{"id":781,"date":"2026-06-23T09:47:07","date_gmt":"2026-06-23T09:47:07","guid":{"rendered":"https:\/\/oldhamcoupling.net\/product\/sl400-industrial-oldham-coupling\/"},"modified":"2026-06-24T08:47:43","modified_gmt":"2026-06-24T08:47:43","slug":"sl400-industrial-oldham-coupling","status":"publish","type":"product","link":"https:\/\/oldhamcoupling.net\/ru\/product\/sl400-industrial-oldham-coupling\/","title":{"rendered":"SL400 Industrial Oldham Coupling"},"content":{"rendered":"
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SL400 Heavy-Industrial Cross-Slider Oldham Coupling \u2014 400 mm Cast-Iron Hub for Ship-Propulsion Auxiliary and Major Hoist Drives<\/h2>\n

The SL400 industrial Oldham coupling<\/strong> sits in the second-from-top position of the SL family \u2014 a major capital-equipment asset designed for the ship-propulsion auxiliary, major mine-hoist main, and major hydropower main-auxiliary duty class. With 38 700 N\u00b7m rated torque, 400 mm hub OD, single 170 mm shaft, and \u2014 for the first time in the SL family \u2014 a permissible speed reduced to 80 r\/min, the SL400 transmits approximately 325 kW of continuous mechanical power in the ultra-slow-speed, very-high-torque envelope. At 305 kg total mass, the SL400 is a strategic asset for the host equipment: specified through formal multi-discipline engineering review, integrated into the equipment’s design-life and safety-case documentation, and tracked individually on the operator’s asset-management system throughout its installed life.<\/p>\n

The reduction in permissible speed from 100 r\/min (SL340\/SL360) to 80 r\/min reflects a continuing engineering trend across the SL family’s upper tier. Hub outside-diameter has now reached 400 mm; at 100 r\/min, outer-rim sliding velocity would reach 2.1 m\/s \u2014 exceeding the optimal envelope for grease-lubricated metallic interfaces in continuous-production duty. The 80 r\/min limit reduces this to 1.7 m\/s, maintaining lubrication-film integrity over decade-class service intervals. Engineers specifying the SL400 should be aware that this speed limit is not a conservative catalogue choice \u2014 it is a real engineering parameter that affects slider service life and lubrication-maintenance scheduling.<\/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>\nSL400<\/td>\n<\/tr>\n
Nominal Torque (Tn)<\/td>\n38 700 N\u00b7m<\/td>\n<\/tr>\n
Permissible Speed (n)<\/td>\n80 r\/min<\/td>\n<\/tr>\n
Bore (d)<\/td>\n170 mm<\/td>\n<\/tr>\n
Outside Diameter (D)<\/td>\n400 mm<\/td>\n<\/tr>\n
Hub Bore Diameter (D\u2081)<\/td>\n260 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n300 mm<\/td>\n<\/tr>\n
Slider Plate Thickness (H)<\/td>\n48 mm<\/td>\n<\/tr>\n
Slider Clearance (S)<\/td>\n1.0 mm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n26.1 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Mass<\/td>\n305 kg<\/td>\n<\/tr>\n
Radial Misalignment (\u0394y)<\/td>\n6.6 mm<\/td>\n<\/tr>\n
Angular Misalignment (\u0394\u03b1)<\/td>\n0.5\u00b0<\/td>\n<\/tr>\n
Axial Misalignment (\u0394x)<\/td>\n6.4 mm<\/td>\n<\/tr>\n
Shaft Engagement<\/td>\nHeavy taper-bushed<\/td>\n<\/tr>\n
Lubrication<\/td>\nGrease (re-pack 4-monthly)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"SL400<\/p>\n

Materials<\/h3>\n
\n
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QT600-3 \/ ZG270-500 Heavy-Hub Options<\/h4>\n

At SL400 size and torque rating, QT600-3 ductile-iron is the catalogue standard hub specification, with ZG270-500 cast-steel as the engineering-preferred upgrade for major ship-propulsion auxiliary, primary mine-hoist main, and routine 2.5\u00d7 rated-torque shock-load deployments. Each hub at QT600 specification masses approximately 140 kg. For exceptional safety-critical applications, certified-melt cast-steel variants with elevated material-testing protocols are documented and available through specialised engineering review.<\/p>\n<\/p><\/div>\n

