{"id":773,"date":"2026-06-23T09:46:59","date_gmt":"2026-06-23T09:46:59","guid":{"rendered":"https:\/\/oldhamcoupling.net\/product\/sl210-industrial-oldham-coupling\/"},"modified":"2026-06-24T08:47:41","modified_gmt":"2026-06-24T08:47:41","slug":"sl210-industrial-oldham-coupling","status":"publish","type":"product","link":"https:\/\/oldhamcoupling.net\/ar\/product\/sl210-industrial-oldham-coupling\/","title":{"rendered":"SL210 Industrial Oldham Coupling"},"content":{"rendered":"
\n

SL210 Heavy-Industrial Cross-Slider Oldham Coupling \u2014 210 mm Cast-Iron Hub for Mining, Slurry-Pump and Hydropower Drives<\/h2>\n

The SL210 industrial Oldham coupling<\/strong> takes the SL family across an important power threshold. At 5 000 N\u00b7m rated torque, 210 mm hub OD, 85\u201390 mm bore range, and 250 r\/min permissible speed, the SL210 transmits 90\u2013130 kW of continuous mechanical power. This duty class anchors primary mining-crusher auxiliary drives, large heavy-slurry pumps in mineral-processing plants, hydropower auxiliary trains, and the higher-power process-mixer outputs in heavy chemical and metallurgical industries. At this scale the coupling is unambiguously a critical-path asset \u2014 typically specified by senior engineering, reviewed by maintenance management, and expected to remain in service for the design life of the host equipment.<\/p>\n

One detail that engineers should note when comparing the SL210 against its smaller siblings: the slider clearance (S) increases to 1.0 mm at this size, up from 0.5 mm for SL170 and below. This reflects the increased thermal-expansion budget required at the higher torque level \u2014 the slider’s metallic sliding interfaces generate measurable heat during high-misalignment operation, and the larger clearance provides space for the slider to operate without binding under thermal expansion. The change is invisible to the integrator (assembly procedure is unchanged), but it underlines the engineering thought that goes into scaling the cross-slider architecture to higher power levels.<\/p>\n

Specifications<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nSL210<\/td>\n<\/tr>\n
Nominal Torque (Tn)<\/td>\n5 000 N\u00b7m<\/td>\n<\/tr>\n
Permissible Speed (n)<\/td>\n250 r\/min<\/td>\n<\/tr>\n
Bore Range (d)<\/td>\n85 \u2013 90 mm<\/td>\n<\/tr>\n
Outside Diameter (D)<\/td>\n210 mm<\/td>\n<\/tr>\n
Hub Bore Diameter (D\u2081)<\/td>\n130 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n160 mm<\/td>\n<\/tr>\n
Slider Plate Thickness (H)<\/td>\n33 mm<\/td>\n<\/tr>\n
Slider Clearance (S)<\/td>\n1.0 mm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n0.9 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Mass<\/td>\n45 kg<\/td>\n<\/tr>\n
Radial Misalignment (\u0394y)<\/td>\n3.4 mm<\/td>\n<\/tr>\n
Angular Misalignment (\u0394\u03b1)<\/td>\n0.5\u00b0<\/td>\n<\/tr>\n
Axial Misalignment (\u0394x)<\/td>\n2.6 mm<\/td>\n<\/tr>\n
Shaft Engagement<\/td>\nKeyway + setscrew<\/td>\n<\/tr>\n
Lubrication<\/td>\nGrease (re-pack 6-monthly)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"SL210<\/p>\n

Materials<\/h3>\n
\n
\n

HT250 or QT500 Cast-Iron Hubs<\/h4>\n

For mining and slurry-pump applications, the QT500-7 ductile-iron hub variant is the documented best practice. The spheroidal-graphite microstructure delivers approximately 3\u00d7 the fracture toughness of HT250 grey iron, addressing the dominant failure-risk vector in the routine shock-load environment of crusher and slurry-pump duty. Hub section thickness has been engineered with a 3\u00d7 safety factor against the 5 000 N\u00b7m peak rating.<\/p>\n<\/p><\/div>\n

\n

33 mm Heavy Steel Slider<\/h4>\n

The 33 mm thick cross-slider is the heaviest in the SL family below this size. Standard specification is induction-hardened 45-steel; 40Cr alloyed-steel variant is recommended for reversal duty and abrasive slurry-pump applications. The substantial slider section delivers effectively unlimited fatigue life under steady-state torque; replacement is driven entirely by wear of the sliding faces.<\/p>\n<\/p><\/div>\n

\n

Heavy-Industrial Shaft Mounting<\/h4>\n

H7-reamed bore with parallel keyway to GB\/T 1096. M20 set-screw for axial location. For crusher and slurry-pump applications specifically, taper-bushed mounting using locking assemblies is the documented engineering best practice \u2014 eliminating the keyway-shear failure mode under the routine shock-load profile of these installations. Locking assembly recommendations on engineering enquiry.<\/p>\n<\/p><\/div>\n<\/div>\n

