{"id":784,"date":"2026-06-23T09:47:10","date_gmt":"2026-06-23T09:47:10","guid":{"rendered":"https:\/\/oldhamcoupling.net\/product\/ep6c-50-precision-clamp-oldham-coupling\/"},"modified":"2026-06-24T08:47:43","modified_gmt":"2026-06-24T08:47:43","slug":"ep6c-50-precision-clamp-oldham-coupling","status":"publish","type":"product","link":"https:\/\/oldhamcoupling.net\/tr\/urun\/ep6c-50-precision-clamp-oldham-coupling\/","title":{"rendered":"EP6C-50 Precision Clamp Oldham Coupling"},"content":{"rendered":"
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EP6C-50 Precision Clamp-Hub Oldham Coupling \u2014 50 mm Aluminum Hub for SCARA-Robot and Lithography-Stage Drives<\/h2>\n

The EP6C-50 precision clamp Oldham coupling<\/strong> moves the EP6C family into the duty class where servo torque and rotational accuracy intersect with substantial mechanical demand. With 19 N\u00b7m continuous \/ 38 N\u00b7m peak torque rating, 50 mm hub OD, 14\u201320 mm bore range, and 3 000 rpm permissible speed, the EP6C-50 is sized for SCARA-robot shoulder-axis drives, photolithography stage-positioning axes, semiconductor-front-end wet-process indexing drives, and the precision-packaging machinery main rotation drives that anchor higher-end pharma and food packaging lines. Across these application classes, the EP6C-50 delivers a combination of torque capacity, zero-backlash transmission, and shaft-preserving clamp mounting that the alternatives \u2014 bellows couplings, disc-pack couplings, oversized spider couplings \u2014 cannot simultaneously achieve.<\/p>\n

An engineering detail worth noting at the EP6C-50 size: the hub bore range extends to 20 mm, accommodating the larger encoder-output shafts and reducer-input shafts typical of higher-torque servo systems. This bore range corresponds directly to the IEC 60072 standard frame-mounted servo motor output specifications for the 200\u2013400 W power class \u2014 making the EP6C-50 a precise fit for the dominant population of mid-power industrial servo installations. OEM equipment designers specifying the EP6C-50 will find it integrates naturally with this servo-system population through dimensional accommodation that does not require non-standard adapter parts or bushing modifications.<\/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>\nEP6C-50<\/td>\n<\/tr>\n
Continuous Torque (Tn)<\/td>\n19 N\u00b7m<\/td>\n<\/tr>\n
Peak Torque (Tmax)<\/td>\n38 N\u00b7m<\/td>\n<\/tr>\n
Permissible Speed (n)<\/td>\n3 000 rpm<\/td>\n<\/tr>\n
Bore Range (d)<\/td>\n14 \u2013 20 mm<\/td>\n<\/tr>\n
Outside Diameter (D)<\/td>\n50 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n66 mm<\/td>\n<\/tr>\n
Clamp Bolt Size<\/td>\nM6 (2 per hub)<\/td>\n<\/tr>\n
Clamp Bolt Torque<\/td>\n10 N\u00b7m<\/td>\n<\/tr>\n
Radial Misalignment (\u0394y)<\/td>\n0.6 mm<\/td>\n<\/tr>\n
Angular Misalignment (\u0394\u03b1)<\/td>\n1\u00b0<\/td>\n<\/tr>\n
Axial Misalignment (\u0394x)<\/td>\n0.6 mm<\/td>\n<\/tr>\n
Mass<\/td>\n155 g<\/td>\n<\/tr>\n
Backlash<\/td>\nZero<\/td>\n<\/tr>\n
Operating Temperature<\/td>\n-30 \u00b0C to +80 \u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"EP6C-50<\/p>\n

Materials<\/h3>\n
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2A12 \/ 7075-T6 Aluminum Clamp Hubs<\/h4>\n

