SWP-E Long Flexible Double Flange Universal Joint Couplings
The SWP-E Long Flexible Double Flange Universal Joint Coupling combines the extended telescoping body of SWP-A with a double flange yoke configuration for direct mounting to equipment with dual bolt-circle flange interfaces. Covering gyration diameters 160–640 mm, nominal torques 16–1 250 kN·m, and Lmin up to 3 170 mm, it is the standard replacement coupling for hot strip mill, wire rod mill, and plate leveller double flange spindle drives.
SWP-E Long Flexible Double Flange Universal Joint Couplings — Product Overview
The SWP-E Long Flexible Double Flange Universal Joint Coupling is the most specialised variant in the SWP series. It combines the long telescoping body of SWP-A with a double flange yoke configuration — an enlarged flange assembly with two concentric bolt circles or a wider bolt pattern — designed to interface directly with equipment that presents a matching double flange mounting face.
The double flange design is encountered on specific rolling mill gearbox outputs, large industrial drive stands, and heavy lifting machinery where the increased bolting surface distributes high torque loads across a greater flange diameter and bolt count, reducing individual bolt shear stress and improving coupling rigidity at the joint interface. This is particularly valuable at the upper end of the torque range — SWP640E carries 1 250 kN·m nominal — where single-yoke flange bolt circles would impose prohibitively high bolt loads.
Telescoping stroke (Ls) of 50 to 230 mm, fold angle ≤10°, and gyration diameters 160 to 640 mm are retained identically from SWP-A. The long body (Lmin 715–3 170 mm) positions SWP-E at the longest end of the SWP family, accommodating the extended shaft spans typical of heavy rolling mill main drives and large industrial machinery.
Key distinction from SWP-A: SWP-E Lmin values are consistently longer than SWP-A at the same diameter (e.g., SWP315E Lmin 1345 mm vs SWP315A at 1250 mm). This extended length accommodates the physical depth of the double flange assemblies. When selecting SWP-E, ensure your installation drawing reflects the longer minimum length.
Australian relevance: Double flange universal joint couplings are standard on imported European and Asian rolling mill equipment now present in Australian steel and wire rod plants. When these OEM couplings require replacement or upgrade, SWP-E provides the correct double flange interface in a locally supportable supply chain, eliminating dependence on single-source OEM replacement parts.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SWP160E | 160 | 16 | 8 | 50 | ≤10 | 715 | 140 | 95 | 114 | 15 | 4 | 20×12 | 6 | 85 | 6–13 | 0.15 | 0.0059 | 49 | 2.1 |
| SWP180E | 180 | 20 | 10 | 60 | ≤10 | 800 | 155 | 105 | 121 | 15 | 4 | 24×14 | 7 | 95 | 6–15 | 0.25 | 0.0072 | 69 | 2.3 |
| SWP200E | 200 | 31.5 | 16 | 70 | ≤10 | 880 | 175 | 125 | 127 | 17 | 5 | 28×16 | 8 | 110 | 8–15 | 0.42 | 0.0114 | 81 | 3.4 |
| SWP225E | 225 | 40 | 20 | 76 | ≤10 | 1000 | 196 | 135 | 152 | 20 | 5 | 32×18 | 9 | 130 | 8–17 | 0.75 | 0.029 | 108 | 6.6 |
| SWP250E | 250 | 63 | 31.5 | 80 | ≤10 | 1055 | 218 | 150 | 168 | 25 | 5 | 40×25 | 12.5 | 135 | 8–19 | 1.26 | 0.0407 | 179 | 7.3 |
| SWP285E | 285 | 90 | 45 | 100 | ≤10 | 1210 | 245 | 170 | 194 | 27 | 7 | 40×30 | 15 | 150 | 8–21 | 2.67 | 0.0702 | 285 | 9.4 |
| SWP315E | 315 | 140 | 63 | 110 | ≤10 | 1345 | 280 | 185 | 219 | 32 | 7 | 40×30 | 15 | 170 | 10–23 | 4.38 | 0.1144 | 375 | 12.0 |
| SWP350E | 350 | 180 | 90 | 120 | ≤10 | 1480 | 310 | 210 | 245 | 35 | 8 | 50×32 | 16 | 185 | 10–23 | 7.42 | 0.1663 | 488 | 13.6 |
