SWP-A Long Flexible Universal Joint Couplings
The SWP-A Long Flexible Universal Joint Coupling is a split axletree spider-type cardan shaft combining extended installation length with a built-in telescoping sleeve (Ls 50–230 mm). Covering gyration diameters 160–640 mm and nominal torques 16–1 250 kN·m, it delivers simultaneous axial and angular misalignment compensation (≤10°) — ideal for rolling mills, paper refiners, crane drivetrains, and sugar mill crushers across Australian heavy industry.
SWP-A Long Flexible Universal Joint Couplings — Product Overview
The SWP-A Long Flexible Universal Joint Coupling is a split axletree, spider-type cardan shaft designed for heavy-duty power transmission between two non-collinear shafts. Unlike its short-body counterpart (SWP-B) or the rigid fixed-length variants (SWP-C/D), the SWP-A combines an extended overall installation length with a built-in telescoping sleeve that accommodates axial displacement of 50 mm (D=160) up to 230 mm (D=640). This dual compensation capability — angular and axial — makes it the preferred choice wherever shaft centre distances vary under load or thermal expansion must be absorbed without transmitting destructive axial forces to connected bearings.
The coupling operates on the classic Hooke's joint (Cardan joint) principle: two yokes connected through a cross-shaped spider transmit rotation across angular offsets of up to ≤10° (types A–F). The split axletree housing allows rapid field disassembly for spider replacement without dismounting the connected machines — a critical advantage in Australian mining and steel operations where unplanned downtime carries high per-hour cost penalties.
Gyration diameters span 160 mm to 640 mm, with nominal torques from 16 kN·m to 1 250 kN·m and fatigue (weary) torques from 8 to 630 kN·m. This range covers the full spectrum from medium mill auxiliary drives through to primary roughing stand drives in hot strip mills.
Primary industries served: Hot and cold rolling mills, heavy plate mills, tube mills, crane and hoist drivetrains, large paper & pulp refiners, sugar mill crushers, and cement kiln auxiliary drives — all sectors prevalent across Queensland, New South Wales, and Western Australia's resource and manufacturing corridors.
Australian market context: Equipment downtime in Australian mineral processing and steel operations routinely exceeds AUD 15,000–50,000 per hour. The SWP-A's in-situ spider replacement feature and long telescoping stroke mean maintenance windows are shorter and shaft removal is rarely required, directly translating to measurable OPEX savings.
Technical Specifications
| Type | D (mm) | Tn (kN·m) | Tf (kN·m) | Ls (mm) | β | Lmin (mm) | D1 js11 | D2 H7 | D3 | E | E1 | b×h | h1 | L1 | n–d | I Lmin (kg·m²) | ΔI /100mm | G Lmin (kg) | ΔG /100mm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SWP160A | 160 | 16 | 8 | 50 | ≤10 | 660 | 140 | 95 | 114 | 15 | 4 | 20×12 | 6 | 85 | 6–13 | 0.13 | 0.0055 | 47 | 2.1 |
| SWP180A | 180 | 20 | 10 | 60 | ≤10 | 752 | 155 | 105 | 121 | 15 | 4 | 24×14 | 7 | 95 | 6–15 | 0.22 | 0.0072 | 60 | 2.3 |
| SWP200A | 200 | 31.5 | 16 | 70 | ≤10 | 823 | 175 | 125 | 127 | 17 | 5 | 28×16 | 8 | 110 | 8–15 | 0.37 | 0.0114 | 81 | 3.4 |
| SWP225A | 225 | 40 | 20 | 76 | ≤10 | 933 | 196 | 135 | 152 | 20 | 5 | 32×18 | 9 | 130 | 8–17 | 0.63 | 0.029 | 109 | 6.6 |
| SWP250A | 250 | 63 | 31.5 | 80 | ≤10 | 978 | 218 | 150 | 168 | 25 | 5 | 40×25 | 12.5 | 135 | 8–19 | 1.02 | 0.0407 | 147 | 7.3 |