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48 mm Heavy Hardened Slider<\/h4>\n

48 mm thick induction-hardened 45-steel cross-slider catalogue standard; 40Cr alloyed-steel slider with HRC 55 surface hardness for reversal-duty and hoist-class deployments. Slider masses approximately 38 kg with pre-machined lifting-eyelet provisions (M20 threaded). For severe abrasive environments, hardfaced tungsten-carbide overlay variant is offered. For very large vessel propulsion-auxiliary deployments, a fully heat-treated 42CrMo4 alloy slider option is documented.<\/p>\n<\/p><\/div>\n

\n

Heavy Industrial Taper-Bush<\/h4>\n

Mounting via heavy-duty locking-assembly families designed for the 170 mm bore \/ 260 mm hub-bore-diameter envelope: Trantorque GT-Heavy 200 series, RINGFEDER 7012 large-bore, KTR-Clampex 200\/250 series. Engineering-supplied installation packets include torque-sequence diagrams, locking-bolt-tightening cycles, and post-installation retention verification protocols. Type-certified locking-bolt hardware standard.<\/p>\n<\/p><\/div>\n<\/div>\n

The Engineering Profile of Ultra-Heavy Slow-Speed Duty<\/h3>\n

The SL400’s engineering profile sits at the intersection of three demanding application classes: ship-propulsion auxiliary trains (continuous-duty marine environment, 25\u201330 year design life, safety-critical role in vessel-propulsion redundancy), major mine-hoist main drives (regulated-industry safety-case integration, zero-backlash transmission requirement, shock-load events from hoist reversal), and major hydropower main-auxiliary drives (extreme service-life expectation of 30\u201350 years, infrequent maintenance access, regulatory compliance for grid-connected critical infrastructure). The common thread across these applications is that the coupling is a strategic asset whose failure has consequences extending far beyond the equipment-local maintenance economics \u2014 into vessel availability, mine safety regulation, or grid-reliability metrics.<\/p>\n

The SL400’s response to this engineering profile is built into the architecture and the supplier-relationship model that surrounds it. The architecture delivers the failure-mode predictability (gradual wear of inspectable slider, no fatigue-energy-storage mechanism, no elastomer to age-out, no fluid charge to lose) that any rigorous safety-case analysis demands. The supplier-relationship model delivers the engineering-support depth (FMEA documentation, type-approval support, on-site commissioning supervision, 30-year part-availability commitment) that major capital-equipment specifications require. The combined offering has kept the SL400 on equipment specifications across multiple equipment generations in the ship-propulsion-auxiliary, mining-hoist, and major-hydropower markets \u2014 and it remains the senior-engineered choice in these segments today.<\/p>\n

For broader engineering discussion of ultra-heavy slow-speed coupling architectures, see Ever-power’s senior engineering portal<\/a>.<\/p>\n

\"SL400<\/p>\n

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

<\/span> Ship-Propulsion Auxiliary Lines<\/h4>\n

Major auxiliary drive lines on large commercial vessels \u2014 main-shaft brake actuators, propeller-pitch-change auxiliary, main-thruster auxiliary. Marine type-approval available; QT600 or cast-steel hubs resist saltwater ambient.<\/p>\n<\/p><\/div>\n

\n

\u2692\ufe0f<\/span> Primary Mine-Hoist Main Drives<\/h4>\n

Main-drive coupling on primary mine-hoist installations in deep-shaft underground mining operations. Zero-backlash transmission supports safety-interlock integration; gradual failure mode supports SIL 1\/2 safety-case application.<\/p>\n<\/p><\/div>\n

\n

<\/span> Major Hydropower Main-Aux<\/h4>\n

Main-auxiliary drive coupling on large hydropower-station governor-aux, intake-cleaning, and main-tailgate drives. 30+ year design-life alignment with hydropower-infrastructure asset profile.<\/p>\n<\/p><\/div>\n

