Description
The SWP-C is the compact, without-flex variant of the SWP flanged-hub universal joint coupling family — combining the compact envelope of SWP-B with the rigid construction of without-flex types. Three-yoke construction with two cross joints transmits power between parallel offset shaft centrelines without the telescoping element that flex variants use for axial compliance. This industrial shaft coupling configuration is the engineering default for short-distance precision drives where axial position retention is critical.
SWP-C Specifications and Dimensional Range
The SWP-C range covers gyration diameters from 160 mm to 700 mm. Maximum operating angle is 25 degrees through each joint, supporting substantial parallel offset capability. Torque ratings match the equivalent SWP-A and SWP-B sizes at any given gyration diameter. The without-flex compact construction produces the smallest envelope in the SWP range at any given torque rating.
| Model | Gyration Ø D (mm) | Nominal Torque Tn (kN·m) | Fatigue Tn Tf (kN·m) | Flex Angle β (°) | Bore D₂ (mm) | Lmin (mm) |
|---|---|---|---|---|---|---|
| SWP160C | 160 | 16 | 8.0 | ≤25° | 20–95 | 240 |
| SWP225C | 225 | 63 | 31.5 | ≤25° | 40–125 | 340 |
| SWP250C | 250 | 90 | 45 | ≤25° | 50–140 | 380 |
| SWP285C | 285 | 160 | 80 | ≤25° | 60–155 | 430 |
| SWP315C | 315 | 250 | 125 | ≤25° | 65–160 | 460 |
| SWP350C | 350 | 400 | 200 | ≤25° | 80–185 | 510 |
| SWP450C | 450 | 800 | 400 | ≤25° | 100–230 | 620 |
| SWP550C | 550 | 1,250 | 625 | ≤25° | 130–280 | 740 |
| SWP700C | 700 | 2,500 | 1,250 | ≤25° | 200–350 | 920 |
The compact installed length combined with flanged hub interfaces produces the smallest overall installation envelope in the SWP family. Without the telescoping element, the installed length is fixed at the design value — installations must maintain the design shaft-centre distance throughout the operating range.
SWP-C Short Without Flex Type Universal Joint Coupling – compact rigid flanged construction. Ever Power Flange Couplings Australia Ltd.
What Distinguishes the SWP-C from Other Universal Joint Types
The SWP-C combines three engineering choices: short body, without-flex (rigid) construction, and flanged hub connection. The compact rigid construction delivers maximum torsional stiffness in the smallest envelope of the SWP family. Three-yoke construction with two cross joints handles parallel offset between input and output shafts without requiring axial compliance.
Machine tool spindle drives, precision positioning equipment, and short-distance industrial drives with rigid mounting all match this profile. The without-flex construction is mandatory for applications where output shaft position retention under reversing torque is critical — any spline-fit clearance in a flex variant introduces position uncertainty during torque reversal that some precision applications cannot tolerate.
Parallel Offset Through Three-Yoke Construction
The three-yoke construction places two Hooke’s joints in series with the intermediate body forming the middle yoke. This arrangement supports parallel offset between input and output shafts proportional to joint angle and intermediate body length. For typical SWP-C applications at 5 to 10 degree joint angles, the parallel offset capability ranges from 30 mm on small sizes up to 200 mm on the largest size class.
Construction and Material Specification
Material specification follows the SWP family standard: 35CrMo alloy steel forging, full quench-and-temper heat treatment, induction-hardened trunnion journals to HRC 58-64. Without the telescoping splined intermediate shaft, the SWP-C construction is simpler and the bearing loading more predictable.
Sealed needle roller bearings are pre-lubricated at assembly. The flanged hub face is machined to ISO surface finish standards for proper bolt preload distribution. Flange bolts are high-tensile structural fasteners with appropriate washers and locking compound for vibration-resistant joint integrity.
Smallest envelope in the SWP family at any given torque rating. No telescoping element. Three-yoke construction with two cross joints.
Maximum torsional stiffness. No spline-fit clearance contributes to position uncertainty during torque reversal. Suitable for precision drives where output shaft position retention is critical.
Field-removable installation without welding. Standard industrial flange interface. Direct retrofit compatibility with most existing compact flanged universal coupling installations.
