange both ends |
| Nominal Bore Diameter (D) | 390 мм | Flange outer ref; actual bore per customer spec |
| Номиналды айналу моменті (Tn) | ≥ 630 kN·m (standard config) | Higher capacity on request with modified cross-pin |
| Шаршау моменті (Tf) | ≥ 315 kN·m | Cyclic reversing load, 10^7 cycles basis |
| Max Working Angle (beta) | 10° (standard); up to 15° optional | Angle reduces permissible torque proportionally |
| Max Rotational Speed | Up to 500 RPM (balanced assembly) | Subject to working angle and length |
| Shaft Body Material | 42CrMo4 alloy steel forging | Quenched & tempered; HB 240–280 |
| Cross-Pin Material | 20CrMnTi case-hardened alloy steel | Surface hardness HRC 58–62 |
| Фланецті қосу түрі | Involute tooth-type (BH) — both ends | Custom bolt-circle PCD and tooth count on request |
| Майлау | Grease via Zerk/BSP nipples (each cup) | NLGI-2 lithium complex EP grease recommended |
| Динамикалық тепе-теңдік дәрежесі | ISO 1940/1 G6.3 (G2.5 optional) | Two-plane horizontal balancing machine |
| Беттік өңдеу | Zinc phosphate + heavy-duty enamel paint | Salt-spray tested ≥ 500 h; custom coating available |
| Overall Length Range (L) | Catalogue range; custom lengths accepted | Telescopic intermediate tube standard |
| Quality & Documentation | Material cert (EN 10204 3.1), dimensional report, balance cert | Third-party inspection available on request |
Working Principle, Material Technology & Application Scenarios
The SWC390BH universal cardan drive shaft operates on the Hooke’s joint (universal joint) principle: two yoke assemblies — each forged as one piece with the connecting flange — are coupled through a precision-ground cross-pin carrier and four needle-roller bearing cups. As the driving and driven shafts form an angle, the cross-pin geometry allows continuous rotation while compensating for the angular offset. Where a single Hooke’s joint introduces a cyclic speed variation (approximately twice per revolution) proportional to the sine-squared of the working angle, the SWC390BH is supplied as a phased double-joint assembly for most rolling mill applications, cancelling the output velocity ripple and delivering near-constant angular velocity to the roll neck — protecting the mill product from uneven reduction and surface defects.
From a metallurgical standpoint, the choice of 42CrMo4 for the main structural members is deliberate: its chromium-molybdenum alloying delivers a yield strength in excess of 900 MPa after heat treatment, combined with the toughness needed to absorb mill cobble shock events without brittle fracture. The cross-pin, subjected to combined bending and contact stress from the needle rollers, is manufactured from 20CrMnTi — a carburising steel that develops a case depth of 1.2–1.8 mm at HRC 58–62, backed by a tough, lower-hardness core. This combination is proven in Chinese and European rolling mills and has been validated across decades of industrial deployment. For UK procurement teams, full EN 10204 3.1 material certificates are available on all structural components, providing the traceability required by major UK steel producers and automotive OEM supply chains.
Stainless Steel Rolling Mills
Primary application — roughing and finishing stands where angular misalignment varies with roll gap adjustment and pass schedule. The SWC390BH handles the extreme shock loading of stainless cobble events without flange joint separation, keeping roll parting to a minimum.
Aluminium & Non-Ferrous Strip Lines
Constant-velocity phased pair configurations for foil and thin-gauge aluminium cold mills, where velocity ripple would print periodic surface marks. Custom length telescopic assemblies accommodate reversing-mill pass-line variation.
Paper, Mining & Heavy Process Plant
Also supplied to UK mining, dredging and paper mill operators as drive shafts connecting motors to crushers, kilns and pulp digesters — wherever large working angles, high torque and demanding duty cycles coincide in a single drivetrain.
Customer Success Stories
Real deployments. Measurable outcomes. Engineering you can rely on across industry sectors.
Case Study — UK Stainless Steel Mill, Yorkshire
Eliminating Unplanned Downtime on a 4-High Stainless Roughing Stand
A Yorkshire-based producer of 304 and 316 stainless plate was experiencing catastrophic cross-pin failures on their roughing stand drive approximately every 11 weeks, resulting in an average 18 hours of unplanned downtime per incident — enough to cost the mill over £90,000 per failure event in lost production and emergency labour. Their existing supplier’s cardan shafts were showing fatigue cracks at the yoke root after as few as 80,000 mill revolutions.
