{"id":778,"date":"2026-06-23T09:47:05","date_gmt":"2026-06-23T09:47:05","guid":{"rendered":"https:\/\/oldhamcoupling.net\/product\/sl320-industrial-oldham-coupling\/"},"modified":"2026-06-24T08:47:43","modified_gmt":"2026-06-24T08:47:43","slug":"sl320-industrial-oldham-coupling","status":"publish","type":"product","link":"https:\/\/oldhamcoupling.net\/pl\/produkt\/sl320-industrial-oldham-coupling\/","title":{"rendered":"SL320 Industrial Oldham Coupling"},"content":{"rendered":"
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SL320 Heavy-Industrial Cross-Slider Oldham Coupling \u2014 320 mm Cast-Iron Hub for Minerals-Processing and Port-Terminal Drives<\/h2>\n

The SL320 industrial Oldham coupling<\/strong> sits in the heart of the slow-speed, high-torque envelope. With 16 000 N\u00b7m rated torque, 320 mm hub OD, 130\u2013140 mm bore range, and 100 r\/min permissible speed, the SL320 transmits approximately 170\u2013200 kW of continuous mechanical power. This is the duty profile of heavy minerals-processing mill drives, large cement-kiln auxiliary inputs, primary port-terminal stacker\/reclaimer main-auxiliary drives, and the larger end of metallurgical-process slow-speed mixers. At this size class, the coupling specification is invariably a senior-engineering decision, supported by reliability analysis, maintenance-economics evaluation, and full lifecycle-cost modelling over a 20\u201330 year horizon.<\/p>\n

The SL320’s place in the catalogue reflects an engineering reality of large industrial drives: between the 13 000 N\u00b7m SL300 and the 20 000 N\u00b7m SL340, there is a substantial population of process equipment that needs exactly the 16 000 N\u00b7m envelope \u2014 neither the over-specification cost of a larger coupling nor the inadequate margin of a smaller one. For minerals-processing operators specifically, the SL320 sits at the size sweet-spot for secondary ball-mill auxiliaries, large flotation-cell agitator drives, and the heavier-end thickener-rake mechanisms that dominate the back-end of mineral concentration plants. These applications share a common engineering challenge: very steady torque at low speed, with substantial frame-deflection misalignment under load, and 24\/7 production-mode operation across decade-class service intervals.<\/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>\nSL320<\/td>\n<\/tr>\n
Nominal Torque (Tn)<\/td>\n16 000 N\u00b7m<\/td>\n<\/tr>\n
Permissible Speed (n)<\/td>\n100 r\/min<\/td>\n<\/tr>\n
Bore Range (d)<\/td>\n130 \u2013 140 mm<\/td>\n<\/tr>\n
Outside Diameter (D)<\/td>\n320 mm<\/td>\n<\/tr>\n
Hub Bore Diameter (D\u2081)<\/td>\n190 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n220 mm<\/td>\n<\/tr>\n
Slider Plate Thickness (H)<\/td>\n43 mm<\/td>\n<\/tr>\n
Slider Clearance (S)<\/td>\n1.0 mm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n5.7 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Mass<\/td>\n129 kg<\/td>\n<\/tr>\n
Radial Misalignment (\u0394y)<\/td>\n5.2 mm<\/td>\n<\/tr>\n
Angular Misalignment (\u0394\u03b1)<\/td>\n0.5\u00b0<\/td>\n<\/tr>\n
Axial Misalignment (\u0394x)<\/td>\n4.6 mm<\/td>\n<\/tr>\n
Shaft Engagement<\/td>\nTaper-bushed standard<\/td>\n<\/tr>\n
Lubrication<\/td>\nGrease (re-pack 6-monthly)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"SL320<\/p>\n

Materials<\/h3>\n
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QT500-7 Ductile-Iron Hubs (Standard)<\/h4>\n

Hubs are QT500-7 nodular cast iron with stress-relief annealing. Each hub masses approximately 60 kg, with section thickness engineered to a 3\u00d7 safety factor against the rated 16 000 N\u00b7m peak. For ultra-aggressive minerals-processing shock-load profiles, QT600-3 cast-steel hub variant is documented and available under engineering review with a 6-week extended lead time.<\/p>\n<\/p><\/div>\n

\n

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

43 mm thick induction-hardened 45-steel cross-slider standard; 40Cr alloyed-steel slider variant for reversal-duty and aggressive abrasive-ambient minerals-processing deployments. Slider masses approximately 16 kg; pre-machined lifting eyelets supplied as standard for hoist-supported field service. Bronze CuSn10 slider available for electrical-isolation applications.<\/p>\n<\/p><\/div>\n

\n

Taper-Bushed Mounting (Standard)<\/h4>\n

At the SL320 size, taper-bushed mounting via standard locking-assembly families (RINGFEDER 7012, KTR-Clampex, Trantorque) is the engineering standard rather than a custom option. The H7-reamed keyway variant remains available for cost-sensitive light-duty service, but is not the engineering recommendation for minerals-processing, cement-kiln, or port-terminal deployments.<\/p>\n<\/p><\/div>\n<\/div>\n

