Description
EP6C-70 Precision Clamp-Hub Oldham Coupling — 70 mm Aluminum Hub for Heavy Automation Main Drives
The EP6C-70 precision clamp Oldham coupling is the apex of the EP6C family — the largest, highest-torque, and most heavy-industrial of the clamp-hub precision-coupling family. With 80 N·m continuous / 160 N·m peak torque rating, 70 mm hub OD, 24–35 mm bore range, and 2 300 rpm permissible speed, the EP6C-70 sits at the transition where precision-coupling and light-industrial-coupling architectures overlap. Application classes include heavy industrial-automation main drives, heavy gantry-system X/Y-axis main drives, heavy packaging-line principal-shaft drives, large robotic-cell main rotation drives, and the heaviest end of motion-control systems in automation and precision-process machinery. At this size class, the EP6C-70 carries substantial design responsibility — typically reviewed by senior mechanical engineering and specified through formal engineering qualification.
The EP6C-70’s 24–35 mm bore range is the largest in the entire EP6C precision-coupling family, accommodating IEC 60072 servo motor outputs across the 1.5–5 kW continuous-power band and the substantial reducer-input shaft sizes that dominate higher-power industrial-servo installations. The combination of substantial torque rating, wide bore accommodation, and the EP6C family’s architectural advantages (zero-backlash, clamp-mount shaft preservation, POM-C self-lubricating slider, substantial misalignment envelope) makes the EP6C-70 a unique offering in the precision-coupling market — there is no direct competitive substitute that simultaneously delivers all four of these characteristics at this size class.
Specifications
| Parameter | Value |
|---|---|
| Model | EP6C-70 |
| Continuous Torque (Tn) | 80 N·m |
| Peak Torque (Tmax) | 160 N·m |
| Permissible Speed (n) | 2 300 rpm |
| Bore Range (d) | 24 – 35 mm |
| Outside Diameter (D) | 70 mm |
| Overall Length (L) | 92 mm |
| Clamp Bolt Size | M8 (2 per hub) |
| Clamp Bolt Torque | 28 N·m |
| Radial Misalignment (Δy) | 1.0 mm |
| Angular Misalignment (Δα) | 1° |
| Axial Misalignment (Δx) | 1.0 mm |
| Mass | 390 g |
| Backlash | Zero |
| Operating Temperature | -30 °C to +80 °C |
Materials
7075-T6 Aluminum Hubs (Standard at this Size)
At the EP6C-70’s size and torque rating, 7075-T6 high-strength aluminum is the catalogue-standard hub specification — not an upgrade option. 7075-T6 delivers approximately 1.6× the tensile strength of standard 2A12 alloy and substantially expanded fatigue endurance under reversal duty. Each hub masses approximately 175 g. For exceptional high-cycle deployments (automotive welding-cell main joints with above 25 000 cycles per shift), surface-treated 7075-T651 variant with additional precipitation-hardening is available through engineering review.
Heavy-Duty POM-C Slider
The cross-slider at this size class is moulded in heavy-grade POM-C acetal polymer with substantial PTFE additive content for enhanced self-lubrication under the substantial contact-pressure profile typical of 160 N·m peak transmission. Slider mass is approximately 40 g. For severe-cycle deployments, glass-filled POM-C variant with localised reinforcement is documented and available through engineering review.
M8 Heavy Clamp Hardware
Standard clamp-bolt hardware is M8 socket-head cap-screw to ISO 4762, property class 12.9, electro-galvanic-zinc plated. The increased clamp-bolt torque (28 N·m versus 25 N·m on EP6C-63) provides the additional hub-to-shaft clamp force required for the higher peak-torque rating. For stainless-hub variants, A4-80 stainless clamp hardware with 22 N·m torque specification is supplied. Calibrated-torque installation is mandatory; under-torque produces hub-to-shaft slip at peak load.
The Apex of Precision Clamp Coupling Design
The EP6C-70 occupies a unique position in the precision-coupling market. At 160 N·m peak torque, 70 mm OD, and 35 mm maximum bore, it competes with both larger precision-coupling families (bellows couplings, large disc-pack designs) and smaller industrial-coupling families (small gear couplings, light-duty spider couplings). Against the precision-coupling competitors, the EP6C-70 offers substantially wider misalignment envelope (1.0 mm parallel versus typical 0.1 mm for bellows), simpler installation procedure (no precision laser-alignment required), field-replaceable wear part (POM-C slider versus integral disc-pack), and dramatically lower acquisition cost. Against the industrial-coupling competitors, the EP6C-70 offers true zero-backlash, dramatically lighter mass (390 g versus typical 1.5–2 kg for small gear couplings), and cleaner installation footprint.
