Industrial Cardan Drive Shaft SWC120BH for Steel Pipe Straightener

Rotational power begins at the straightener’s motor and enters the SWC120BH through an input yoke connected by coupling or flange, then travels through the shaft body toward the output yoke attached to the straightening mechanism. Each universal joint, also referred to as a Hooke’s joint, consists of yokes and a bearing cross that transfer rotational motion from the input side to the output side while tolerating angular deviation between the two shafts. As the input shaft rotates, this cross-and-yoke arrangement allows the SWC120BH cardan drive shaft to flex slightly without interrupting torque flow, which matters considerably on a straightening line where perfect alignment between motor and rollers is rarely achievable in a real factory layout.

Once torque reaches the output shaft, it drives the straightening rollers or other correcting components that apply force to the pipe as it passes through the line, gradually removing bends or deviations until the finished pipe meets the required straightness tolerance. Because pipe diameter and wall thickness vary between production runs, the SWC120BH cardan drive shaft must accommodate fluctuating load conditions while still delivering predictable torque, which is precisely why its compact, sealed-joint construction is specified across UK pipe mills handling mixed product ranges.

Lmin is the minimum collapsed length of the shaft body. D1, D2, and D3 are reference diameters at the yoke and flange connection points. Lm is the spline engagement length, n-d the bolt hole count and diameter, and k, t, b, g are flange and keyway dimensions used for fitting against the customer’s gearbox or motor housing. A dash indicates the dimension is not applicable to this model size.

Beyond steel pipe straighteners, the compact, high-torque profile of the SWC120BH suits a wider family of metallurgical machinery, and the cards below set out the specific roles this drive shaft plays across UK metal processing and pipe production operations.

Our facility is dedicated to the research, design, and manufacture of cardan drive shafts and related transmission components for metallurgical machinery, papermaking machinery, woodworking machinery, plastics machinery, mining machinery, and textile machinery. Computerised design technology, numerical-control machining equipment, and full-process inspection give every SWC120BH unit leaving the line consistent dimensional accuracy, whether the order is a single replacement shaft or a scheduled batch supply for a UK steel processing plant.

Length, flange size, and coupling type on the SWC120BH can all be tailored to match a specific straightener or rolling mill installation, removing the guesswork that comes with fitting a generic catalogue part to a non-standard machine layout. Engineers work directly from customer drawings or sample parts to confirm fit before production, supporting OEM partners and replacement parts buyers across UK manufacturing regions including the Midlands, Sheffield, and the North West.

Self-inspection runs on every unit before packing, and material certificates are available on request for buyers who need traceability documentation as part of their own quality system. Shipments are prepared with UK import requirements in mind, and a dedicated sales engineer is assigned to each enquiry so that specification questions get a direct, technically informed answer rather than a generic catalogue reply.

Finished SWC120BH cardan drive shaft units pass through a final dimensional check before packing, with each batch matched against the customer’s confirmed drawing or sample reference. This step-by-step verification process is part of why repeat UK buyers return to us for both standard catalogue orders and bespoke steel processing projects.

Need a custom SWC120BH specification or a quote for your pipe straightening line? Our engineering team responds to technical enquiries within one working day.

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A steel tube mill near Scunthorpe had been experiencing inconsistent pipe straightness on one of its production lines, with the maintenance team eventually tracing the issue to a worn drive shaft on the straightener that was no longer compensating correctly for the small misalignment between motor and roller housing. The plant’s production manager reported that the variation was most noticeable on thinner-wall pipe runs, where even slight torque irregularity translated directly into visible deviation in the finished product, leading to a higher rejection rate than the operation could comfortably absorb.

After reviewing the line’s torque requirement, bed length, and flange dimensions, our engineering team recommended an SWC120BH cardan drive shaft sized precisely to the existing connection points, replacing the worn unit without requiring any structural modification to the straightener housing. The compact, sealed-joint construction was specifically chosen to handle the varying loads produced across the mill’s mixed range of pipe diameters and wall thicknesses.

Since the replacement, the mill has reported a measurable reduction in rejected pipe runs and noticeably more consistent straightness readings across thinner-wall batches, with the maintenance team noting that torque delivery now feels steady throughout the full production shift rather than tapering off as the previous shaft wore. The mill has since placed a standing order for spare units to keep on site for future scheduled maintenance.

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