Engineering Considerations for 90\u2013130 kW Duty<\/h3>\n

The transition from 55\u201385 kW to 90\u2013130 kW marks a real engineering threshold. At the lower power band, a coupling-related failure costs production hours; at the higher power band, it typically also damages downstream equipment, requires specialist intervention to restart, and may trigger unplanned process-chemistry events that take days to recover from. The selection criterion therefore tightens dramatically: not just “what is the cheapest coupling that meets the duty?” but “what is the most reliable coupling architecture, and how does its failure mode interact with the surrounding equipment?”<\/p>\n

The SL210’s answer is built into the architecture. The failure mode is gradual wear of an inspectable, replaceable, metallic slider. There is no elastomer to fatigue-crack, no spring-pack to lose preload, no precision-ground bellows to corrupt under shock load. When wear is detected during routine inspection, the slider is replaced during the next planned shutdown \u2014 typically a 90-minute task with the host equipment offline. Cast-iron hubs continue in service across multiple slider-replacement cycles, often spanning the entire installed life of the host equipment. This is exactly the failure profile that mining and process-plant maintenance planning depends on.<\/p>\n

For mining-crusher applications specifically, the SL210 is often specified in combination with a soft-start fluid coupling or VFD-controlled motor \u2014 combining the SL210’s gradual-failure mechanism with active inrush limiting to deliver the most reliable possible drive train. See Ever-power’s flexible coupling overview<\/a> for related selection guidance.<\/p>\n

\"SL210<\/p>\n

Industry Applications<\/h3>\n
\n
\n

\u26f0\ufe0f<\/span> Primary Mining-Crusher Auxiliary<\/h4>\n

Auxiliary drive lines on jaw crusher, gyratory crusher, and cone-crusher installations. Slider absorbs the shock loads of inhomogeneous rock-feed events without flexure of any metallic component.<\/p>\n<\/p><\/div>\n

\n

<\/span> Heavy Slurry-Pump Drives<\/h4>\n

Coupling between drive motor and heavy-duty slurry pump shaft on mineral-processing, sand-and-gravel, and tailings-management installations. QT500 hubs resist the corrosive ambient of acidic slurries.<\/p>\n<\/p><\/div>\n

\n

<\/span> Hydropower Auxiliary Trains<\/h4>\n

Trash-rake, gate-actuator, and governor-aux drives on small-to-medium hydropower installations. Cast-iron section absorbs debris-impact events without permanent damage.<\/p>\n<\/p><\/div>\n

\n

<\/span> Heavy Process Mixers<\/h4>\n

Reduction-output to impeller-shaft couplings on 100+ kW process mixers in chemical, petrochemical, and metallurgical industries. Misalignment tolerance absorbs the thermal-growth budget during start-up cycles.<\/p>\n<\/p><\/div>\n

\n

<\/span> Large Marine Auxiliary<\/h4>\n

Large bow-thruster auxiliary drives on ferries, harbour-service vessels, and offshore-supply ships. QT500 hub variant for marine corrosion resistance.<\/p>\n<\/p><\/div>\n

\n

<\/span> Heavy Conveyor Head Drives<\/h4>\n

Head-pulley and drive-shaft couplings on 1000\u20131400 mm wide overland and quarry conveyors. Slider absorbs the high inrush torque of conveyor start-up under loaded conditions.<\/p>\n<\/p><\/div>\n<\/div>\n

Why Choose Ever-power<\/h3>\n
\n

Quality & Documentation<\/h4>\n

SL210 production runs under ISO 9001:2015<\/strong>. Full melt-traceability per cast-iron heat with chemical-composition certification. Documentation pack includes RoHS<\/strong>, REACH<\/strong>, and CE<\/strong> conformity declarations. For mining customers, supplementary documentation covering NACE MR0175 sour-service material compatibility (with QT500 stainless variant) is available. For hydropower deployments, additional EN ISO 12944 corrosivity-class C5 documentation is supplied on request.<\/p>\n

Customisation<\/h4>\n

Catalogue bore range 85\u201390 mm; oversized variants up to 95 mm and undersized to 80 mm produced under engineering review. Imperial-bore variants (3-3\/8″, 3-1\/2″, 3-5\/8″) supported for North American export markets. QT500-7 ductile-iron hub upgrade is documented and lead-time-stable. Taper-bushed mounting via standard locking-assembly families is the recommended approach for crusher and slurry-pump installations.<\/p>\n

Heavy-Industrial Aftermarket<\/h4>\n

SL210 slider plates stocked for 2-business-day shipment under part SL210-SLIDER. 40Cr alloy reversal-duty variant and bronze CuSn10 electrical-isolation variant available within 1 week. Mass per coupling 45 kg; sea-freight standard in heavy-duty crating. English-speaking engineering desk responds within 24 hours<\/strong>.<\/p>\n<\/div>\n