Standard hub material is 2A12 aluminum alloy with anodised surface treatment. For high-cycle deployments (industrial robots, packaging-line main drives with frequent reversal duty), 7075-T6 high-strength variant is the engineering-preferred upgrade \u2014 its higher tensile strength delivers expanded margin against the substantial M6 clamp-bolt torque-induced hoop stress and accommodates the peak-torque excursions of dynamic-control servo systems. Each hub masses approximately 70 g.<\/p>\n<\/p><\/div>\n

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POM-C Self-Lubricating Slider<\/h4>\n

Precision-injection-moulded POM-C acetal polymer with PTFE additive for self-lubrication across the full -30 \u00b0C to +80 \u00b0C operating range. POM-C delivers consistent friction coefficient across the operating temperature window, inherent vibration damping, and electrical-isolation between drive and driven shafts. For lithography stage applications requiring very low particulate emission, a USP Class VI-compatible POM-C variant with extra-stringent particulate certification is offered.<\/p>\n<\/p><\/div>\n

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M6 Class 12.9 Clamp Hardware<\/h4>\n

Standard clamp-bolt hardware is M6 socket-head cap-screw to ISO 4762, property class 12.9, electro-galvanic-zinc plated. For stainless-hub variants, A4-80 stainless clamp hardware is supplied. The increased clamp-bolt size (M6 versus M5 on EP6C-40) provides expanded torque margin for the higher rated torque level and accommodates the larger bore range. Calibrated-torque installation is essential for production environments \u2014 clamp-bolt torque-verification is a recommended quality-checkpoint step.<\/p>\n<\/p><\/div>\n<\/div>\n

Engineering for SCARA-Robot Shoulder Axes<\/h3>\n

SCARA robots \u2014 Selective Compliance Articulated Robot Arms \u2014 operate within a specific engineering envelope that favours the EP6C-50’s architectural characteristics. The shoulder-axis (also called the J1 axis) typically carries the largest reduction-ratio and the highest torque demand of the entire robot kinematic chain, with the arm payload swinging through wide arcs at substantial speed. The drive coupling between the shoulder-axis motor and reducer input shaft must transmit substantial torque, accommodate the unavoidable parallel-misalignment of the motor-and-reducer-frame stack-up, deliver zero-backlash for end-effector positioning accuracy, and survive an indefinitely large number of reversal cycles without measurable wear.<\/p>\n

The EP6C-50 meets each of these requirements through specific architectural features. The 38 N\u00b7m peak torque rating provides comfortable margin against the typical 20\u201328 N\u00b7m peak demands of mid-power SCARA shoulder drives. The 0.6 mm parallel-misalignment envelope absorbs the realistic frame-tolerance accumulation. The zero-backlash transmission supports the sub-arcminute positioning repeatability of higher-end SCARA designs. And the POM-C slider’s documented unlimited fatigue life under reversal duty \u2014 combined with the clamp-mount’s unlimited installation cycles \u2014 addresses the reliability profile that high-utilisation production robots require. The combined offering has kept the EP6C-50 on SCARA robot specifications across multiple equipment generations and robot-OEM brand portfolios.<\/p>\n

For further engineering background on SCARA and articulated-robot joint-drive coupling specification, see Ever-power’s robotics-coupling engineering portal<\/a>.<\/p>\n

\"EP6C-50<\/p>\n

Industry Applications<\/h3>\n
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<\/span> SCARA-Robot Shoulder Axes<\/h4>\n

J1 and J2 axis drives on SCARA robots in electronics assembly, pharmaceutical packaging, and food-handling automation. Zero-backlash supports sub-arcminute positioning repeatability; clamp-mount preserves shaft surface across upgrades.<\/p>\n<\/p><\/div>\n

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<\/span> Photolithography Stage Axes<\/h4>\n

X-Y stage and wafer-rotation drives on photolithography exposure systems, mask aligners, and direct-write laser-pattern systems. POM-C slider damps motor-side vibration content from reaching the precision stage.<\/p>\n<\/p><\/div>\n

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<\/span> Semiconductor Wet-Process<\/h4>\n