The Engineering Profile of Minerals Processing<\/h3>\n

Minerals-processing equipment occupies a distinctive engineering niche. Production is continuous and asset-utilisation-driven \u2014 typical operational targets are 92\u201396 % available hours per year, leaving only 350\u2013700 hours per year for all planned maintenance combined. The drive train sees steady-state torque interrupted by routine 1.5\u20132\u00d7 rated-torque shock events from inhomogeneous ore feed, oversize-rock impacts, and the start-loaded-conveyor profile of granular-material handling. Ambient conditions are abrasive (rock dust), corrosive (process liquors), and often thermally extreme (open-pit operations spanning seasonal temperature ranges of -30 \u00b0C to +50 \u00b0C).<\/p>\n

The SL320’s design addresses each of these challenges through specific architectural choices. QT500 ductile-iron hubs deliver shock-load endurance through superior fracture toughness. Sealed coupling guard to IP54 isolates the slider lubrication from abrasive ambient. Synthetic polyalphaolefin grease specification (catalogue option) maintains viscosity across the operating-temperature window. Taper-bushed mounting eliminates the keyway-shear failure mode under realistic shock-load profile. And the field-replaceable slider plate allows scheduled replacement during major plant turnarounds \u2014 typically 4-year cycles for ball-mill, 5-year cycles for thickener-rake mechanisms \u2014 eliminating coupling replacement from the operational maintenance touch-point list.<\/p>\n

For further engineering background on minerals-processing coupling selection, see Ever-power’s specialty industries portal<\/a>.<\/p>\n

\"SL320<\/p>\n

Industry Applications<\/h3>\n
\n
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\u26f0\ufe0f<\/span> Secondary Ball-Mill Auxiliary<\/h4>\n

Auxiliary input couplings on secondary ball-mill installations in minerals-processing plants. Slow-speed envelope aligns with mill operating profile; misalignment tolerance handles substantial mill-shell deflection.<\/p>\n<\/p><\/div>\n

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<\/span> Cement-Kiln Auxiliary Inputs<\/h4>\n

Drive coupling on cement-kiln auxiliary rotating-section drives. Misalignment tolerance absorbs kiln-shell thermal expansion across the burner-zone temperature gradient.<\/p>\n<\/p><\/div>\n

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<\/span> Port-Terminal Main Auxiliary<\/h4>\n

Stacker-reclaimer luffing and slewing drives on bulk-cargo port-terminal infrastructure. Coastal-salt ambient compatibility through QT500 hubs and synthetic-grease specification.<\/p>\n<\/p><\/div>\n

\n

<\/span> Large Flotation-Cell Agitators<\/h4>\n

Drive coupling on large minerals-flotation cell agitator drives. Slow-speed steady-state operation; zero-backlash transmission supports flotation-process consistency requirements.<\/p>\n<\/p><\/div>\n

\n

\u2699\ufe0f<\/span> Heavy Thickener-Rake Drives<\/h4>\n

Drive coupling on large thickener-rake mechanisms in minerals concentration and metallurgical-leach plant operations. Long-cycle reliability across the 15\u201320 year design life of typical thickener installations.<\/p>\n<\/p><\/div>\n

\n

<\/span> Large Water-Industry Pumps<\/h4>\n

Drive coupling on large municipal water-treatment, irrigation, and flood-control pump installations. Long-cycle reliability across the 30+ year design life of water-infrastructure assets.<\/p>\n<\/p><\/div>\n<\/div>\n

Why Choose Ever-power<\/h3>\n
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Quality & Compliance<\/h4>\n

SL320 production runs under ISO 9001:2015<\/strong> with full melt-traceability per cast-iron heat. Documentation pack covers RoHS<\/strong>, REACH<\/strong>, CE<\/strong> conformity, plus FMEA documentation. For minerals-processing customers, supplementary documentation covering shock-load profile compatibility and SAG\/Ball-mill-specific duty-cycle analysis is available. For port-terminal customers, NACE MR0175 sour-service compatibility and EN ISO 12944 corrosivity-class C5 documentation can be supplied.<\/p>\n

Customisation<\/h4>\n

Catalogue bore range 130\u2013140 mm; oversized variants up to 145 mm produced under engineering review. Imperial-bore variants (5-1\/8″, 5-1\/4″, 5-3\/8″, 5-1\/2″) supported for North American export markets. QT500-7 ductile-iron hub is the engineering recommended standard; QT600-3 cast-steel variant for ultra-aggressive shock-load applications. Taper-bushed mounting via standard locking-assembly families is the documented standard.<\/p>\n

Critical-Asset Aftermarket<\/h4>\n

SL320 slider plates and 40Cr alloy variants stocked for 2-business-day shipment. Mass per coupling 129 kg; sea-freight in heavy-duty reinforced crating with secondary shock-absorbing packaging. English-speaking engineering desk responds within 24 hours<\/strong>. Pre-negotiated emergency-replacement protocols guarantee 5-working-day delivery from confirmed PO.<\/p>\n<\/div>\n

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

Customer Reviews & Case Studies<\/h3>\n
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\u2605\u2605\u2605\u2605\u2605<\/p>\n

