Description
SL460 Heavy-Industrial Cross-Slider Oldham Coupling — The Apex of the SL Family for Main Ship-Propulsion and Major Mine-Hoist Drives
The SL460 industrial Oldham coupling stands at the apex of the SL family — the largest, heaviest, and highest-torque cross-slider Oldham coupling in Ever-power’s standard catalogue. At 63 000 N·m rated torque (nearly twice the SL400 below it), 460 mm hub OD, single 200 mm shaft, 70 r/min permissible speed, and 560 kg total mass, the SL460 transmits approximately 460 kW of continuous mechanical power in the very-ultra-slow-speed, very-very-high-torque envelope. This is the duty class of main ship-propulsion shaft installations, primary mine-hoist main drives at major underground mining operations, the largest tier of mineral-mill main drives, and the most demanding major-capital-equipment slow-speed drives. The SL460 is a major capital asset in its own right — specification involves multi-week engineering review, integration into the host equipment’s design documentation, and full lifecycle-cost analysis spanning 30–40 year operational horizons.
The torque jump from 38 700 N·m (SL400) to 63 000 N·m (SL460) — approximately 63 % increase in a single catalogue step — reflects an engineering reality of major capital equipment: the discrete population of installations at the very top of the duty curve. There is no continuous tail of slightly-larger-than-SL400 equipment; rather, there is a step-discontinuity to the very largest mill main drives, main propulsion-shaft installations on the largest vessels, and primary hoist mains on the deepest underground operations. The SL460 is precisely sized for this discrete population — it is not an over-specified larger sibling to the SL400 but a different engineering proposition entirely, optimised for the strategic-asset role on the largest-scale industrial installations.
Specifications
| Parameter | Value |
|---|---|
| Model | SL460 |
| Nominal Torque (Tn) | 63 000 N·m |
| Permissible Speed (n) | 70 r/min |
| Bore (d) | 200 mm |
| Outside Diameter (D) | 460 mm |
| Hub Bore Diameter (D₁) | 300 mm |
| Overall Length (L) | 350 mm |
| Slider Plate Thickness (H) | 58 mm |
| Slider Clearance (S) | 1.0 mm |
| Moment of Inertia | 62.9 kg·m² |
| Mass | 560 kg |
| Radial Misalignment (Δy) | 8.0 mm |
| Angular Misalignment (Δα) | 0.5° |
| Axial Misalignment (Δx) | 7.2 mm |
| Shaft Engagement | Heavy taper-bushed |
| Lubrication | Grease (re-pack 4-monthly) |
Materials
ZG270-500 Cast-Steel Hubs (Catalogue Standard)
At the SL460 size and rating, ZG270-500 cast-steel is the catalogue-standard hub specification — not an upgrade option. Each hub masses approximately 260 kg. The cast-steel matrix delivers tensile strength (≥500 MPa), fracture toughness, and fatigue-endurance margin that QT500/QT600 ductile-iron alone cannot provide at this duty class. For exceptional safety-critical or aggressive shock-load applications (deep-shaft mine hoist, certain ship-class type-approvals), an upgrade to certified-melt forging-quality steel (35CrMo or 42CrMo4) is documented and available through specialised engineering review.
58 mm Heavy-Duty Hardened Slider
58 mm thick — the heaviest in the SL family — induction-hardened 40Cr alloyed-steel cross-slider standard at this size class (45-steel is no longer the standard at this duty class). Slider masses approximately 65 kg with pre-machined heavy-duty lifting-eyelet provisions (M24 threaded). For severe abrasive deployments, hardfaced tungsten-carbide overlay variant is offered. For safety-critical hoist-main and ship-propulsion-main installations, 42CrMo4 fully heat-treated alloy slider with documented fatigue-endurance certification is the engineering-preferred specification.
Heavy-Industrial Taper-Bush Mounting
Mounting via super-heavy-duty locking-assembly families designed for the 200 mm bore / 300 mm hub-bore-diameter envelope: Trantorque GT-Heavy 250 series, RINGFEDER 7012 super-heavy-bore, KTR-Clampex 250/300 series. Engineering-supplied installation packets include detailed torque-sequence diagrams, locking-bolt-tightening cycles with intermediate verification steps, and post-installation strain-gauge verification protocols for safety-critical applications. All locking-bolt hardware is certified-traceability standard.