| SWP285A | 285 | 90 | 45 | 100 | ≤10 | 1133 | 245 | 170 | 194 | 27 | 7 | 40×30 | 15 | 150 | 8–21 | 2.17 | 0.0702 | 241 | 9.4 |
| SWP315A | 315 | 140 | 63 | 110 | ≤10 | 1250 | 280 | 185 | 219 | 32 | 7 | 40×30 | 15 | 170 | 10–23 | 3.86 | 0.1144 | 322 | 12.0 |
| SWP350A | 350 | 180 | 90 | 120 | ≤10 | 1380 | 310 | 210 | 245 | 35 | 8 | 50×32 | 16 | 185 | 10–23 | 6.66 | 0.1663 | 428 | 13.6 |
| SWP390A | 390 | 250 | 112 | 120 | ≤10 | 1495 | 345 | 235 | 273 | 40 | 8 | 70×36 | 18 | 205 | 10–25 | 11.53 | 0.2695 | 566 | 18.0 |
| SWP435A | 435 | 355 | 160 | 150 | ≤10 | 1710 | 385 | 255 | 299 | 42 | 10 | 80×40 | 20 | 235 | 16–28 | 21.81 | 0.3645 | 932 | 20.0 |
| SWP480A | 480 | 450 | 224 | 170 | ≤10 | 1910 | 425 | 275 | 351 | 47 | 12 | 90×45 | 22.5 | 265 | 16–31 | 38.04 | 0.7028 | 1294 | 28.0 |
| SWP550A | 550 | 710 | 315 | 190 | ≤10 | 2135 | 492 | 320 | 402 | 50 | 12 | 100×45 | 22.5 | 290 | 16–31 | 61.28 | 1.1842 | 1744 | 35.7 |
| SWP600A | 600 | 1000 | 500 | 210 | ≤10 | 2580 | 544 | 380 | 450 | 55 | 15 | 90×55 | 27.5 | 360 | 22–34 | 98.63 | 1.7159 | 2330 | 40.5 |
| SWP640A | 640 | 1250 | 630 | 230 | ≤10 | 2685 | 575 | 385 | 480 | 60 | 15 | 100×60 | 30 | 385 | 18–38 | 167.67 | 2.308 | 3153 | 48.3 |
Note: Gyration diameter D=315mm, installation length L=1800mm → SWP315A×1800. All dimensions in mm; Tn = nominal torque; Tf = weary (fatigue) torque; Ls = flex quantity (telescoping stroke); I = rotational inertia; G = weight.
Industry Applications
⚙️ Hot Strip & Plate Rolling Mills
Working condition: Continuous high-torque cycles, thermal elongation of roll necks, frequent roll changes requiring axial withdrawal.
Why SWP-A: The long telescoping stroke (up to 230 mm on D640) accommodates both thermal growth and roll-change extraction without uncoupling. Angular compensation of ≤10° handles housing misalignment from foundation settlement.
Customer benefit: Roll changes completed without full drive disconnection — reducing changeover time by up to 40% compared to rigid shaft solutions.
Paper & Pulp Refiners and Digesters
Working condition: Low-to-medium speed, continuous operation 24/7, corrosive washdown environments.
Why SWP-A: The split axletree design permits spider inspection during scheduled wash-downs without full driveline disassembly. The long body provides vibration damping that protects refiner plate bearings.
Customer benefit: Extended MTBF on refiner bearings; maintenance aligned with shift changes rather than unplanned outages.
⛏️ Sugar Mill Crushers & Cane Preparation
Working condition: Seasonal operation with harsh fibrous material ingress, significant shaft settlement under load.
Why SWP-A: Torque capacity to 1 250 kN·m covers the largest primary crusher drives. The telescoping stroke absorbs the 5–15 mm vertical roll drop common in worn crusher housings.
Customer benefit: No mid-season coupling replacement during crushing campaign — a critical requirement for Queensland sugar mills.
Port Crane & Heavy Hoist Drivetrains
Working condition: Cyclic loading, frequent reversals, outdoor marine environment.
Why SWP-A: Long installation length spans drum-to-gearbox distances standard in Australian bulk-handling cranes. Flexible coupling absorbs shock loads from rope engagement without transmitting peaks to gearbox input.
Customer benefit: Gearbox bearing life extended; lower lubricant consumption under reduced vibration.