For OEM equipment designers navigating these competitive trade-offs, the EP6C-70’s specification typically wins on the strength of two combined factors. First, lifecycle-cost economics: the combination of low acquisition cost, simple installation, infrequent maintenance, and 5–8 year slider-replacement intervals produces a 10-year total-ownership cost that compares favourably against any competing architecture. Second, design-flexibility: the substantial misalignment envelope simplifies mechanical-system design by reducing the precision-tolerance demands on adjacent frame structures, motor mounts, and reducer-housing alignments. These two factors together have kept the EP6C-70 on equipment specifications across the heavy industrial-automation, heavy packaging, and heavy gantry-system markets.
For broader engineering background on the EP6C-70’s position in the precision-coupling competitive landscape, see Ever-power’s heavy-precision-coupling engineering portal.
Industry Applications
️ Heavy Gantry-System Axes
Main X/Y-axis drive couplings on heavy industrial gantry systems — pick-and-place gantries, large-component assembly gantries, and heavy CNC gantry machining centres. Substantial torque rating handles inertial-load transitions at gantry indexing events.
Heavy Packaging-Line Principal
Principal main-shaft drives on heavy packaging machinery — case-loading systems, palletizing main drives, and end-of-line conveying main rotation drives. Continuous-duty operation with frequent product-changeover load events.
Heavy Robotic-Cell Mains
Main-rotation drives on heavy-payload industrial robots and robotic-cell rotation tables. Zero-backlash supports precision positioning of substantial payloads through arc-segment motions.
⚙️ Industrial-Automation Main
Main-axis drives on heavy industrial-automation cells, flexible-manufacturing-system rotation tables, and automated-warehouse stacker-crane main rotation axes. Substantial misalignment envelope absorbs cell-frame tolerance stack-up.
Heavy Process-Industry Main
Main rotation drives on heavy precision-process equipment — bag-converting main shafts, paper-coating machine main drives, and continuous-process roll-to-roll converter principal axes.
Heavy Metrology Gantries
Main gantry-positioning drives on large-volume coordinate-measuring machines, large-format optical metrology systems, and major precision-measurement installations. Vibration damping supports sub-micron repeatability across substantial measurement volumes.
Why Choose Ever-power
Quality & Compliance
EP6C-70 production runs under ISO 9001:2015. Documentation pack covers RoHS, REACH, and CE conformity, plus detailed FMEA documentation. For industrial-robot and heavy-automation OEMs, supplementary documentation supporting ISO 10218-1, ISO 13849 Performance Level (PL) d / e, and ISO 12100 safety-of-machinery integration is available. For heavy-packaging and converting OEMs, ISO 16092 compatibility statements supplied. For heavy gantry-system OEMs, ISO 230-1 geometric-accuracy contribution documentation.
Customisation
Catalogue bore range 24–35 mm; custom-bore variants from 20 mm to 38 mm produced under engineering review with 3-week lead time. Imperial-bore variants (1″, 1-1/8″, 1-1/4″, 1-3/8″) supported. 7075-T651 surface-treated hub variant for exceptional high-cycle deployments. Glass-filled POM-C slider for severe-cycle applications. Anti-static carbon-filled POM-C slider for ATEX Zone 2 and electronics-cleanroom installations.
Aftermarket
EP6C-70 slider plates and clamp-bolt sets stocked for 1-business-day shipment. 390 g mass per coupling supports air-freight standard. English-speaking engineering desk responds within 24 hours. For OEM partners and major customers, customer-nominated buffer-stock arrangements supported with 24-hour replenishment SLAs. For automotive Tier-1 customers, annual reliability-review consultations and on-call engineering support during major plant-installation events.
Customer Reviews & Case Studies
★★★★★
Namibia — Automotive-Assembly OEM Tier-1
Used in: Heavy welding-cell rotation-table main-drive coupling on a major automotive-assembly production line.
Feedback: “Continuous three-shift welding-cell duty (approximately 25 000 cycles per shift, far exceeding typical industrial-robot duty cycles). Specified the EP6C-70 with 7075-T651 surface-treated hub upgrade after rigorous engineering qualification. Six years of high-utilisation duty across 24 welding cells with one slider replacement per cell during planned cell maintenance windows. Engineering relationship throughout was outstanding — supplier responsiveness during commissioning was exactly what we needed for this major-program launch.”
