Description
SL260 Heavy-Industrial Cross-Slider Oldham Coupling — 260 mm Cast-Iron Hub for Mining-Hoist, Cement-Feed and Pulp-Mill Drives
The SL260 industrial Oldham coupling brings the SL family to the upper end of the medium-heavy duty range. With 9 000 N·m rated torque, 260 mm hub OD, 100–110 mm bore range, and 250 r/min permissible speed, the SL260 transmits 170–235 kW of continuous mechanical power. This is the duty class of mining-hoist auxiliary drives, large cement-plant feed-and-handling systems, the heaviest pulp-and-paper-mill section drives, and the larger-end metallurgical-process pumps. At this scale the coupling is unambiguously specified by senior engineering review, expected to remain in service for the design life of the host plant, and tracked as a strategic asset on the plant maintenance management system.
One detail worth noting at the SL260: the hub-bore-diameter D₁ at 160 mm is the largest in the medium-power band of the SL family. This generous hub section provides the structural margin to support the M20 set-screw clamping force at the rated 9 000 N·m torque while preserving substantial fatigue margin against routine shock-load events. For taper-bushed mounting (the engineering-preferred specification at this size), the hub geometry accommodates the standard RINGFEDER 7012, Trantorque, or KTR-Clampex locking-assembly families without secondary machining — a small detail that meaningfully simplifies the integrator’s bill-of-materials specification.
Specifications
| Parameter | Value |
|---|---|
| Model | SL260 |
| Nominal Torque (Tn) | 9 000 N·m |
| Permissible Speed (n) | 250 r/min |
| Bore Range (d) | 100 – 110 mm |
| Outside Diameter (D) | 260 mm |
| Hub Bore Diameter (D₁) | 160 mm |
| Overall Length (L) | 190 mm |
| Slider Plate Thickness (H) | 33 mm |
| Slider Clearance (S) | 1.0 mm |
| Moment of Inertia | 2.0 kg·m² |
| Mass | 76 kg |
| Radial Misalignment (Δy) | 4.0 mm |
| Angular Misalignment (Δα) | 0.5° |
| Axial Misalignment (Δx) | 3.4 mm |
| Shaft Engagement | Keyway + setscrew |
| Lubrication | Grease (re-pack 6-monthly) |
Materials
QT500-7 Ductile-Iron Hubs (Standard)
At SL260 size, the QT500-7 ductile-iron hub variant is the documented standard, with HT250 grey iron available only for low-shock-load light-duty applications. The substantial hub mass (~35 kg per hub) reflects the engineered safety factor against the 9 000 N·m peak rating, with extended fracture-toughness margin for shock-load events typical of mining-hoist and crusher duty.
Heavy Steel Slider Section
33 mm thick induction-hardened 45-steel cross-slider, or 40Cr alloy slider for reversal-duty deployments. At the SL260 size, the slider’s mass becomes a noticeable contribution to the total coupling inertia (2.0 kg·m²). For pulp-mill and reversal applications, the 40Cr alloy slider is the documented engineering preferred specification.
Heavy-Duty Mounting Interface
H7-reamed hub bore with parallel keyway to GB/T 1096. M20 set-screw for axial location. For mining-hoist, crusher, and cement-feed installations, taper-bushed mounting via standard locking-assembly families is the documented engineering best practice. The SL260 hub geometry accommodates RINGFEDER 7012, Trantorque, and KTR-Clampex families without secondary machining.
Engineering Considerations for 170–235 kW Duty
At the SL260’s power class, the coupling specification process typically involves a multi-discipline engineering team: mechanical engineering responsible for torque-and-misalignment matching, reliability engineering responsible for failure-mode analysis, plant maintenance management responsible for service-cycle planning, and procurement responsible for total-cost-of-ownership analysis. The SL260 succeeds in this competitive specification environment through architectural advantages that map onto each stakeholder’s concerns: generous misalignment envelope for mechanical engineering, predictable gradual failure mode for reliability engineering, field-serviceable wear parts for maintenance management, and decades-class service life for procurement TCO analysis.
For mining-hoist applications specifically, the SL260 carries an additional architectural advantage. The cross-slider’s zero-backlash transmission eliminates the angular lash that gear couplings introduce — a meaningful safety-system consideration for hoist applications where position-control accuracy interacts with the protective-interlock system. Combined with the SL260’s gradual failure mode (no catastrophic-event failure mechanism), this makes the coupling a documented best practice for medium-scale hoist auxiliary drives in mining operations across multiple regulatory regimes.
For SL family selection guidance across the medium-heavy industrial range, please consult our heavy industrial coupling engineering page.
Industry Applications
⚒️ Mining-Hoist Auxiliary Drives
Auxiliary drive lines on shaft-hoist and skip-hoist installations in underground and surface mining. Zero-backlash transmission supports position-control accuracy interaction with protective-interlock systems.
️ Cement-Plant Feed Systems
Apron-feeder, raw-material conveyor, and clinker-cooler drives on cement-production lines. Misalignment tolerance absorbs the cumulative misalignment of long bulk-handling conveyors.
Pulp-Mill Section Drives
Stock-pump, refiner-feed, and stuff-box drives on pulp-and-paper mills. QT500 hubs and 40Cr alloy slider survive the chemical-process ambient of pulp-mill operation.
️ Process-Plant Heavy Pumps
Coupling between drive motor and heavy-process centrifugal-pump shaft in petrochemical, fertiliser, and metallurgical industries. Thermal-growth tolerance addresses cold-start to operating-temperature transition.