How to Choose the Right Coupling
Selecting the correct SWP sub-type is the single most important decision in your coupling specification. The table below maps the key differentiators to help engineers and procurement teams choose with confidence.
| Feature | SWP-A (Long Flex) | SWP-B (Short Flex) | SWP-C (Short Non-Flex) | SWP-D (Long Non-Flex) | SWC Series | WSD Series |
|---|---|---|---|---|---|---|
| Overall Length | Long | Short | Short | Long | Medium | Compact |
| Axial Telescoping | ✅ Yes | ✅ Yes | ❌ No | ❌ No | Varies | ❌ No |
| Max Fold Angle | ≤10° | ≤10° | ≤10° | ≤10° | ≤15° | ≤35° |
| Torque Range | 16–1250 kN·m | 16–1250 kN·m | 16–1250 kN·m | 16–1250 kN·m | Limited | Limited |
| Spider Element | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | No spider | No spider |
| Best For | Rolling mills, long spans | Mining, compact spaces | Fixed axial loads | Long rigid spans | General industry | High angle offsets |
Key Parameter Selection Guidelines
Rated torque calculation: T_design = T_nominal × KA, where KA is the application service factor (typically 1.25–2.0 for rolling mills, 1.5–2.5 for crushers). Always select a coupling with Tn ≥ T_design. Do not select on fatigue torque Tf alone — it represents the cyclic endurance limit, not peak capacity.
Telescoping stroke selection: The SWP-A flex quantity Ls (50–230 mm depending on size) must exceed the maximum expected axial displacement including thermal growth, mounting tolerances, and roll change extraction distance. Add a 20% safety margin.
Angular misalignment: Sustained operation above 6° is not recommended for bearing longevity. Design the installation to run at ≤5° continuous, using the full 10° capacity only for transient events.
⚠️ Common Selection Errors
- Undersizing on peak torque: Rating a coupling to the motor nameplate torque without applying service factor KA results in premature spider failure within months of commissioning.
- Specifying short-body type (SWP-B) where axial movement exceeds Ls: If your application has thermal growth or sliding component exceeding the B-type stroke, only SWP-A or SWP-F provide the required flex quantity.
- Ignoring rotational inertia on variable-speed drives: For VFD-driven mills with rapid acceleration/deceleration, the coupling's rotational inertia (0.13–167.67 kg·m² across the SWP-A range) must be included in the drive sizing calculation or the VFD will be undersized.
- Assuming SWP-A and SWP-D are interchangeable: Both are long-body types but SWP-D has no telescoping stroke — specifying D where axial displacement exists will destroy the connected bearing housings.
Need help with your specific application parameters? Contact Our Engineers for a free selection review.
Why Choose GBC for Your SWP-A Supply
We manufacture SWP-A couplings to JB/T 3241-91 standard with over 25 years of continuous production experience and a dedicated export division serving Australia, New Zealand, Southeast Asia, and North America.
Manufacturing Process
All cross-spider assemblies undergo carburising heat treatment to 58–62 HRC case hardness. Yoke bores are precision-ground to ISO js11 (D1) and H7 (D2) tolerances, ensuring interference-fit integrity under high cyclic torque. Flange faces achieve Ra ≤1.6 μm surface finish for consistent bolt preload.
✅ Quality Control
Each coupling assembly passes dynamic balance testing per ISO 1940 Grade G6.3, torque proof-load test at 1.5× nominal torque, and dimensional verification with calibrated CMM equipment. A full material certificate and inspection report ships with every order.
After-Sales Support
We maintain a fast-turnaround replacement spider and sleeve programme. Emergency orders are processed within 24 hours. Our application engineers are available in AEST time zone for direct technical consultation, ensuring Australian customers receive same-business-day responses.
Certifications & Capacity
ISO 9001:2015 certified quality management system. Annual production capacity exceeds 50,000 coupling units. OEM supply to major rolling mill and mining equipment builders. Export documentation compliant with Australian import requirements.
Customer Reviews & Case Studies
Australia — Steel Rolling Mill, New South Wales
★★★★★
We replaced worn OEM couplings on our hot strip mill rougher stands with SWP-A units. The split axletree design allowed our maintenance crew to replace the spider cross during a 4-hour planned stop rather than a full weekend outage. Twelve months on, zero failures.