| SWP390E | 390 | 250 | 112 | 120 | ≤10 | 1623 | 345 | 235 | 273 | 40 | 8 | 70×36 | 18 | 205 | 10–25 | 13.27 | 0.2695 | 662 | 18.0 |
| SWP435E | 435 | 355 | 160 | 150 | ≤10 | 1860 | 385 | 255 | 299 | 42 | 10 | 80×40 | 20 | 235 | 16–28 | 24.62 | 0.3645 | 1107 | 20.0 |
| SWP480E | 480 | 450 | 224 | 170 | ≤10 | 2122 | 425 | 275 | 351 | 47 | 12 | 90×45 | 22.5 | 265 | 16–31 | 42.81 | 0.7028 | 1302 | 28.0 |
| SWP550E | 550 | 710 | 315 | 190 | ≤10 | 2338 | 492 | 320 | 402 | 50 | 12 | 100×45 | 22.5 | 290 | 16–31 | 68.81 | 1.1842 | 2140 | 35.7 |
| SWP600E | 600 | 1000 | 500 | 210 | ≤10 | 2930 | 544 | 380 | 450 | 55 | 15 | 90×55 | 27.5 | 360 | 22–34 | 110.6 | 1.7159 | 2703 | 40.5 |
| SWP640E | 640 | 1250 | 630 | 230 | ≤10 | 3170 | 575 | 385 | 480 | 60 | 15 | 100×60 | 30 | 385 | 18–38 | 177.77 | 2.308 | 3719 | 48.3 |
Note: D=315mm, L=1800mm → SWP315E×1800. Lmin values exceed SWP-A equivalents due to double flange yoke depth. Ls = telescoping stroke (50–230 mm). ΔI and ΔG are incremental values per 100 mm length increase.
Industry Applications
️ Hot Rolling Mill Main Drives — Double Flange Gearboxes
Working condition: Very high torque (>500 kN·m on main stands), continuous high-cycle operation, thermal growth of roll necks and gearbox housing, OEM equipment with double flange gearbox outputs.
Why SWP-E: When the OEM gearbox presents a double flange output (two concentric bolt circles), SWP-E is the geometrically correct match. The double flange distributes torque-induced bolt loads over a greater contact area, reducing the risk of bolt fretting and flange face galling at extreme torque levels.
Customer benefit: Drop-in OEM replacement with standard interface; no gearbox modification required; full torque rating maintained.
Wire Rod & Bar Mill Finishing Stands
Working condition: High-speed, moderate torque, compact stands with double flange spindle interfaces, frequent roll guide changes.
Why SWP-E: Wire rod finishing stand spindle couplings with double flange interfaces require exact dimensional matching to OEM specifications. SWP-E provides the correct double flange geometry with the telescoping stroke to accommodate spindle wear and roll change extraction distances.
Customer benefit: Compatible with existing spindle stands without modification; standard SWP spider crosses enable shared spare parts with other SWP types in the same plant.
⚙️ Large Industrial Gearbox Driven Equipment
Working condition: Specialised gearbox configurations with double flange output shafts, medium-to-high torque, variable operating speed.
Why SWP-E: Custom industrial gearbox makers in Germany, Italy, and Japan routinely specify double flange output shafts for their high-torque products. When these are imported into Australian processing plants, SWP-E enables correct-interface coupling supply without reverting to expensive OEM-specific parts.
Customer benefit: OEM-independent replacement supply chain; reduced procurement lead time versus single-source OEM parts; cost-competitive pricing.
Heavy Plate Leveller Drives
Working condition: Very high torque per roll, bidirectional loading, frequent thickness changes requiring roll gap adjustment (axial movement compensation needed).
Why SWP-E: Plate leveller spindles with double flange interfaces and axial movement during roll gap adjustment are exactly the application SWP-E was engineered for. The combination of double flange mounting, long telescoping stroke, and high torque capacity at upper sizes covers even the most demanding leveller configurations.
Customer benefit: Complete spindle coupling solution for double flange leveller drives; no compromise on torque capacity or axial stroke versus OEM design.
