Description
The SWP-B is the compact, short-flex variant of the SWP flanged-hub universal joint coupling family — same flanged interface, same 10-degree flex angle, and same material specification as SWP-A, but with a shorter intermediate shaft for installations where overall envelope is restricted. The compact design fits tight machine envelopes that cannot accommodate the long-flex SWP-A intermediate shaft length, while retaining the field-removable flanged hub connection.
SWP-B Specifications and Dimensional Range
The SWP-B range covers gyration diameters from 160 mm to 700 mm. Maximum flex angle is 10 degrees per joint, matching the SWP-A. Torque ratings match the SWP-A equivalents at any given gyration diameter. The defining dimensional difference is the Lmin minimum installed length — approximately 40 to 50 percent shorter than the SWP-A equivalent — with proportionally reduced axial travel range.
| Model | Gyration Ø D (mm) | Nominal Torque Tn (kN·m) | Fatigue Tn Tf (kN·m) | Flex Angle β (°) | Bore D₂ (mm) | Lmin (mm) |
|---|---|---|---|---|---|---|
| SWP160B | 160 | 16 | 8.0 | ≤10° | 20–95 | 330 |
| SWP180B | 180 | 20 | 10 | ≤10° | 30–105 | 370 |
| SWP225B | 225 | 63 | 31.5 | ≤10° | 40–125 | 440 |
| SWP250B | 250 | 90 | 45 | ≤10° | 50–140 | 480 |
| SWP285B | 285 | 160 | 80 | ≤10° | 60–155 | 540 |
| SWP315B | 315 | 250 | 125 | ≤10° | 65–160 | 580 |
| SWP350B | 350 | 400 | 200 | ≤10° | 80–185 | 620 |
| SWP390B | 390 | 560 | 280 | ≤10° | 90–200 | 680 |
| SWP450B | 450 | 800 | 400 | ≤10° | 100–230 | 750 |
| SWP500B | 500 | 1,000 | 500 | ≤10° | 120–260 | 820 |
| SWP550B | 550 | 1,250 | 625 | ≤10° | 130–280 | 890 |
| SWP700B | 700 | 2,500 | 1,250 | ≤10° | 200–350 | 1080 |
Axial travel range is approximately 50 to 80 mm depending on size class — substantially less than the SWP-A long-flex equivalent. Verify the expected operational axial movement (thermal growth, foundation settlement, load-induced shaft movement) sits within this envelope before specifying the short-flex variant.
SWP-B Short Flex Type Universal Joint Coupling – compact intermediate shaft, flanged hub. Ever Power Flange Couplings Australia Ltd.
What Distinguishes the SWP-B from Other Universal Joint Types
The SWP-B addresses installations where the SWP-A long-flex variant cannot fit within the available envelope. Compact industrial drive arrangements, restricted machine envelopes, and retrofit applications with limited overall length all benefit from the shorter intermediate shaft. The flanged hub connection method remains identical to SWP-A, supporting the same field-removable installation routines.
Functionally, the SWP-B behaves identically to the SWP-A at any given operating angle. Torque transmission, bearing loading, and flange interface specifications are identical. The only operational difference is the reduced axial travel range — installations with substantial thermal axial growth or load-induced shaft movement must specify the long-flex (SWP-A) variant despite its larger envelope footprint.
When Compact Envelope Justifies Short Flex
Many industrial pump, compressor, and conveyor drives operate with negligible axial shaft movement — the foundations are rigid, thermal growth is minimal, and load-induced shaft movement is within elastic foundation deflection. For these applications, the short-flex variant is the engineering default because it fits tight envelopes without the long-flex penalty. The decision criterion is the expected operational axial movement against the short-flex travel envelope.
Construction and Material Specification
Material and heat treatment specifications match the SWP-A: 35CrMo alloy steel forging, full quench-and-temper cycle, induction-hardened trunnion journals and spline teeth to HRC 58-64. The compact intermediate shaft uses the same spline geometry as the SWP-A equivalent — trunnion crosses and spline parts are interchangeable between the two variants at equivalent gyration diameter.
Sealed needle roller bearings are pre-lubricated at assembly. Flange bolt-on interface follows the standard industrial flange convention used across the SWP and SWC flange-type ranges. The shorter intermediate shaft simplifies field installation logistics in confined machine envelopes.