— Maintenance Engineer, NSW Steel Processing Facility
Germany — Plate Mill Rebuild, Ruhr Region
★★★★★
We ordered fourteen SWP480A couplings for a plate mill upgrade project. Dimensional accuracy was excellent — all flanges bolted up first time without shimming. Delivery in five weeks including sea freight to Hamburg.
— Procurement Manager, German Steel Equipment OEM
India — Sugar Mill Drive, Maharashtra
★★★★☆
Installed SWP315A on primary crusher drive. Handled the shock loading during cane season startup without any issues. The telescoping feature allowed easy alignment compensation when rolls bedded in during the first week. Would order again.
— Plant Engineer, Maharashtra Sugar Mill
Brazil — Paper Mill Refiner Drive, São Paulo
★★★★★
GBC SWP-A couplings have been running on our twin refiner drives for 18 months with no maintenance required. The long body style was essential to bridge the motor-to-gearbox gap without an intermediate bearing housing, saving significant installation cost.
— Chief Mechanical Engineer, São Paulo Paper & Pulp Plant
Frequently Asked Questions
What is the difference between SWP-A and SWP-B?
Both types feature a telescoping (flexible) sleeve, but the SWP-A has a longer overall body length (Lmin 660–2685 mm across the size range) while the SWP-B is shorter (Lmin 585–2780 mm for comparable sizes). The SWP-A is preferred when the distance between connected equipment demands a longer shaft span, or when the application requires more telescoping stroke than SWP-B provides. For compact installations where space is at a premium, SWP-B is more appropriate.
Can SWP-A be used in outdoor environments common on Australian mine sites?
Yes. The standard SWP-A coupling is suitable for outdoor and washdown environments when correctly lubricated. We recommend food-grade or heavy-duty lithium-complex grease for outdoor mine sites. Optional stainless-steel fasteners and additional corrosion-protective coating can be supplied for coastal and highly corrosive environments. Specify your site conditions when ordering for appropriate material recommendations.
How do I calculate the correct Ls (telescoping stroke) for my application?
The required Ls must exceed: (1) maximum thermal axial growth of connected shafts, (2) mounting assembly tolerance, (3) any operational axial float of connected bearings. Sum these three values and add a 20–25% safety margin. The SWP-A provides Ls from 50 mm (D160) to 230 mm (D640). If your calculated required stroke exceeds the SWP-A values for your torque range, consider the SWP-F large flex type, which offers greater telescoping stroke in the same diameter range.
What is the lead time for SWP-A couplings and can they be expedited?
Standard sizes (D160–D390) are typically held in semi-finished stock and can be completed and dispatched within 10–15 business days of order confirmation. Larger sizes (D435–D640) require 3–5 weeks production time. For urgent requirements, we offer an expedited production programme at a surcharge — contact our sales team with your timeline and we will confirm feasibility within 24 hours. Sea freight to Australian ports (Melbourne, Sydney, Brisbane, Fremantle) typically adds 18–25 days transit time.
What lubrication is required and what is the re-greasing interval?
The cross-spider needle bearings and telescoping sleeve splines require NLGI #2 lithium-complex or equivalent grease. For rolling mill applications running at elevated temperatures, a high-temperature grease rated to 150°C is recommended. Re-greasing interval: every 500–800 operating hours under normal conditions, or every 250–400 hours in high-temperature or contaminated environments. Each coupling is factory pre-greased and supplied with recommended lubrication specification on the product label.
Get Your SWP-A Coupling Quote Today
Ready to Source SWP-A Couplings for Your Project?
We support B2B procurement teams, OEM builders, and MRO purchasers across Australia and globally. Share your torque requirement, shaft diameter, and installation length — our engineers will confirm the correct type and size within one business day.
Request a Quote
Speak to an Engineer
ISO 9001:2015 Certified · Fast Sea Freight to Australia · OEM & MRO Supply
The SWP-A Long Flexible Universal Joint Coupling is a split axletree spider-type cardan shaft combining extended installation length with a built-in telescoping sleeve (Ls 50–230 mm). Covering gyration diameters 160–640 mm and nominal torques 16–1 250 kN·m, it delivers simultaneous axial and angular misalignment compensation (≤10°) — ideal for rolling mills, paper refiners, crane drivetrains, and sugar mill crushers across Australian heavy industry.