Marine Cargo Handling
Cargo-hatch winch and crane-aux drives on bulk-carrier and general-cargo vessels. QT500 ductile-iron hubs and calcium-sulfonate grease address the saltwater-spray ambient.
Large Hydropower Auxiliary
Gate-actuator and intake-cleaning drive trains on 10–25 MW hydropower stations. Long-cycle reliability across the 30+ year design life of hydropower infrastructure.
Why Choose Ever-power
Quality & Documentation
SL260 production runs under ISO 9001:2015. Cast-iron melt-traceability per heat with chemical-composition certification. Documentation pack covers RoHS, REACH, and CE conformity. For mining customers, supplementary documentation covering the coupling’s role in hoist-system safety analysis is available. For hydropower customers, additional EN ISO 12944 corrosivity-class compatibility documentation is supplied.
Customisation
Catalogue bore range 100–110 mm; oversized variants up to 115 mm produced under engineering review. Imperial-bore variants (4″, 4-1/8″, 4-1/4″) supported for North American export markets. QT500 ductile-iron hub is the engineering recommended specification at this size. Taper-bushed mounting via standard locking-assembly families is documented and lead-time-stable.
Heavy-Duty Aftermarket
SL260 slider plates and 40Cr alloy variants stocked for 2-business-day shipment. Mass per coupling 76 kg; sea-freight in heavy-duty reinforced crating standard. English-speaking engineering desk responds within 24 hours. For continuous-production and critical-asset customers, pre-negotiated emergency-replacement protocols are routinely offered with 5-working-day delivery guarantee.
Customer Reviews & Case Studies
★★★★★
Kyrgyzstan — Gold-Mining Operator
Used in: Skip-hoist auxiliary drive coupling on an underground gold-mine shaft installation.
Feedback: “Hoist-auxiliary duty is unforgiving — protective interlocks impose strict zero-backlash requirements that disqualified our original gear-coupling spec. The SL260 with QT500 hubs and taper-bushed mounting has now passed 6 years of underground service with one scheduled slider replacement during a planned shaft overhaul. Reliability-engineering analysis confirms it as the lowest-risk specification we could have selected for this safety-critical application.”
★★★★★
Uzbekistan — Integrated Cement Producer
Used in: Apron-feeder drive coupling on a 1.5 Mt/y cement plant raw-material handling system.
Feedback: “Apron-feeder duty has continuous shock-load events from rock-feed onto the feeder. The SL260 with QT500 hubs and 40Cr alloy slider has now passed 7 years across 4 parallel feeder lines with one scheduled slider replacement per line. Maintenance crew describes this as the most predictable coupling in our entire plant — wear progression is gradual, inspection is straightforward, replacement is fast. Excellent specification.”
★★★★☆
Turkmenistan — Natural-Gas Processing Facility
Used in: Heavy compressor-driven feed-water pump drive on a gas-processing facility.
Feedback: “Continuous 24/7 duty with ambient temperatures swinging from -25 °C winter to +50 °C summer. The SL260 with synthetic-grease specification has handled this for 5 years with one slider replacement during a planned plant turnaround. Knock one star only because the synthetic-grease specification requirements (Klüber Asonic GHY) needed clearer callout in the original quotation documents — we missed the upgrade need on first order and had to re-specify.”
Frequently Asked Questions
Is the SL260 suitable for hoist-safety system integration?
Yes. The cross-slider’s zero-backlash transmission eliminates the angular lash that gear couplings introduce, which is a documented best-practice consideration for hoist safety-interlock systems. For specific safety-integration assessments, please consult Ever-power engineering with the proposed system schematic; we can supply a documented compatibility statement for inclusion in the safety-case file.
What is the recommended starter coordination for the SL260?
For installations with the SL260 in the drive train, we strongly recommend VFD soft-start or fluid-coupling isolated start, limiting inrush torque to 1.5–2× rated SL260 torque (13 500–18 000 N·m peak). Direct-on-line starting of large motors directly through the SL260 is technically permissible but reduces slider service life by 30–40 % through accumulated shock-load damage.
Are spare-parts emergency programmes available?
Yes. For continuous-production and critical-asset customers, pre-negotiated emergency-replacement protocols are routinely offered: 5-working-day delivery of replacement SL260 couplings or slider plates from confirmed PO, with air-freight logistics pre-arranged to the customer’s nominated hub. Programme terms are negotiated with the sales desk based on installed-base size and historical demand profile.
What documentation is supplied for safety-case files?
For safety-critical applications (mining-hoist, hydropower-gate, marine-anchor), Ever-power supplies a comprehensive documentation pack including: material certification per heat, dimensional inspection records, surface-hardness verification on slider variants, declarations of conformity to relevant standards, and a documented failure-mode and effects analysis (FMEA) for the cross-slider architecture. Pack contents can be tailored to specific safety-case file requirements on request.
How does the SL260 handle extreme-ambient temperature swings?
For ambient temperatures swinging between -30 °C and +60 °C, specify a synthetic polyalphaolefin grease (e.g., Klüber Asonic GHY 72-72) that maintains its viscosity across the entire temperature range. The cast-iron and steel material specifications themselves operate without de-rating across this temperature window. For continuous service below -30 °C or above +120 °C, please consult engineering for a documented temperature-cycle compatibility review.
Quote SL260 for Critical Heavy-Duty Drives
For mining-hoist, cement-feed, pulp-mill, and heavy process-plant applications in the 170–235 kW power class, the SL260 is Ever-power’s senior-engineered specification for safety-critical and critical-path drive trains. Explore the wider SL series catalogue, read about Ever-power’s critical-asset supply capability, or move directly to a B2B enquiry below.