How to Choose: SWP-E vs SWP-A
SWP-E selection is primarily driven by the interface geometry of the connected equipment. If your gearbox or machinery presents a double flange connection face, SWP-E is the required type. All other performance parameters (torque, angle, stroke) are evaluated the same way as for SWP-A.
| Selection Criterion | SWP-E Applies | SWP-A Applies Instead |
|---|---|---|
| Equipment flange interface | Double flange (two bolt circles or wide flange) | Standard single yoke flange |
| Shaft span requirement | Long (715–3170 mm) | Long (660–2685 mm) but SWP-E is longer |
| Axial displacement required | Yes (Ls 50–230 mm) | Yes — same stroke as SWP-E |
| Angular compensation | ≤10° (same as SWP-A) | ≤10° |
| OEM equipment replacement | OEM had double flange spindle | OEM had standard SWP-A type spindle |
Torque and Stroke Sizing — Same Method as SWP-A
Torque sizing for SWP-E follows the identical method as SWP-A: T_design = T_nominal × KA, where KA values range from 1.25 (smooth, steady load) to 2.5 (crusher, hoist with shock loading). Telescoping stroke Ls must exceed maximum axial displacement plus 20% safety margin. Nominal torques and fatigue torques are identical to SWP-A at each diameter — the double flange does not reduce torque capacity.
⚠️ SWP-E Specification Errors to Avoid
- Specifying SWP-E where SWP-A interface fits: The double flange configuration is only an advantage where the connected equipment has a matching double flange face. Specifying SWP-E for standard single-yoke applications adds unnecessary length, weight, and cost without benefit.
- Ignoring Lmin increase versus SWP-A: SWP-E Lmin values are 7–18% longer than SWP-A at the same diameter. If installation space is close to SWP-A Lmin, verify there is sufficient clearance before upgrading to SWP-E.
- Mismatching bolt circle dimensions: Double flange interfaces can vary between equipment manufacturers. Always confirm the bolt circle diameter, number of bolts, and bolt size of the connected equipment flange before ordering SWP-E — a dimension mismatch makes the coupling unusable without modification.
Have an OEM rolling mill or industrial drive with a double flange spindle coupling? Contact Our Engineers with your flange drawing and we'll confirm dimensional compatibility.
Why Choose GBC for SWP-E Supply
SWP-E is our premium rolling mill spindle coupling, engineered to OEM-equivalent quality for the most demanding double flange drive applications in steel and wire rod production worldwide.
Rolling Mill Engineering Expertise
We have supplied SWP-E double flange couplings as replacement parts and new-build components to rolling mills in China, India, Southeast Asia, and beyond for over 20 years. Our engineering team can cross-reference OEM coupling dimensions from mill drawings and confirm dimensional compatibility before order placement.
Flange Precision Manufacturing
Double flange yokes are machined on 5-axis CNC machining centres, with bolt hole true position held to ±0.05 mm versus nominal bolt circle. Flange faces are ground perpendicular to bore axis to ≤0.02 mm TIR. This precision ensures consistent bolt load distribution and eliminates the fretting that can arise from flange face runout in high-torque applications.
OEM Cross-Reference Service
We maintain a cross-reference database of major rolling mill OEM coupling dimensions (European, Japanese, and domestic makes). For replacement orders, submit your existing coupling part number or dimensional drawing and we will confirm the compatible SWP-E specification. This service eliminates trial-and-error procurement for plant maintenance teams.
Supply Chain Assurance
SWP-E components in sizes D160–D390 are maintained in semi-finished stock for fast assembly. Lead time for standard sizes: 10–20 business days. For larger sizes (D435–D640), 4–6 weeks. Emergency production slots available for critical plant outage situations. ISO 9001:2015 certified throughout.
Customer Reviews & Case Studies
Australia — Wire Rod Mill Spindle Replacement, South Australia
★★★★★
We urgently needed replacement spindle couplings for our finishing block drives — original OEM parts had a 16-week lead time. GBC matched our double flange dimensions from drawings and delivered SWP315E units in four weeks by air freight. Fit was perfect, no shimming required. Production resumed without further delay. This order saved our season.
— Plant Engineer, South Australian Wire Rod Mill
India — Hot Strip Mill Main Drive Replacement, Maharashtra
★★★★★
We cross-referenced our European OEM spindle couplings and ordered SWP480E as replacements. GBC confirmed dimensional compatibility before manufacturing. Installation went smoothly — the double flange bolt pattern matched exactly. Now 18 months in service on the rougher stand without maintenance issues. Significant cost saving over OEM pricing.