\n

<\/span> Major Cement-Kiln Main<\/h4>\n

Main-drive coupling on major-capacity cement-kiln rotating-section drives at the top of plant production-rating envelope. Substantial misalignment tolerance absorbs full kiln-shell thermal expansion.<\/p>\n<\/p><\/div>\n

\n

\u26cf\ufe0f<\/span> Major Minerals-Mill Main<\/h4>\n

Major-mill main-drive couplings on the largest tier of primary minerals-processing equipment. SAG-mill and autogenous-mill primary drives at the upper end of installed-base capacity.<\/p>\n<\/p><\/div>\n

\n

\u2693<\/span> Major Marine Crane Slewing<\/h4>\n

Main slewing drives on heavy-lift shipyard cranes, floating heavy-lift vessels, and major offshore-supply-vessel crane installations. Substantial shock-load tolerance addresses crane-indexing events under wave-motion ambient.<\/p>\n<\/p><\/div>\n<\/div>\n

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

Quality & Compliance<\/h4>\n

SL400 production runs under ISO 9001:2015<\/strong> with full melt-traceability per cast-iron, ductile-iron, and cast-steel heat. Documentation pack covers RoHS<\/strong>, REACH<\/strong>, CE<\/strong> conformity, comprehensive FMEA documentation, 30-year fatigue-endurance analysis, and detailed shock-load-profile compatibility statements. Marine type-approval (Lloyd’s Register, DNV-GL, ABS, BV) supported via engineering review. Mining safety-case integration documentation tailored to regulatory regime (MSHA, MHSA, regional equivalents).<\/p>\n

Customisation<\/h4>\n

Catalogue bore 170 mm; custom-bore variants from 160 mm to 180 mm produced under engineering review with 6-week lead time. QT600-3 ductile-iron standard, ZG270-500 cast-steel engineering-preferred. 42CrMo4 alloy-slider variant for major vessel propulsion-auxiliary applications. Heavy taper-bushed mounting via certified-bolt locking-assembly families. Hardfaced tungsten-carbide slider variant for severe abrasive environments.<\/p>\n

Strategic-Asset Aftermarket<\/h4>\n

SL400 slider plates and alloy variants stocked for 2-business-day shipment. Mass per coupling 305 kg; sea-freight in welded-steel transport cradle with secondary shock-absorbing internal packaging. English-speaking engineering desk responds within 24 hours<\/strong>. 30-year part-availability commitment for slider plates and consumables. On-site engineering supervision available for major installations under separate commercial terms.<\/p>\n<\/div>\n

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

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

Guatemala \u2014 Geothermal Power Generation<\/h4>\n

Used in:<\/em> Main-auxiliary drive coupling on a 25 MW geothermal-power station turbine-auxiliary train.<\/p>\n

Feedback:<\/em> “Specified the SL400 with ZG270-500 cast-steel hubs after detailed engineering review against gear-coupling and large flexible-disc alternatives. Eight years of three-shift continuous duty without unplanned events. The 30-year part-availability commitment was a non-negotiable requirement in our utility-scale generation specification. Excellent engineering relationship throughout the major-equipment lifecycle.”<\/p>\n<\/p><\/div>\n

\n

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

El Salvador \u2014 Underground Gold-Mining Operation<\/h4>\n

Used in:<\/em> Primary mine-hoist main-drive coupling on a deep-shaft underground gold-mining installation.<\/p>\n

Feedback:<\/em> “Hoist-main duty requires impeccable safety-case documentation and regulatory regime compliance. The SL400 with QT600 hubs, 40Cr alloy slider, and certified-bolt locking-assembly mounting has met every regulatory and reliability-engineering review at this site over 6 years of continuous service. FMEA documentation was material in our safety-management-system qualification \u2014 saved approximately 4 months of compliance-review work versus alternative specifications.”<\/p>\n<\/p><\/div>\n

\n

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

Trinidad and Tobago \u2014 LNG-Production Compressor Train<\/h4>\n

Used in:<\/em> Main-auxiliary drive coupling on an LNG production-train booster-compressor auxiliary.<\/p>\n

