{"id":760,"date":"2026-06-23T09:46:50","date_gmt":"2026-06-23T09:46:50","guid":{"rendered":"https:\/\/oldhamcoupling.net\/product\/ep6-70-set-screw-oldham-coupling\/"},"modified":"2026-06-24T08:47:40","modified_gmt":"2026-06-24T08:47:40","slug":"ep6-70-set-screw-oldham-coupling","status":"publish","type":"product","link":"https:\/\/oldhamcoupling.net\/ko\/product\/ep6-70-set-screw-oldham-coupling\/","title":{"rendered":"EP6-70 Set Screw Oldham Coupling"},"content":{"rendered":"
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EP6-70 Heavy Industrial Set Screw Oldham Coupling \u2014 70 mm Three-Piece Slider for High-Power Drive Trains<\/h2>\n

The EP6-70 Oldham coupling<\/strong> is the largest set-screw variant in the EP6 family \u2014 and a watershed point in the catalogue. With a 70 mm outside diameter, 59 mm overall length, six catalogue bores spanning 24 mm through 35 mm, and a torque envelope of 80 N\u00b7m rated \/ 160 N\u00b7m peak at 2 300 rpm, the EP6-70 transmits up to 19 kW of continuous mechanical power. At this scale the coupling no longer serves benchtop instruments or light-automation gantries; it becomes the flexible connector between substantial gearmotors and the kind of heavy industrial driven loads where unplanned downtime carries hard-dollar consequences.<\/p>\n

Selection rationale at this size focuses on three engineering priorities: torque density (more torque per kilogram of reflected inertia than a steel-disc-pack coupling of equivalent rating), misalignment forgiveness (the EP6-70’s 3.8 mm allowance compares favourably to under-1 mm for typical metallic-disc options), and serviceability (slider replacement remains a sub-shift operation regardless of how the coupling has been installed). The combination is what convinces fleet engineers to specify the EP6-70 across compressor packages, conveyor head-pulley drives, large mixer trains, and crane auxiliary lines.<\/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
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nEP6-70<\/td>\n<\/tr>\n
Outside Diameter (\u03a6D)<\/td>\n70 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n59 mm<\/td>\n<\/tr>\n
Bore Range (d1 \/ d2)<\/td>\n24, 25, 28, 30, 32, 35 mm<\/td>\n<\/tr>\n
Rated Torque<\/td>\n80 N\u00b7m<\/td>\n<\/tr>\n
Maximum Torque<\/td>\n160 N\u00b7m<\/td>\n<\/tr>\n
Maximum Rotational Speed<\/td>\n2 300 rpm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n1.7 \u00d7 10\u207b\u2074 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Static Torsional Stiffness<\/td>\n1 600 N\u00b7m\/rad<\/td>\n<\/tr>\n
Parallel Misalignment<\/td>\n3.8 mm<\/td>\n<\/tr>\n
Angular Misalignment<\/td>\n3.0\u00b0<\/td>\n<\/tr>\n
Set-screw Thread<\/td>\nM10<\/td>\n<\/tr>\n
Wrench Tightening Torque<\/td>\n32 N\u00b7m<\/td>\n<\/tr>\n
Mass (max bore)<\/td>\n456 g<\/td>\n<\/tr>\n
Backlash<\/td>\nZero<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"EP6-70<\/p>\n

Materials<\/h3>\n
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Heavy-Section Aluminum Hubs<\/h4>\n

Hubs are machined from A6061-T651 stress-relieved aluminum bar and hard-anodised with a 60 \u00b5m wear-resistant coating. The heavier-section design distributes the M10 set-screw clamping force over a larger thread engagement, eliminating the bore-distortion risk that smaller hubs can exhibit when set screws are over-torqued.<\/p>\n<\/p><\/div>\n

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Industrial-Grade Slider<\/h4>\n

At the EP6-70’s duty class, the standard slider is 25 % glass-fibre-reinforced POM-H \u2014 a step up from the 15 % GF-POM used in smaller EP6 sizes. The higher filler loading raises continuous-service torque capacity at elevated temperature and improves creep resistance under sustained load. PEEK is available for >110 \u00b0C continuous service; stainless-steel hub variants are released for marine and food-handling deployments.<\/p>\n<\/p><\/div>\n

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Heavy M10 Set-Screw Pairs<\/h4>\n