Oman \u2014 Copper-Concentrator Operation<\/h4>\n

Used in:<\/em> Secondary-grinding ball-mill auxiliary input drive on a 35 kt\/d copper-concentrator plant.<\/p>\n

Feedback:<\/em> “Specified the SL320 with QT500 hubs, taper-bushed mounting, and 40Cr alloy slider after a comprehensive engineering review against gear-coupling and disc-pack alternatives. Six years of three-shift duty with two slider replacements during major plant overhauls. Asset-utilisation impact has been excellent \u2014 zero coupling-attributable unplanned events. Specification will be applied across our next two concentrator plant expansions.”<\/p>\n<\/p><\/div>\n

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

Bolivia \u2014 Tin-Mine Concentrator<\/h4>\n

Used in:<\/em> Flotation-cell agitator-drive coupling on a tin-mineral concentrator operation.<\/p>\n

Feedback:<\/em> “High-altitude operation (4 200 m elevation) introduces atypical thermal and lubrication challenges. The SL320 with synthetic-grease specification has handled this without issue across 5 years of continuous duty. Engineering response to our altitude-specific commissioning questions was excellent \u2014 within 24 hours we had clear guidance on grease-vapour-pressure compatibility and bearing-load adjustments. Best supplier engineering interaction we have had on this site.”<\/p>\n<\/p><\/div>\n

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

Paraguay \u2014 Soy-Crushing Plant Operator<\/h4>\n

Used in:<\/em> Soybean-conditioner main-drive coupling on a 2 500 t\/d soy-crushing facility.<\/p>\n

Feedback:<\/em> “Continuous-process duty with significant elevated-temperature ambient at the conditioner. The SL320 has now passed 4 years of continuous duty without unplanned events. Knock one star only because emergency-replacement protocol delivery time to our inland location took 9 working days during one urgent event \u2014 the protocol commits to 5 working days but in our remote case the air-freight logistics extended this slightly. Otherwise excellent.”<\/p>\n<\/p><\/div>\n<\/div>\n

Frequently Asked Questions<\/h3>\n
\nHow does the SL320 perform in high-altitude installations?<\/summary>\n

Reduced atmospheric pressure at altitude affects grease vapour-pressure profiles and bearing-load distribution. For installations above 3 000 m elevation, specify a synthetic polyalphaolefin grease with documented low-vapour-pressure profile, and please consult Ever-power engineering for an altitude-compatibility review. The cast-iron and steel material specifications themselves operate without de-rating across the full altitude range.<\/p>\n<\/details>\n

\nWhat is the documented shock-load endurance for minerals-processing?<\/summary>\n

With QT500 ductile-iron hubs, the SL320 carries a documented 3\u00d7 rated-torque shock-load capacity (48 000 N\u00b7m peak instantaneous) without permanent damage, and a routine 2\u00d7 rated-torque event tolerance (32 000 N\u00b7m) without measurable accumulated damage over a 20-year service life. With QT600-3 cast-steel hub upgrade, these margins improve by approximately 25 %.<\/p>\n<\/details>\n

\nIs the SL320 supported under 24\/7 production-mode service?<\/summary>\n

Yes \u2014 24\/7 continuous-production operation is the normal duty profile for this size class. The semi-annual grease-repack interval is compatible with typical asset-utilisation targets of 92\u201396 % yearly availability, and slider-replacement intervals (8\u201310 years under typical mill duty) align naturally with major plant turnaround cycles. Production-mode duty does not de-rate any catalogue specification.<\/p>\n<\/details>\n

\nWhat lifecycle-cost framework should I use to evaluate the SL320?<\/summary>\n

For a 20-year operating-cost evaluation, include: (1) coupling acquisition cost; (2) installation cost (typically 8\u201312 hours of skilled labour); (3) annual semi-annual grease-repack labour (1 hour each, twice yearly); (4) every 8\u201310 year slider replacement at planned shutdown (90 minutes of skilled labour, plus slider part cost); (5) annual inspection labour (15 minutes). Total 20-year cost typically ranks the SL320 below competing flexible-coupling architectures by a clear margin.<\/p>\n<\/details>\n

\nIs supplier engineering support available during commissioning?<\/summary>\n

Yes. Ever-power engineering responds within 24 hours to commissioning questions in English, with extended support windows available for high-volume OEM partners. For major capital-equipment installations, remote video-conference support during commissioning is offered without additional charge for critical-asset customers. On-site supervision can be arranged for major installations under separate commercial terms.<\/p>\n<\/details>\n

Quote SL320 for Heavy Minerals-Processing Drives<\/h3>\n

For secondary ball-mill auxiliary, cement-kiln auxiliary, large port-terminal, flotation-cell, and heavy thickener-rake applications, the SL320 is Ever-power’s senior-engineered specification for minerals-processing slow-speed high-torque duty. Explore the wider SL series catalogue<\/a>, learn about Ever-power’s minerals-processing supply capability<\/a>, or move directly to a B2B enquiry below.<\/p>\n

\n Quote SL320 Now \u2192<\/a>\n<\/p>\n