Description
The SWC-WD is the compact, without-flex, flange-type configuration of the SWC universal coupling family — combining the field-removable benefit of flanged hub connection with the maximum torsional stiffness of rigid (non-telescoping) construction. The ‘short’ designation refers to the reduced overall installed length compared to flange-type variants with telescoping elements. This heavy duty shaft coupling is the engineering default for marine propulsion driveline couplings, mining equipment with rigid mounting arrangements, and steel plant offset drives requiring field-removable hubs.
SWC-WD Specifications and Dimensional Range
The SWC-WD range covers gyration diameters from 100 mm to 490 mm. Maximum operating angle is 25 degrees through each joint, providing substantial parallel offset capability through dual-joint geometry. The compact design reduces overall installed length by approximately 30 percent compared to flange-type flex variants. Torque ratings match the SWC-WH equivalent for any given gyration diameter, with the bolt-on hub interface following standard industrial flange conventions.
| Model | Gyration Ø D (mm) | Nominal Torque Tn (kN·m) | Fatigue Tn Tf (kN·m) | Flex Angle β (°) | Bore D₂ (mm) | Lmin (mm) |
|---|---|---|---|---|---|---|
| SWC100WD | 100 | 1.25 | 0.63 | ≤25° | 20–44 | 180 |
| SWC150WD | 150 | 4.5 | 2.25 | ≤25° | 30–65 | 240 |
| SWC200WD | 200 | 16 | 8.0 | ≤25° | 40–95 | 300 |
| SWC250WD | 250 | 35 | 17.5 | ≤25° | 55–115 | 360 |
| SWC285WD | 285 | 71 | 35.5 | ≤25° | 75–130 | 390 |
| SWC315WD | 315 | 112 | 56 | ≤25° | 85–150 | 440 |
| SWC390WD | 390 | 224 | 112 | ≤25° | 100–175 | 510 |
| SWC490WD | 490 | 450 | 225 | ≤25° | 135–220 | 600 |
The compact installed length combined with flanged hub interfaces produces the smallest overall installation envelope in the SWC family at any given torque rating. The flange interface follows standard industrial bolt circle and pilot diameter conventions, supporting direct bolt-on installation against existing shaft flanges without machining or adapter plates.
SWC-WD Short Without Flex Flange Type Universal Coupling – compact bolt-on rigid cardan shaft. Ever Power Flange Couplings Australia Ltd.
What Distinguishes the SWC-WD from Other Universal Joint Types
The SWC-WD combines two engineering choices: without-flex (rigid) construction and flange-type (bolt-on) hub connection. The rigid construction delivers maximum torsional stiffness; the flanged hub provides field-removability. Together they produce a coupling specifically suited to compact installations where periodic removal for maintenance is required but the application demands precise output shaft position retention under reversing torque.
Marine propulsion driveline couplings are the primary application category — main engine to gearbox connections and gearbox to propeller shaft connections on commercial and naval vessels frequently specify SWC-WD variants. The compact installed length matches the tight engine room envelope, the bolt-on interface supports shipyard maintenance routines, and the rigid construction delivers the precise torque transmission required by controllable-pitch propeller systems.
Why Marine Propulsion Specifies SWC-WD
Vessel propulsion systems impose three requirements that the SWC-WD addresses uniquely: limited engine room envelope demands the compact installed length, periodic dry-dock inspection and maintenance demands the bolt-on field-removable hub interface, and precise propeller pitch control demands the rigid construction’s torsional stiffness. The without-flex configuration also eliminates the spline-engagement wear that would otherwise compound the maintenance demands of saltwater-exposed equipment.
Construction and Material Specification
Material specification follows the SWC family standard: 35CrMo alloy steel forging, full quench-and-temper heat treatment, induction-hardened trunnion journals to HRC 58-64. For marine applications, optional surface treatments including phosphating or zinc plating are available to enhance corrosion resistance in the saltwater-exposed engine room environment.
Sealed needle roller bearings are pre-lubricated at assembly with marine-grade synthetic grease as the standard for marine specifications. The flange bolt-on interface uses high-tensile structural bolts (Property Class 10.9 or 12.9 depending on size class) with appropriate washers and locking compound for vibration-resistant joint integrity.
Approximately 30 percent shorter than flange-type flex variants. Designed for tight installation envelopes including marine engine rooms, underground mining equipment, and steel plant compact drive arrangements.
Field-removable installation without welding. Bolts to existing flanged shaft stubs through standard industrial flange interface. Supports shipyard and mine site maintenance routines without site welding.
No telescoping spline contributes to wind-up under load reversal. Suitable for precision torque transmission applications including controllable-pitch propeller systems and reversing drum drives.
Same material and heat treatment as the SWC welding-type range. Optional marine surface treatments available for saltwater-exposed applications.
Pre-lubricated at assembly with marine synthetic grease as the marine specification standard. Lifetime sealing for the design service life under saltwater-exposed conditions.
Full material traceability, dimensional inspection records, and heat treatment certificates available. Marine surveyor approval documentation supplied on request for vessel classification society requirements.