Two M10 SUS304 cup-point set screws per hub, separated by 90\u00b0. Specified at 32 N\u00b7m wrench torque. The cup-point geometry produces a measurable depression in the shaft surface at first tightening \u2014 for high-cycle reversible duty, dimpled-key flats are recommended to provide a positive shaft engagement that does not migrate over time.<\/p>\n<\/p><\/div>\n<\/div>\n

Selecting the EP6-70 at the High-Power Limit<\/h3>\n

At 80 N\u00b7m \/ 2 300 rpm \u2014 roughly 19 kW continuous \u2014 the EP6-70 sits at a selection junction where alternatives such as steel disc-pack couplings, grid couplings, and double-flex shaft couplings become realistic competitors. The reasons engineers continue to choose the EP6-70 in this competitive space come down to four practical factors. First, installation: there is no disc-pack timing, no machined ground key, no precision shimming \u2014 just two shafts, two hubs, four set screws, and a centre disc. Total install time for a trained technician is under 15 minutes.<\/p>\n

Second, inertia: at 1.7 \u00d7 10\u207b\u2074 kg\u00b7m\u00b2, the EP6-70’s reflected inertia at the motor is roughly half that of a comparable steel-disc-pack coupling, reducing the work that the host servo or VFD-controlled motor has to do during acceleration and braking events. Third, misalignment tolerance: the 3.8 mm parallel-offset envelope removes the need for precision laser-aligned shaft mounting, which can save days during commissioning of a new production line. Fourth, replaceability: a worn slider can be exchanged in the field with hand tools and a 10-minute downtime window \u2014 a service interval that simply cannot be matched by any flexible-disc or grid coupling.<\/p>\n

\"EP6-70<\/p>\n

Industry Applications<\/h3>\n
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<\/span> Industrial Compressor Packages<\/h4>\n

Motor-to-compressor connection on screw and scroll air compressors up to 22 kW. The slider’s misalignment tolerance absorbs the substantial thermal growth between motor and compressor heads during start-up.<\/p>\n<\/p><\/div>\n

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

Drive-end couplings on heavy belt and apron conveyors. Slider absorbs the shock load when material loading is uneven or when emergency-stop arrest is triggered.<\/p>\n<\/p><\/div>\n

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\ufe0f<\/span> Crane Auxiliary Drives<\/h4>\n

Trolley traverse, hoist auxiliary, and outrigger drives on overhead bridge and gantry cranes. The EP6-70 is a maintenance-engineer favourite for its serviceable wear part.<\/p>\n<\/p><\/div>\n

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<\/span> Heavy Mixer Reduction Output<\/h4>\n

Coupling between worm-gear or planetary-reduction output stage and large blender, mixer, or kneader impeller shaft. Forgives thermal growth that occurs between cold-process and operating temperature.<\/p>\n<\/p><\/div>\n

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<\/span> Wastewater Treatment Pumps<\/h4>\n

Large centrifugal and lobe-pump drives in municipal and industrial wastewater plants. Polymer slider provides electrical isolation between motor frame and wet-end pump body.<\/p>\n<\/p><\/div>\n

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\u2692\ufe0f<\/span> Steel-Mill Auxiliary Trains<\/h4>\n

Roll-table, finishing-mill, and coiler auxiliary drive lines. High-temperature PEEK slider variant survives the elevated ambient typical of these mill sections.<\/p>\n<\/p><\/div>\n<\/div>\n

Why Choose Ever-power for the EP6-70<\/h3>\n
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Quality Documentation<\/h4>\n

EP6-70 production runs under an ISO 9001:2015<\/strong> management system, with full material and dimensional traceability. RoHS<\/strong> and REACH<\/strong> conformity declarations are standard. CE<\/strong> documentation supports machinery-directive integrations across the EU. For oil-and-gas applications, supplementary NACE MR0175 material compatibility statements can be issued for stainless-hub variants.<\/p>\n

Customisation<\/h4>\n

Beyond the catalogue bore set (24 \/ 25 \/ 28 \/ 30 \/ 32 \/ 35 mm), Ever-power produces custom bores up to 40 mm, asymmetric bore pairings (e.g., 25 \u00d7 32 mm), keyway-broached bores to DIN\/JIS, stainless-steel hub variants, and PEEK slider upgrades. Logo-marking and OEM private labelling are available with documented quality controls.<\/p>\n

Production & Support<\/h4>\n

Monthly EP6-70 capacity exceeds 5 000 pieces across the bore matrix. For project-driven OEMs and fleet operators, Ever-power maintains buffer stock at customer-specific levels. Application engineers respond within 24 hours<\/strong>. Sea, air, and land freight are all supported globally; for plant-shutdown emergencies, expedited air freight is available within 48 hours of 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