— Maintenance Manager, Maharashtra Hot Strip Mill
South Korea — Plate Leveller Drive Retrofit, Pohang
★★★★☆
Specified SWP390E for a leveller spindle upgrade. The double flange and telescoping stroke combination was exactly the design brief. Minor feedback: we had to request custom bolt hole sizes for our specific leveller flange — GBC accommodated this without issue. Good quality and professional technical support throughout.
— Project Mechanical Engineer, Korean Plate Mill
Turkey — Bar Mill Finishing Stand Overhaul, Istanbul Region
★★★★★
We purchase SWP-E couplings annually for our rolling mill overhaul programme. Quality is consistently excellent, dimensional repeatability from batch to batch is very good, and the GBC technical team is responsive when we have questions about material certification. They are our standard supplier for this component.
— Purchasing Manager, Turkish Steel Bar Mill
Frequently Asked Questions
How do I verify that SWP-E is dimensionally compatible with my existing double flange equipment?
The key dimensions to verify are: (1) bolt circle diameter (B.C.D.) — must match within ±0.5 mm; (2) number and size of flange bolts; (3) total flange outer diameter (for guard clearance); (4) D1 bore diameter and keyway dimensions. Submit your OEM coupling drawing or the equipment output flange drawing to our engineering team. We will cross-reference against the SWP-E flange specification and confirm compatibility or flag the specific dimensions that require custom machining. This cross-reference service is provided at no charge for genuine procurement enquiries.
Can SWP-E be supplied with one double flange end and one standard yoke end?
Yes. Asymmetric configurations — double flange on the machine side and standard yoke on the motor/gearbox side — are available as custom orders. This is common in retrofits where one end connects to an existing double flange machine while the other end connects to a standard gearbox or motor flange. Specify the required configuration clearly in your order enquiry, including bore dimensions and keyway details for each end. Lead time for asymmetric configurations may be 3–5 business days longer than standard symmetric SWP-E.
What is the difference in weight and inertia between SWP-E and SWP-A at the same size?
SWP-E is heavier and has higher rotational inertia than SWP-A at the same gyration diameter, due to the additional flange material and longer overall body. Example at D315: SWP315E weighs approximately 375 kg (inertia 4.38 kg·m²) versus SWP315A at 322 kg (inertia 3.86 kg·m²) — approximately 16% heavier and 13% higher inertia. This difference should be accounted for in drive inertia calculations, particularly for VFD-driven mills with frequent speed changes.
What greasing schedule is recommended for SWP-E in continuous rolling mill service?
For hot rolling mill main drive service (24/7 continuous, elevated ambient temperature): re-grease spider needle bearings every 250–400 operating hours; re-grease telescoping spline every 500 hours. Use high-temperature NLGI #2 lithium-complex grease rated to ≥150°C. Apply sufficient grease to purge old material from the bearing — grease purge visible from the opposite seal is confirmation of adequate application. For planned overhaul cycles, a full disassembly and re-bearing of spider crosses at 15,000–20,000 hours is typical in heavy rolling mill service.
Is SWP-E available with a flanged intermediate tube (SWP-E2 configuration)?
The standard SWP-E has a welded intermediate tube with double flange yoke ends as described in the JB/T 3241-91 specification. For modified configurations with flanged intermediate tube sections (enabling field length adjustment by inserting spacer rings), this is available as a custom engineering order. Please provide your required overall length range, torque and speed requirements, and flange interface drawings, and our engineering team will design and quote the appropriate configuration. This is relevant for applications where the shaft span may change during the equipment lifetime.
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Source SWP-E Double Flange Couplings for Your Rolling Mill or Industrial Drive
Whether you need a drop-in OEM replacement or a custom double flange spindle for a new-build project, our engineering team will match your dimensional requirements and deliver to your timeline. Submit your drawing or OEM part number for a same-day compatibility assessment.
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ISO 9001:2015 · Rolling Mill OEM Cross-Reference Service · Worldwide Export Including Australia
The SWP-E Long Flexible Double Flange Universal Joint Coupling combines the extended telescoping body of SWP-A with a double flange yoke configuration for direct mounting to equipment with dual bolt-circle flange interfaces. Covering gyration diameters 160–640 mm, nominal torques 16–1 250 kN·m, and Lmin up to 3 170 mm, it is the standard replacement coupling for hot strip mill, wire rod mill, and plate leveller double flange spindle drives.