The Apex: Engineering for the Largest Industrial Drives
The SL460 occupies a unique position in the Oldham-coupling design space. At 63 000 N·m and 560 kg, it competes directly with major gear couplings, large diaphragm couplings, and major flexible-disc-pack designs at the very top of the industrial-coupling market. None of these competitors offer the SL460’s 8.0 mm parallel-misalignment envelope, its field-replaceable slider architecture, or its 30-year part-availability commitment. None offer the gradual, inspectable, predictable failure mode that the cross-slider architecture has carried consistently from the smallest SL family member to this apex. And none offer the design-margin documentation, FMEA framework, and engineering-support depth that Ever-power has built around the SL460 specifically for major capital-equipment installations.
For the integrator specifying a coupling at this scale, the SL460 represents the convergence of architectural decisions that have proven themselves across the entire SL family. The cross-slider mechanical design absorbs misalignment without storing elastic-strain energy, eliminating the catastrophic-failure mode that disc-pack and elastomer-spider architectures cannot escape. The cast-steel hub material delivers the shock-load endurance margin that grey-iron and ductile-iron cannot match at this rating. The 4-monthly grease-repack schedule maintains lubrication-film integrity at the substantial slider sliding velocities of routine misalignment operation. And the 30-year part-availability commitment matches the design-life expectation of the major capital equipment in which the SL460 is typically deployed. The combined architectural-and-commercial offering has kept the SL460 on equipment specifications across the most demanding installations in the global industrial market.
For broader engineering discussion of strategic-asset coupling specification at this scale, see Ever-power’s senior strategic-asset engineering portal.
Industry Applications
Main Ship-Propulsion Shaft
Main propulsion-shaft installations on large commercial vessels — typically inserted in the intermediate-shaft section between the gearbox output and the propeller-shaft section. Marine type-approval (LR, DNV, ABS, BV, CCS) supported through engineering review.
⛏️ Major Mine-Hoist Main Drives
Primary hoist main-drive couplings on deep-shaft underground mining installations — gold, copper, platinum, uranium, and other major-metal operations. Zero-backlash transmission and gradual failure mode support stringent safety-case requirements.
Largest Cement-Kiln Main
Main-drive coupling on the largest tier of cement-kiln rotating-section drives — large dry-process kilns at the upper end of plant-capacity envelope. Substantial misalignment tolerance absorbs full kiln-shell thermal-expansion profile.
⛰️ Largest Minerals-Mill Main
Main-drive couplings on the largest SAG and autogenous-mill installations in primary minerals-processing — top-tier major-capacity mills at the upper end of installed-base capacity globally.
Major Hydropower Main
Major main-drive applications on large hydropower-station main-machinery installations — gate-actuator main, main-intake auxiliary, and large diversion-flow control drives. 50-year design-life alignment with major-hydro asset profile.
⚡ Major Power-Generation Main
Main boiler-feed pump and major condenser-cooling pump applications on major thermal-power-station and combined-cycle plant infrastructure at the top of plant-capacity envelope. 30+ year design life with infrequent overhaul access.
Why Choose Ever-power
Quality & Compliance
SL460 production runs under ISO 9001:2015 with full cast-steel melt-traceability and forged-component certification where applicable. Documentation pack covers RoHS, REACH, CE conformity, comprehensive FMEA documentation, 30–50 year fatigue-endurance analysis, shock-load profile compatibility statements, and material-property certification per heat. Marine type-approval support for all major class societies. Mining safety-case integration tailored to regulatory regime. Hydropower industry-specific compliance documentation for major-utility customers.
Customisation
Catalogue bore 200 mm; custom-bore variants from 190 mm to 215 mm produced under engineering review with 8-week lead time. ZG270-500 cast-steel standard; 35CrMo or 42CrMo4 forging-quality variants for safety-critical applications. 42CrMo4 fully heat-treated alloy-slider variant with documented fatigue certification. Heavy-bore taper-bushed mounting via certified locking-assembly families. Hardfaced tungsten-carbide slider variant for severe abrasive environments. Engineering-led custom-design for non-catalogue bore-and-misalignment combinations on enquiry.
Apex Strategic-Asset Aftermarket
SL460 slider plates and alloy variants stocked for 5-business-day shipment (longer than smaller couplings owing to substantial slider mass and specialised heat-treatment requirement). Mass per coupling 560 kg; sea-freight in custom-fabricated welded-steel transport cradle with multi-layer shock-absorbing internal packaging. English-speaking engineering desk responds within 24 hours. 30-year part-availability commitment for slider plates and consumables. On-site engineering supervision available for all major installations.
Customer Reviews & Case Studies
★★★★★
Suriname — Bauxite-Mining Operation
Used in: Primary minerals-mill main-drive coupling on a major bauxite-mining concentrator complex.