Industrial Applications Across Heavy Industry
SWC-WD applications focus on compact installations requiring rigid construction and field-removable hub connections. Marine propulsion, mining equipment with rigid mounting arrangements, and steel plant offset drives all match this profile.
Marine Propulsion Driveline Couplings
Commercial vessel propulsion drivelines and naval vessel propeller shaft drives specify SWC-WD couplings between main engine and gearbox, and between gearbox and propeller shaft. The compact length suits tight engine room envelopes; the bolt-on interface supports shipyard maintenance routines; the rigid construction supports controllable-pitch propeller systems. Optional marine surface treatments and marine-grade bearings extend service life in saltwater-exposed environments.
Steel Production and Mining Compact Drives
Steel plant slab handling drives, bloom and billet transfer car drives, and mining equipment with rigid foundation mounting all specify SWC-WD couplings where the compact installation envelope and rigid construction match the application requirements. The bolt-on hub interface supports planned maintenance routines without the welding requirements of welded-yoke alternatives.
SWC-WD flange and yoke detail – compact rigid construction for marine propulsion and mining applications.
Selecting the Correct SWC-WD Size for Your Drive
Choose SWC-WD when your application requires compact installation envelope, bolt-on field-removable hub interface, and rigid (non-telescoping) construction. If the installation has significant axial movement, specify a flex variant. If the shafts are weldable and the coupling will not require field removal, the SWC-WH welded-yoke without-flex variant offers higher torsional stiffness.
Verify that the existing flange interface dimensions match the SWC-WD hub specifications. Where the existing interface is non-standard, custom hub machining is available from our Sydney facility within standard production lead times. For marine applications, specify marine-grade surface treatments and bearing lubricants at order to ensure correct documentation for vessel classification society approval.
Installation, Operation, and Maintenance Best Practice
Installation follows the flange-type universal coupling workflow with attention to bolt torque sequencing and locking compound application. For marine applications, follow the supplied marine-specific installation procedure including bearing inspection and seal verification before vessel commissioning.
Confirm existing shaft flange dimensions match SWC-WD hub specifications. Clean flange faces. For marine applications, verify foundation rigidity meets the design requirements — the rigid coupling has zero axial compliance.
Lift the coupling into position and engage the pilot register of each hub with the corresponding shaft flange. Verify smooth pilot engagement without interference. Apply locking compound to bolt threads if specified.
Install all flange bolts and hand-tighten in a cross pattern. Do not fully torque any bolt before all bolts are installed and hand-tightened. This prevents uneven preload distribution and pilot misalignment.
Torque all bolts to 30 percent of final value in cross pattern. Repeat at 60 percent. Then apply final torque. Use a calibrated torque wrench. For marine applications, witness inspection by the classification society surveyor may be required at this stage.
After installation, verify the operating joint angle through each Hooke’s joint is within the 25-degree rated maximum with safety headroom. For marine applications, dock trials confirm operating angles under actual vessel loading conditions.
Run at progressively increasing speed to full operating speed. Monitor vibration and joint temperature for first 50 hours. Recheck bolt torque at first scheduled maintenance interval.
OEM Cross-Reference and Order Specification
Cross-reference is available for Voith Turbo compact without-flex cardan shafts, Rexnord rigid flange-type universal couplings, marine driveline coupling specifications from major OEMs, and SKF compact industrial couplings. Provide OEM model code, gyration diameter, nominal torque, and flange interface dimensions for direct equivalent confirmation.
For marine applications, vessel classification society approval documentation (DNV, Lloyd’s Register, ABS, Bureau Veritas, ClassNK) is available on request. Provide vessel classification details and required documentation list at order. Class-approved couplings ship with the appropriate certificates of inspection and material conformance.
Why Choose Ever Power Australia
Ever Power Flange Couplings Australia Ltd. supplies SWC-WD couplings to the Australian marine, mining, and steel industries from our Sydney warehouse. Marine-grade surface treatments, classification society documentation, and compact installation engineering support are all included as standard services. Cross-reference work for OEM marine driveline coupling equivalents is included without additional charge.
Ever Power manufacturing facility — ISO 9001 certified, 12,000 m², 108 dedicated coupling machines, 20+ years of production experience.
Every order placed with our Sydney team is backed by full material traceability, dimensional inspection certificates on request, and direct access to the engineers who specified, machined, and packed your coupling. We do not subcontract technical support — when you phone +61 2 9708 3322 during NSW business hours, you reach the people who actually know the product.
Frequently Asked Questions
Quick answers from our Sydney technical team. Contact us for application-specific guidance.
1. When should I specify SWC-WD rather than SWC-WH? +
2. Is the SWC-WD suitable for marine propulsion driveline applications? +
3. Can I install SWC-WD without removing the existing shaft flanges? +
4. What classification society approvals are available for SWC-WD marine applications? +
5. How quickly can I receive an SWC-WD from your Sydney warehouse? +
Request a Quote — Sydney NSW Stock
Tell us your motor power, shaft diameter, and operating environment. Our New South Wales coupling team confirms availability and pricing within one business day, with same-day dispatch on standard sizes from Condell Park.
Ever Power Flange Couplings Australia Ltd. · 27 Harley Crescent, Condell Park NSW 2200 · [email protected]