Three-yoke construction supports parallel offset between input and output shafts. Joint angles up to 25 degrees provide substantial offset capability proportional to intermediate body length.
Same material and heat treatment as the SWP flex variants. Trunnion cross interchangeability with equivalent gyration diameter sizes.
Pre-lubricated at assembly. Simplified bearing loading without spline-engagement forces.
Industrial Applications Across Heavy Industry
SWP-C applications focus on compact rigid drives with parallel-offset geometry. Machine tool spindle drives, precision positioning equipment, short-distance industrial drives, and certain optical instrumentation applications all match this profile.
Machine Tool Spindle Drives
CNC machine tool main spindle drives, particularly on horizontal boring mills, large machining centres, and grinding machines, specify SWP-C couplings between the motor or gearbox output and the spindle assembly. The compact rigid construction maintains precise spindle position under cutting load reversals. Position accuracy is critical for surface finish and dimensional precision in machined components.
Precision Positioning and Short-Distance Industrial Drives
Precision positioning equipment in optical instrumentation, scientific test equipment, and industrial robotics specifies the compact rigid variant for the combination of position retention and small envelope. Short-distance industrial drives with rigid mounting also commonly use SWP-C where the without-flex construction matches the application’s dimensional stability requirement.
SWP-C compact rigid assembly – no telescoping element, three-yoke construction for parallel offset drives.
Selecting the Correct SWP-C Size for Your Drive
Choose SWP-C when the application requires compact rigid construction with flanged hub connection. Verify foundation rigidity will maintain the design shaft-centre distance throughout the operating temperature range. For applications with axial movement, the flex variants (SWP-A or SWP-B) are the correct choice.
Calculate the parallel offset and verify both joints operate at equal angles in opposite directions. Verify the joint angle stays within 25-degree rated maximum with appropriate safety headroom for unplanned shaft movement.
Installation, Operation, and Maintenance Best Practice
Installation requires precise positioning to maintain the design shaft-centre distance throughout the operating range. Foundation rigidity is more critical for SWP-C than for flex variants because there is no telescoping element to absorb post-installation dimensional changes.
Confirm equipment foundations and mounting will maintain the design shaft-centre distance throughout operating temperature range. Any expected thermal growth must be accommodated by the supporting structure.
Measure parallel offset between input and output shaft centrelines. Calculate required joint angle. Verify joint angle sits within 25-degree rated maximum with safety headroom.
Lift coupling into position. Engage pilot register of each hub with corresponding shaft flange. Verify intermediate body sits in correct orientation for equal-and-opposite joint angles.
Install all flange bolts in cross pattern. Torque to 30, 60, 100 percent of final value with calibrated wrench. Apply locking compound if specified.
Rotate coupling through one complete revolution by hand. Verify both joints articulate smoothly at equal-and-opposite angles. Any asymmetry must be corrected.
Run at progressively increasing speed. Monitor output shaft for velocity ripple — smooth operation confirms correct joint angle setup. Inspect bearings at first scheduled maintenance.
OEM Cross-Reference and Order Specification
Cross-reference is available for Voith Turbo compact rigid cardan shafts, Rexnord compact rigid universal couplings, and SKF compact flanged industrial couplings. Provide OEM model code, gyration diameter, nominal torque, parallel offset, and flange interface dimensions for direct equivalent confirmation.
Custom intermediate body lengths between the two joints are available for non-standard installation envelopes. Provide a dimensioned drawing for engineering review — typical custom production lead times are 3 to 6 weeks depending on size class.
Why Choose Ever Power Australia
Ever Power Flange Couplings Australia Ltd. supplies the SWP-C compact rigid flanged universal joint coupling range from our Sydney warehouse. Commonly specified sizes are stocked at Condell Park. Custom intermediate body lengths and non-standard flange interfaces are handled by our in-house engineering team. Cross-reference work for Voith, Rexnord, and SKF compact rigid universal coupling equivalents is included without additional engineering charges.
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 SWP-C rather than SWP-B? +
2. Can the SWP-C handle axial movement? +
3. What parallel offset capability does the SWP-C provide? +
4. Is the SWP-C torque rating different from SWP-A or SWP-B? +
5. How quickly can I receive an SWP-C 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]