Wet-bench indexing drives, chemical-mechanical polishing (CMP) wafer-rotation auxiliaries, and clean-process robot end-effector rotation axes. Stainless clamp-bolt variant supports chemical-process ambient compatibility.<\/p>\n<\/p><\/div>\n

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<\/span> Precision Packaging Machine Main<\/h4>\n

Main rotation drives on tablet-press main turrets, blister-pack machine indexing, and high-speed cartoning-machine main shafts. Pharma USP Class VI compatibility through POM-C slider variant.<\/p>\n<\/p><\/div>\n

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\ufe0f<\/span> Digital Printing Press Auxiliary<\/h4>\n

Sheet-feeder, registration-roller, and impression-cylinder auxiliary-drive axes on digital and offset printing presses. POM-C slider tolerates ink-mist ambient through chemical-resistance.<\/p>\n<\/p><\/div>\n

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<\/span> CMM & Optical Stage Drives<\/h4>\n

Coordinate-measuring-machine (CMM) probe-rotation axes, scientific-instrument turret drives, and precision-optics-bench stage drives. Vibration damping and zero-backlash support sub-micron measurement repeatability.<\/p>\n<\/p><\/div>\n<\/div>\n

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

EP6C-50 production runs under ISO 9001:2015<\/strong>. Documentation pack covers RoHS<\/strong>, REACH<\/strong>, and CE<\/strong> conformity. For pharma packaging-line customers, USP Class VI documentation for the POM-C slider is supplied as standard. For semiconductor-OEM customers, SEMI standard particulate-emission documentation supports cleanroom-class qualification. For robotics-OEM customers, supplementary documentation supporting industrial-robot safety standard ISO 10218 integration is available.<\/p>\n

Customisation<\/h4>\n

Catalogue bore range 14\u201320 mm; custom-bore variants from 12 mm to 22 mm produced under engineering review with 2-week lead time. Imperial-bore variants (5\/8″, 3\/4″, 7\/8″) supported. 7075-T6 high-strength aluminum hub variant for reversal-duty robotics. Anti-static carbon-filled POM-C slider for ATEX Zone 2 and electronics-cleanroom installations. USP Class VI POM-C variant for pharma-validation documentation requirements.<\/p>\n

Aftermarket<\/h4>\n

EP6C-50 slider plates and clamp-bolt sets stocked for 1-business-day shipment. 155 g mass per coupling supports air-freight standard. English-speaking engineering desk responds within 24 hours<\/strong>. For OEM partners and high-volume customers, customer-nominated buffer-stock arrangements supported with 24-hour replenishment SLAs.<\/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

Georgia \u2014 Industrial-Robotics OEM<\/h4>\n

Used in:<\/em> J2 shoulder-axis drive coupling on a four-axis SCARA robot model for electronics-assembly applications.<\/p>\n

Feedback:<\/em> “Specified the EP6C-50 with 7075-T6 hub upgrade after detailed evaluation against bellows-coupling and disc-pack alternatives. The EP6C-50 has now shipped on approximately 2 200 SCARA units across 3 years of production. Field-warranty rate is meaningfully below the rate seen with the previous bellows-coupling specification. The clamp-mount has eliminated the shaft-marking complaint category from our warranty data entirely.”<\/p>\n<\/p><\/div>\n

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

Azerbaijan \u2014 Pharma Tablet-Press Operator<\/h4>\n

Used in:<\/em> Tablet-press main-turret indexing-drive coupling on a high-speed tablet-press production line.<\/p>\n

Feedback:<\/em> “Pharma validation requirements made the original spider-coupling specification difficult \u2014 the elastomer material did not have full USP Class VI documentation that our regulatory team could accept. Switched to the EP6C-50 with USP Class VI POM-C slider; full documentation pack supported validation closure without additional regulatory work. Five years of three-shift production duty without coupling-attributable downtime. Excellent regulatory-aligned specification.”<\/p>\n<\/p><\/div>\n