Thailand \u2014 Air Compressor Package Builder<\/h4>\n

Used in:<\/em> Direct-drive connection between 18.5 kW motor and twin-screw compressor head on stationary plant packages.<\/p>\n

Feedback:<\/em> “Thermal growth between motor and head can reach 2 mm during start-up. The EP6-70’s 3.8 mm allowance handles this without imposing any radial side-load on the screw rotor bearings. We have standardised on the EP6-70 across our 15\u201322 kW package range and seen warranty claims for compressor-bearing failures drop to near-zero.”<\/p>\n<\/p><\/div>\n

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

South Africa \u2014 Mining Conveyor Operator<\/h4>\n

Used in:<\/em> Drive-end coupling on a 90 m underground belt conveyor moving copper ore.<\/p>\n

Feedback:<\/em> “Conveyor experiences intermittent shock loads from large rock-fall events. The EP6-70 polymer slider absorbs these shocks where our previous fluid coupling required hour-long restarts. Slider-replacement service interval is now scheduled at 18 months \u2014 minimal downtime, easy parts availability.”<\/p>\n<\/p><\/div>\n

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

Israel \u2014 Industrial Mixer Builder<\/h4>\n

Used in:<\/em> Reduction-output to impeller-shaft coupling on 15 kW class chemical mixers.<\/p>\n

Feedback:<\/em> “Replaced our previous chain-coupling specification, which had been failing prematurely under reactive-chemistry exposure. The PEEK slider variant we now use has been in service 14 months with no measurable wear. Knock one star only because we want a metric\/imperial mixed-bore catalogue option to cover US-shaft customers without custom lead time.”<\/p>\n<\/p><\/div>\n<\/div>\n

Frequently Asked Questions<\/h3>\n
\nWhat is the maximum continuous-duty power the EP6-70 can transmit?<\/summary>\n

At 2 300 rpm and rated 80 N\u00b7m, the EP6-70 transmits 19.3 kW continuously. Power capacity scales linearly with operating speed; at 1 500 rpm the continuous rating is approximately 12.5 kW. For sustained operation above 19 kW, please consult engineering for a stress-life evaluation.<\/p>\n<\/details>\n

\nHow does the EP6-70 compare to a steel-disc-pack coupling of similar rating?<\/summary>\n

Steel-disc-pack couplings at this torque rating offer marginally higher peak-torque endurance (typically 200 N\u00b7m peak) and lower mass (450 g vs ~600 g for a comparable steel coupling). The EP6-70 offsets these with a 4\u00d7 wider misalignment envelope, dramatically simpler installation, and an order of magnitude lower service cost over a 10-year lifecycle.<\/p>\n<\/details>\n

\nCan the EP6-70 be installed on key-locked shafts?<\/summary>\n

Yes \u2014 keyway broaching to DIN 6885 or JIS B 1301 standards is a routine custom-build option. Specify the keyway dimensions at order entry. Lead time addition is typically 5\u20137 working days. The combination of keyway and set-screw provides positive shaft engagement that does not migrate even under high-cycle reversal duty.<\/p>\n<\/details>\n

\nWhat is the expected service life under typical industrial duty?<\/summary>\n

For an EP6-70 operating at 60 % of rated load, with parallel offset below 2 mm and ambient under +70 \u00b0C, expected slider life exceeds 7 years of continuous duty. Slider-only replacement at end-of-life restores the coupling to as-new performance and takes typically 15 minutes including documentation.<\/p>\n<\/details>\n

\nIs on-site engineering support available for plant-scale specifications?<\/summary>\n

For fleet-scale projects and plant-wide specifications, Ever-power’s engineering desk can support remote engineering reviews via video conference. On-site visits can be arranged for projects with 1 000+ piece annual commitments; please contact the sales desk to discuss programme terms.<\/p>\n<\/details>\n

Specify the EP6-70 for Heavy-Duty Builds<\/h3>\n

For heavy industrial drive trains across compressor, conveyor, mixer, crane, and process applications, the EP6-70 delivers the rare combination of torque density, misalignment forgiveness, and field-serviceability that fleet engineers prize. Browse our complete heavy-duty Oldham coupling catalogue<\/a>, read about Ever-power’s industrial production capability<\/a>, or proceed directly to a quote enquiry below.<\/p>\n

\n Quote EP6-70 Now \u2192<\/a>\n<\/p>\n