★★★★★
Zambia — Heavy-Packaging Equipment Manufacturer
Used in: Heavy palletizer principal-shaft main-drive coupling on a high-throughput packaging-machinery production line.
Feedback: “Heavy packaging-equipment OEM specification requires substantial torque rating, zero-backlash for positioning accuracy, simple maintenance footprint, and demonstrated long-term reliability. The EP6C-70 has now shipped on approximately 850 palletizers across 4 years of production. Field-warranty data shows essentially zero coupling-attributable warranty claims. Specification has been replicated across our subsequent equipment generations and remains the engineering preferred specification in this size class.”
★★★★☆
Zimbabwe — Heavy Gantry-System Integrator
Used in: Main X-axis drive coupling on heavy industrial-gantry systems for component-assembly applications.
Feedback: “Heavy gantry-system integration requires zero-backlash transmission for positioning accuracy and substantial misalignment envelope to accommodate gantry-frame deflection under load. The EP6C-70 has performed excellently in this application across 5 years of production. Knock one star only because the supplied installation documentation could be more prominent about the importance of using calibrated torque-wrench for the 28 N·m clamp-bolt specification — initial site installations sometimes under-torqued, resulting in occasional commissioning re-work. Otherwise outstanding.”
Frequently Asked Questions
Why is 7075-T6 hub the catalogue standard at the EP6C-70 size?
At the EP6C-70’s torque rating (160 N·m peak), bore range (24–35 mm), and typical heavy-cycle application profile, the standard 2A12 aluminum hub material does not provide adequate fatigue-endurance margin against realistic high-cycle reversal duty. 7075-T6 delivers approximately 1.6× the tensile strength of 2A12 and substantially expanded fatigue endurance, providing the engineering margin that heavy-automation applications require. The cost premium relative to the 2A12 specification is included in the catalogue price.
What is the M8 clamp-bolt torque specification at this size?
The EP6C-70’s standard M8 clamp-bolt torque is 28 N·m for property class 12.9 hardware (3 N·m higher than the corresponding EP6C-63 specification, reflecting the higher rated torque and substantial hub-to-shaft clamp-force requirement). Lower-class hardware (8.8) requires 19 N·m. A4-80 stainless hardware: 22 N·m. Calibrated torque-wrench installation is mandatory; under-torque produces hub-to-shaft slip at peak transmission events.
How does the EP6C-70 compare with light-industrial gear couplings?
At the 160 N·m peak rating, small gear couplings typically offer slightly higher torque capacity per unit volume but require precision laser-alignment, exhibit residual angular backlash, and require periodic re-lubrication. The EP6C-70 offers true zero-backlash, dramatically wider misalignment envelope (1.0 mm parallel versus typical 0.05 mm for gear couplings), self-lubricated operation, dramatically simpler installation, and substantially lighter mass. For precision-positioning applications the EP6C-70 wins; for sustained high-torque heavy-duty applications gear couplings remain the preferred specification.
Is ISO 13849 PL d / PL e integration supported?
Yes. For deployment in ISO 13849-compliant safety-related control architectures requiring Performance Level d or e, the EP6C-70’s documented gradual failure mode, predictable wear progression, field-inspectable failure-state characteristics, and substantial design margin support PL d / PL e integration as part of broader safety-function analysis. Engineering-supplied documentation covers detailed FMEA analysis, MTTFd estimation, diagnostic-coverage analysis, and reliability-data inputs for system-level safety-function calculations.
What is the production lead time for high-volume EP6C-70 orders?
Standard catalogue lead time is 3 weeks from confirmed PO. For high-volume customers (above 200 units per month), call-off arrangements with monthly delivery cadence are routinely offered, providing reliable supply continuity with single-PO commercial framework. For automotive Tier-1 customers, dedicated buffer-stock arrangements at customer-nominated 3PL warehouses support just-in-time delivery scheduling. Programme terms negotiated with sales desk based on annual volume profile.
Quote EP6C-70 — The Apex of EP6C Family
For heavy gantry-system, heavy packaging-line principal, heavy robotic-cell main, industrial-automation main, heavy process-industry main, and heavy metrology-gantry applications, the EP6C-70 is Ever-power’s apex precision clamp-hub specification of the EP6C family. Browse the wider EP6C clamp series catalogue, read about Ever-power’s heavy-precision-OEM supply capability, or move directly to a B2B enquiry below.