After reviewing the mill’s torque spike data and working angle variation across the pass schedule, our engineering team recommended the SWC390BH with an uprated cross-pin material (20CrMnTi at HRC 60 case, 200 mm deep case depth), revised needle bearing clearances for the mill’s operating temperature range, and a dual-lip seal upgrade for the water-rich roughing environment. Two shafts were manufactured, dynamically balanced to G2.5 and despatched with full EN 10204 3.1 documentation.
The replacement SWC390BH shafts completed their first scheduled overhaul at 24 months without failure — more than double the previous mean time between replacements — and the mill has since committed to a rolling three-shaft supply agreement covering both roughing and intermediate stands. The total annual saving in downtime and emergency repair costs has been conservatively calculated at over £200,000.
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“We had tried two other cardan shaft suppliers before switching to Ever-Power. The SWC390BH has been running on our 4-high roughing stand for over two years now without a single unplanned change-out. The quality of the material certification and the dimensional accuracy of the tooth-type flanges saved us days of fitter time during installation.”
— Maintenance Engineering Manager
Stainless Steel Producer, Sheffield, UK
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“Our procurement team was initially cautious about sourcing heavy cardan shafts from China. The EN 10204 3.1 material certs, dimensional reports and third-party inspection option gave us full confidence. Lead times were better than our previous European supplier, and pricing was significantly more competitive for identical performance.”
— Senior Buyer, Capital Equipment
Aluminium Strip Mill, Midlands, UK
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“We run three cement kilns in Scotland and needed large-diameter cardan shafts to replace ageing couplings on the drive trains. The engineering team at Ever-Power worked through our interface drawings, identified a tooth-type flange variant compatible with our existing gearbox flanges, and delivered on schedule. Vibration levels after installation are noticeably lower than with the old shafts.”
— Plant Engineer
Cement Production Group, Scotland, UK
Manufacturing Capability & Custom Engineering
With over 20 years of dedicated manufacturing experience in heavy industrial couplings and power transmission components, our production facilities operate across a 40,000 m² campus equipped with CNC vertical turning centres capable of handling workpieces up to 1,600 mm in diameter, multi-axis CNC milling for yoke arm profiling, computerised heat treatment furnaces with independent atmosphere control, and dedicated two-plane dynamic balancing capacity for shafts up to 5,000 mm in length. Every SWC390BH universal cardan drive shaft passes through in-process dimensional inspection at each machining stage using CMM (coordinate measuring machine) verification, followed by final assembly inspection and balance certification before crating.
Custom engineering is a core strength — not an afterthought. Our design office issues bespoke DXF/PDF drawings for non-standard shaft lengths, alternative flange bolt-circles, modified working angles, special coatings, and composite material options for corrosive process environments. UK clients supply their interface drawings; we return a proposal with preliminary design, material selection rationale and a competitive price — typically within five working days. Third-party inspection (SGS, BV, TÜV) and independent material testing can be arranged at customer request, satisfying the procurement requirements of major UK steelworks, Tier-1 automotive suppliers and infrastructure contractors alike.
Explore Our PTO Drive Shaft Range
Beyond the SWC390BH cardan shaft, we supply a full portfolio of agricultural and industrial PTO drive shafts for tractors, implement drives and specialist field machinery.
PTO Drive Shaft G Series
The G Series is our general-purpose agricultural PTO drive shaft range, covering tractors from 35 to 120 hp. Fitted with industry-standard wide-angle constant-velocity (W.A.C.V.) joints, they handle the extreme steering angles of front-mounted implement attachments. Available with standard or heavy-duty driveline guards and multiple profile tube sizes for field-selectable torque ratings.
PTO Drive Shaft S Series
The S Series targets specialist applications requiring slip joint length compensation — ideal for trailed implements and cultivators where the hitch distance varies dynamically across field terrain. Inner cross and outer tube profiles are matched for smooth low-friction sliding under full torque, extending tube life compared with standard square-profile telescopic designs.
PTO Drive Shaft L Series
The L Series is designed for long-distance driveline spans on large combine headers, self-propelled foragers and trailed sprayers. Extended tube lengths and high-torsional-stiffness profiles minimise wind-up under high-inertia acceleration events, while the double-lemon or star profile tube section provides reliable torque transmission even with the inevitable wear that comes from high-cycle agricultural field use.