\"Ever-power<\/p>\n

Customer Reviews & Case Studies<\/h3>\n
\n
\n

\u2605\u2605\u2605\u2605\u2605<\/p>\n

Tunisia \u2014 Phosphate Mining Operation<\/h4>\n

Used in:<\/em> Tailings slurry-pump drive coupling on a phosphate-beneficiation plant.<\/p>\n

Feedback:<\/em> “Acidic slurry environment and intermittent solids loading had been catastrophic for every flexible coupling we tried. The SL210 with QT500 ductile-iron hubs and 40Cr alloy slider has now passed 5 years of continuous duty with one scheduled slider replacement during a planned mill shutdown. Total ownership cost is the lowest of any flexible coupling in our maintenance database.”<\/p>\n<\/p><\/div>\n

\n

\u2605\u2605\u2605\u2605\u2605<\/p>\n

Morocco \u2014 Small Hydropower Generation<\/h4>\n

Used in:<\/em> Trash-rake auxiliary drive on a 5 MW run-of-river hydropower installation.<\/p>\n

Feedback:<\/em> “Trash-rake duty includes routine debris-impact events that catastrophically failed our original disc-pack coupling specification within 30 months. The SL210 has now passed 6 years of duty with no failure events. Slider plate shows acceptable wear and is scheduled for replacement during the next major plant overhaul. Excellent specification for hydropower auxiliary duty.”<\/p>\n<\/p><\/div>\n

\n

\u2605\u2605\u2605\u2605\u2606<\/p>\n

Ethiopia \u2014 Quarrying & Aggregate Operation<\/h4>\n

Used in:<\/em> Auxiliary drive coupling on a primary jaw crusher in basalt-aggregate production.<\/p>\n

Feedback:<\/em> “Inhomogeneous basalt feed produces routine 1.5\u20132\u00d7 rated-torque shock events. The QT500 hub variant has handled this for 4 years with one scheduled slider replacement. Knock one star only because the lead time for emergency replacement slider during an unscheduled wear event was 8 days \u2014 engineering had quoted 5 working days. Otherwise excellent.”<\/p>\n<\/p><\/div>\n<\/div>\n

Frequently Asked Questions<\/h3>\n
\nWhy does the slider clearance increase to 1.0 mm at the SL210 size?<\/summary>\n

At higher torque levels the slider’s metallic sliding faces generate measurable heat during high-misalignment operation. The 1.0 mm clearance provides space for the slider to operate without binding under thermal expansion. Below the SL210 size, lower torque levels produce less heat, and the 0.5 mm clearance is adequate.<\/p>\n<\/details>\n

\nWhat is the recommended grease-repack interval at this size?<\/summary>\n

For SL210 and larger SL family members in heavy industrial duty (mining, slurry-pump, hydropower), a 6-month grease-repack interval is recommended \u2014 half the standard 12-month interval of smaller couplings. The shorter interval reflects the higher contact pressures at the sliding interfaces and the more demanding ambient typical of these installations. In light-duty service the 12-month interval remains appropriate.<\/p>\n<\/details>\n

\nCan the SL210 be balanced for higher-speed operation?<\/summary>\n

Catalogue rating is 250 r\/min. For applications operating up to 400 r\/min, ISO 1940 G2.5 precision balance is documented and available \u2014 please specify at order entry. Above 400 r\/min the SL210 is not the appropriate selection; consult engineering for an alternative within the EP6 precision-coupling family.<\/p>\n<\/details>\n

\nAre taper-bushed mounting variants supported?<\/summary>\n

Yes. For mining, slurry-pump, and other high-shock applications, taper-bushed mounting via standard RINGFEDER 7012, KTR-Clampex, or equivalent locking-assembly families is the documented engineering best practice. The taper-bush eliminates the keyway-shear failure mode entirely. Lead time for taper-bushed variant is typically 2\u20133 weeks beyond catalogue.<\/p>\n<\/details>\n

\nWhat is the recommended motor-starter coordination for the SL210?<\/summary>\n

For installations with the SL210 in the drive train, we recommend VFD soft-start or fluid-coupling-isolated start, set to limit inrush torque to no more than 2\u00d7 rated SL210 torque (10 000 N\u00b7m peak). Direct-on-line starting of large motors directly through the SL210 is technically permissible but reduces slider service life by 30\u201340 % through accumulated shock-load damage.<\/p>\n<\/details>\n

Quote SL210 for Heavy Industrial Drives<\/h3>\n

For mining, slurry-pump, hydropower, and heavy process-mixer installations in the 90\u2013130 kW power class, the SL210 has been Ever-power’s reliability standard for decades. Browse the complete SL series catalogue<\/a>, learn about Ever-power’s industrial supply commitments<\/a>, or move directly to enquiry below.<\/p>\n

\n Quote SL210 \u2192<\/a>\n<\/p>\n