Lmin approximately 40 to 50 percent of SWP-A equivalent. Designed for tight installation envelopes where the long-flex variant cannot fit.
Same flanged hub interface as SWP-A. Field-removable installation without welding. Direct retrofit compatibility with most existing SWP-A installations where shorter length is preferred.
Identical material and heat treatment to SWP-A. Trunnion cross and spline parts interchangeable across the SWP-A and SWP-B variants at any given size.
Pre-lubricated at assembly with operating-temperature-appropriate grease. Same bearing specification as SWP-A. Lifetime sealing through design service life.
Same flex angle rating as SWP-A. Suitable for moderate-angle drives — typical industrial pump, compressor, and conveyor applications.
Full material traceability and dimensional inspection records available on request.
Industrial Applications Across Heavy Industry
SWP-B applications cluster around compact industrial drive arrangements where the flanged-hub benefit is required but the long-flex envelope cannot fit. Industrial pump and compressor drives, conveyor head drives, and retrofit applications with restricted overall length all match this profile.
Compact Industrial Pump and Compressor Drives
Large industrial centrifugal pumps and reciprocating compressor drives with restricted overall envelope between motor output and driven equipment input specify SWP-B for the combination of field-removable flanged hub and compact installed length. Process plant pump drives where adjacent equipment limits the available coupling envelope routinely use this industrial shaft coupling variant.
Retrofit Applications and Conveyor Drives
Retrofit applications where existing equipment cannot accommodate a long-flex universal coupling specify SWP-B as the engineering substitute. Belt conveyor head drives with restricted envelope between gearbox output and head pulley shaft also commonly use the compact variant. The bolt-on flanged installation supports periodic removal for conveyor maintenance without disturbing the gearbox or pulley mounting.
SWP-B compact yoke assembly – shorter intermediate shaft for restricted-envelope installations.
Selecting the Correct SWP-B Size for Your Drive
Choose SWP-B when the installation envelope cannot accommodate the SWP-A long-flex equivalent but the application still requires flanged hub field-removability. Verify the expected operational axial movement sits within the compact axial travel envelope. For applications with substantial axial movement, the long-flex (SWP-A) variant is the safer specification.
Verify flange interface dimensions match the SWP-B hub specifications. Where the existing flange interface is non-standard, custom hub machining is available from our Sydney facility within standard production lead times.
Installation, Operation, and Maintenance Best Practice
Installation follows the SWP-A workflow with simplified handling because the compact assembly is easier to position in confined envelopes. Bolt torque sequencing and locking compound application are identical to the SWP-A procedure.
Confirm available envelope matches or exceeds the SWP-B installed dimension. Verify existing flange interface dimensions match SWP-B hub specifications.
Lift coupling into position. Engage the pilot register of each hub with the corresponding shaft flange. Verify smooth engagement without interference.
Before completing bolt torque, verify the compact splined intermediate shaft moves through its full axial travel range. Confirm the installed length sits between Lmin and Lmax with safety margin.
Install all flange bolts in cross pattern. Torque to 30, 60, 100 percent of final value with calibrated wrench. Apply locking compound to bolt threads if specified.
Confirm operating flex angle through each joint sits within 10-degree per-joint rating with safety headroom.
Run at progressively increasing speed to full operating speed. Monitor vibration and bearing 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 short-flex flanged cardan shafts, Rexnord compact universal couplings, and SKF compact flanged industrial couplings. Provide OEM model code, gyration diameter, nominal torque, installed length, and flange interface dimensions for direct equivalent confirmation.
Where the original equipment manufacturer’s compact universal joint coupling is no longer available, the SWP-B provides the most direct functional replacement option. Cross-reference confirmation and any necessary custom flange machining are handled by our Sydney engineering team within standard production lead times.
Why Choose Ever Power Australia
Ever Power Flange Couplings Australia Ltd. stocks the commonly specified SWP-B sizes at our Condell Park warehouse for same-day dispatch on stock-confirmed orders. The compact short-flex variant is particularly important for retrofit applications where the original OEM equivalent is no longer available — our cross-reference work identifies the appropriate Ever Power match 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-B rather than SWP-A? +
2. Is the SWP-B torque rating the same as SWP-A? +
3. What is the axial travel range of the SWP-B? +
4. Can I retrofit an SWP-B in place of an existing flanged universal coupling? +
5. How quickly can I receive an SWP-B 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]