PTO Drive Shaft T Series
The T Series covers high-torque tractor PTO applications from 120 hp upwards, including round-balers, large forage wagons and heavy-duty stump grinders. Reinforced yoke castings, oversized cross-pin dimensions and heavy-wall tube profiles deliver the fatigue margin needed for full-season high-duty-cycle operation without cross-pin or tube replacement — reducing total cost of ownership for UK agricultural contractors.
Жиі қойылатын сұрақтар
Answers to the questions UK engineers and procurement managers ask most often about universal cardan drive shafts for rolling mills.
What is the price of a heavy-duty universal cardan drive shaft for a stainless steel rolling mill in the UK?
Pricing for the SWC390BH universal cardan drive shaft varies depending on the shaft length, custom interface requirements, material certification level and order quantity. We invite UK stainless steel mill operators to contact our sales team at [email protected] with your interface drawing or existing part number for a tailored quotation — typically returned within two working days.
How long does it take to get a custom cardan drive shaft delivered to a UK rolling mill site?
Standard SWC390BH configurations from stock or semi-finished inventory are typically despatched within 15–20 working days. Fully custom shafts with non-standard flanges, extended lengths or special material certification generally require 30–45 working days from drawing approval to shipment. We work with leading UK freight forwarders for air, sea and express courier options — and can arrange DDP delivery to any UK steelworks, including Scottish sites.
Which universal cardan drive shaft series is best suited for a four-high aluminium roughing mill in the UK Midlands?
For a four-high aluminium roughing mill, the SWC390BH or an adjacent SWC series size is typically recommended — the exact model depends on the roll-neck interface diameter, inter-stand distance and maximum torque at the nominated pass schedule. Our application engineers can analyse your mill data and select the optimal configuration. Where velocity ripple is a concern for surface quality, we supply phased double-joint assemblies to cancel the Hooke’s joint first-harmonic.
Where can I find a reliable cardan drive shaft supplier for stainless steel mills that can provide EN 10204 3.1 material certification?
We supply EN 10204 3.1 material certificates as standard for all structural steel components on the SWC390BH, including the yokes, tube, cross-pin and flange. These are issued by the approved testing laboratory associated with our forge and heat-treatment supplier. Third-party inspection by SGS, Bureau Veritas or TÜV can be arranged at order placement for clients whose procurement procedures require independent witness testing — a common requirement for UK nuclear, defence and major steelworks supply chains.
How do I calculate the correct working angle and torque rating when specifying a cardan drive shaft for my rolling mill stand in Scotland?
The working angle is determined by the vertical and horizontal offset between the motor/gearbox centreline and the roll-neck centreline at maximum roll-gap opening. The effective torque must account for the dynamic service factor — typically 2.0–2.5 for roughing mills with high-inertia cobble events. Our datasheet includes a worked selection example, and our team can run a full selection calculation from your mill parameters. Send your mill drawing and motor nameplate data to [email protected] for a free engineering review.
What maintenance intervals are recommended for a heavy cardan shaft running on a UK stainless steel rolling line operating three shifts per day?
For a three-shift stainless mill with high cobble frequency, we recommend re-greasing needle bearing cups every four to six weeks using NLGI-2 lithium complex EP grease, a visual inspection of seal lips and yoke arm surfaces every three months, and a detailed dimensional and torque check at every scheduled roll change campaign — typically every six to twelve months. At 24 months, it is good practice to strip and inspect the cross-pins regardless of apparent condition, as subsurface fatigue can develop without visible surface cracks in high-cycle environments.
Can I get a quote for a custom-length universal cardan shaft to replace an OEM unit on a German-built rolling mill operating in Wales?
Absolutely. We regularly supply drop-in replacement cardan shafts for SMS Siemag, Danieli, Primetals and other OEM rolling mill stands operating in the UK, including Wales and Northern England sites. All we need is the existing shaft’s overall and compressed length, flange bolt-circle and tooth profile, and the rated torque. If you have the OEM part number, we can often cross-reference directly. Contact [email protected] with your enquiry and we will respond within one working day.
Ready to specify the SWC390BH universal cardan drive shaft for your UK rolling mill?
Send your requirements — drawings, mill parameters or existing OEM part numbers — and receive a detailed technical proposal and competitive price from our engineering team.