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

Tajikistan \u2014 Semiconductor Test-Assembly<\/h4>\n

Used in:<\/em> Wet-bench wafer-handling robot wrist-axis drive on a semiconductor-back-end test facility.<\/p>\n

Feedback:<\/em> “Chemical-process ambient and continuous-three-shift production. The EP6C-50 with stainless clamp-bolt hardware has handled 4 years of duty across 18 wet-bench cells without coupling-attributable failure. Knock one star only because the initial lead time for the stainless-bolt variant was 3 weeks rather than the standard 2 weeks during a peak ordering period \u2014 engineering response addressed this through expedited production for our subsequent orders. Otherwise outstanding.”<\/p>\n<\/p><\/div>\n<\/div>\n

Frequently Asked Questions<\/h3>\n
\nWhat is the M6 clamp-bolt torque specification?<\/summary>\n

The standard M6 clamp-bolt torque is 10 N\u00b7m for property class 12.9 hardware. Lower-class hardware (e.g., property class 8.8) requires 7 N\u00b7m. For A4-80 stainless clamp-bolt variants, torque is 8 N\u00b7m. The increased torque relative to EP6C-40’s M5 specification reflects the larger bolt cross-section and the higher rated torque. Calibrated torque-wrench installation is essential.<\/p>\n<\/details>\n

\nDoes the EP6C-50 work with IEC 60072 standard servo motor shafts?<\/summary>\n

Yes \u2014 the 14\u201320 mm bore range corresponds directly to IEC 60072 standard frame-mounted servo motor output specifications for the 200\u2013400 W power class. The EP6C-50 integrates with IEC 60072-compliant servo motors without requiring non-standard adapter parts or bushing modifications. Coupling-to-motor-flange face-to-face spacing accommodates standard reducer-input shaft lengths.<\/p>\n<\/details>\n

\nWhat is the USP Class VI compatibility documentation?<\/summary>\n

USP (United States Pharmacopeia) Class VI is the highest classification for biological-compatibility of pharmaceutical-contact materials. The POM-C slider’s USP Class VI documentation includes systemic-injection, intracutaneous, and implantation testing results showing biological compatibility. The documentation supports pharma-validation closure for tablet-press, blister-pack, and other pharma-process equipment installations where the coupling is in proximity to pharmaceutical product flow.<\/p>\n<\/details>\n

\nHow does the EP6C-50 handle reversal-duty in robotics?<\/summary>\n

SCARA and articulated-robot deployments routinely involve reversal duty \u2014 the J1\/J2 axis swings back and forth through wide arcs at substantial frequency. The EP6C-50’s POM-C slider has documented unlimited fatigue life under reversal-duty conditions, and the cross-slider architecture’s transmission is identical in both rotation directions. For high-cycle robotics (above 5 000 cycles per shift), the 7075-T6 hub upgrade is the engineering-preferred specification to address aluminum-hub fatigue accumulation in the clamp-section.<\/p>\n<\/details>\n

\nIs the EP6C-50 supported for ISO 10218 robotics safety standard integration?<\/summary>\n

Yes. The EP6C-50 is a mechanical asset with no electrical components, and does not require independent safety certification. For deployment in ISO 10218-compliant industrial robot designs, supplementary documentation covering the coupling’s failure-mode profile, gradual wear characteristics, and predictable maintenance routine supports straightforward Category 2 \/ Category 3 safety-function analysis. Please consult Ever-power engineering for application-specific safety documentation requirements.<\/p>\n<\/details>\n

Quote EP6C-50 for SCARA-Robot and Lithography Applications<\/h3>\n

For SCARA-robot shoulder, photolithography stage, semiconductor wet-process, precision packaging-machine main, digital-printing-press auxiliary, and CMM applications, the EP6C-50 is Ever-power’s preferred precision clamp-hub specification across the mid-bore servo range. Browse the wider EP6C clamp series catalogue<\/a>, read about Ever-power’s precision-OEM supply capability<\/a>, or move directly to a B2B enquiry below.<\/p>\n

\n Quote EP6C-50 \u2192<\/a>\n<\/p>\n