Feedback:<\/em> “Continuous-process LNG duty with extreme reliability requirements and stringent safety-case integration. The SL400 with ZG270-500 cast-steel hubs and synthetic-grease specification has handled 5 years of continuous duty without unplanned events. Knock one star only because the initial type-approval lead time for our specific class-society requirements (BV) was 16 weeks rather than the standard 12 \u2014 eventually addressed through dedicated engineering attention. Otherwise outstanding strategic-asset specification.”<\/p>\n<\/p><\/div>\n<\/div>\n

Frequently Asked Questions<\/h3>\n
\nWhy is permissible speed 80 r\/min rather than 100 r\/min?<\/summary>\n

At 400 mm OD, operation at 100 r\/min would produce outer-rim sliding velocity of 2.1 m\/s \u2014 exceeding the optimal envelope for grease-lubricated metallic interfaces in continuous-production duty. The 80 r\/min limit reduces this to 1.7 m\/s, maintaining lubrication-film integrity over decade-class service intervals. For applications requiring sub-rated speeds (50\u201380 r\/min), the SL400 operates at full performance throughout its envelope.<\/p>\n<\/details>\n

\nWhat marine type-approvals are supported?<\/summary>\n

Lloyd’s Register (LR), DNV-GL (now DNV), American Bureau of Shipping (ABS), Bureau Veritas (BV), China Classification Society (CCS), Russian Maritime Register (RMRS), and other major class societies. Type-approval engineering documentation includes material certificates, dimensional inspection records, comprehensive FMEA analysis, shock-load performance verification, fatigue-endurance analysis, and class-society-specific compliance statements. Typical lead time is 12\u201316 weeks beyond standard delivery; cost depends on class-society fee schedules.<\/p>\n<\/details>\n

\nHow is the SL400 installed at 305 kg?<\/summary>\n

Installation requires substantial hoist support \u2014 typically 2-ton or larger overhead-crane capacity. Each hub at QT600 masses approximately 140 kg; slider plate 38 kg; assembled coupling 305 kg total. Pre-machined lifting-eyelet provisions (M20 threaded) on both hub-faces are standard. Installation procedure requires precision shaft-alignment to within 1 mm parallel before locking-assembly engagement, then sequenced bolt-tightening per supplied torque-sequence diagram. Typical installation time is 3\u20134 hours for a competent crew with appropriate hoist support.<\/p>\n<\/details>\n

\nIs on-site engineering supervision available?<\/summary>\n

Yes. For major capital-equipment installations of the SL400, Ever-power offers on-site engineering supervision during installation and commissioning, with the engineer remaining for the duration of host-equipment commissioning and signing-off the coupling-installation portion of the equipment hand-over documentation. Service is offered under separate commercial terms; cost is typically modest relative to the host-equipment value and avoids the risk of installation-attributable warranty disputes.<\/p>\n<\/details>\n

\nWhat is the documented service life under typical major-equipment duty?<\/summary>\n

Under typical major-equipment continuous-production duty (60\u201370 % rated load, 60 r\/min average operating speed, parallel offset below 2 mm typical), the QT600 ductile-iron hub section is expected to remain in service for the full 30+ year design life of the host equipment, with slider replacement at 10\u201312 year intervals during major plant or vessel overhauls. With ZG270 cast-steel hub upgrade, the design margin extends accordingly. Cast-iron\/cast-steel hubs have field-service track record of 30\u201340 year retention across multiple slider-replacement cycles.<\/p>\n<\/details>\n

Quote SL400 for Strategic-Asset Drives<\/h3>\n

For ship-propulsion auxiliary, primary mine-hoist main, major hydropower main-auxiliary, and major cement-kiln main applications in the 325 kW ultra-slow-speed power class, the SL400 is Ever-power’s senior strategic-asset specification. Browse the wider SL series catalogue<\/a>, read about Ever-power’s strategic-asset supply capability<\/a>, or move directly to a B2B enquiry below.<\/p>\n

\n Quote SL400 Now \u2192<\/a>\n<\/p>\n