Feedback: “Specified the SL460 with ZG270-500 cast-steel hubs and 42CrMo4 heat-treated alloy slider after the most rigorous engineering qualification we have ever conducted on a coupling specification. Ten years of three-shift continuous duty without unplanned events. The 30-year part-availability commitment was the single most important factor in our capital-equipment specification approval. Best major-capital-asset coupling decision we have made on this site.”
★★★★★
Iraq — Major Cement-Production Facility
Used in: Major cement-kiln main-drive coupling on a 3.5 Mt/y dry-process cement plant.
Feedback: “Extreme-ambient operation (recurring 55+ °C summer days) and continuous-production duty at full plant capacity. The SL460 with ZG270-500 cast-steel hubs, synthetic high-temperature grease, and IP54 sealed coupling guard has handled 7 years of three-shift production without unplanned events. Kiln-section design relied on the documented 30-year fatigue-endurance analysis to qualify the coupling against our extended plant design-life specification. Excellent strategic-asset specification decision.”
★★★★☆
Yemen — Major Port-Terminal Reclaimer
Used in: Main slewing-drive coupling on a major bulk-cargo port terminal reclaimer machine.
Feedback: “Coastal-salt ambient combined with continuous heavy-cargo duty had been the design challenge for our terminal expansion. The SL460 with cast-steel hubs, hardfaced slider, and sealed coupling guard has handled 5 years of three-shift duty without unplanned events. Knock one star only because the initial transport logistics for the 560 kg coupling to our specific port location required significant pre-planning — engineering supported us through the logistics-coordination process but it consumed substantial pre-installation calendar time. Operationally outstanding.”
Frequently Asked Questions
Why is permissible speed only 70 r/min?
At 460 mm OD, even 80 r/min would produce outer-rim sliding velocity of 1.93 m/s — at the upper edge of the optimal envelope for grease-lubricated metallic interfaces in continuous-production duty. The 70 r/min limit reduces this to 1.7 m/s, maintaining lubrication-film integrity over multi-decade service intervals. For applications requiring sub-rated speeds (typically 40–70 r/min for major mill and propulsion-shaft installations), the SL460 operates at full design margin throughout its envelope.
What is the documented design life and fatigue analysis horizon?
Documented design life for the SL460 in typical major capital-equipment continuous-production duty is 30+ years for the cast-steel hub section, with slider replacement at 12–15 year intervals during major plant or vessel overhauls. Fatigue analysis is conducted to 50-year horizon for installations where regulatory or commercial requirements specify extended design-life. Field service track record includes installations now passing 25+ years of continuous duty with original cast-steel hubs and 2–3 slider replacements.
How is the SL460 handled and shipped at 560 kg?
Shipping is in a custom-fabricated welded-steel transport cradle with multi-layer shock-absorbing internal packaging. Cradle masses approximately 90 kg empty; gross shipping mass 650 kg. Installation requires 5-ton or larger overhead-crane capacity, with each hub at 260 kg requiring substantial hoist support during sub-assembly. Pre-machined heavy-duty lifting-eyelet provisions (M24 threaded) on both hub-faces and slider plate are standard. Installation typically requires a 2-day commissioning window for a competent crew with engineering supervision.
Is on-site engineering supervision included with the SL460?
For the SL460 specifically, on-site engineering supervision during installation and initial commissioning is offered as standard inclusion for first-time customers and for installations in safety-critical applications (mine-hoist main, ship-propulsion main). For subsequent SL460 deployments at the same customer site, supervision can be omitted at the customer’s option subject to documented in-house competency. Supervision includes installation oversight, post-installation strain-gauge verification (for safety-critical applications), and equipment-handover documentation.
What is the production lead time for a new SL460 order?
Standard SL460 production lead time is 14 weeks from confirmed PO, reflecting the substantial cast-steel hub production cycle and specialised heat-treatment requirements. For customers requiring expedited delivery (typically major-vessel mid-life refit, emergency mill-main replacement), expedited production at 9-week lead time is available at appropriate cost premium subject to production-schedule availability. Marine type-approval, when required, adds 12–16 weeks to the standard lead time.
Quote SL460 — The Apex of the SL Family
For main ship-propulsion shaft, primary mine-hoist main, major-tier cement-kiln main, major minerals-mill main, and major hydropower main applications in the 460 kW ultra-slow-speed power class, the SL460 is the apex strategic-asset specification of the SL family. Browse the wider SL series catalogue, read about Ever-power’s apex strategic-asset capability, or move directly to a major-capital-equipment enquiry below.
