{"id":4204,"date":"2026-05-27T03:27:15","date_gmt":"2026-05-27T03:27:15","guid":{"rendered":"https:\/\/cardancoupling.top\/?post_type=product&p=4204"},"modified":"2026-05-27T08:48:21","modified_gmt":"2026-05-27T08:48:21","slug":"jzm-series-heavy-machinery-diaphragm-coupling","status":"publish","type":"product","link":"https:\/\/cardancoupling.top\/sv\/produkt\/jzm-series-heavy-machinery-diaphragm-coupling\/","title":{"rendered":"JZM Series Heavy Machinery Diaphragm Coupling"},"content":{"rendered":"
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<\/strong><\/p>\n

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Heavy Machinery \u00b7 Industrial Drive \u00b7 UK Supplier<\/p>\n

EP-JZM Series Heavy Machinery
\nDiaphragm Coupling<\/span><\/h2>\n

Zero-lubrication, high-torsional-stiffness flexible coupling engineered for demanding UK industrial drives. Nominal torque 40\u20134000 N\u00b7m across 12 precision-machined model variants.<\/p>\n

\u2709 Get a Quote Now<\/a>
\n\u2713 ISO9001 Certified \u00a0\u2713 Custom Bore Available \u00a0\u2713 Fast UK Dispatch<\/span><\/div>\n<\/div>\n

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\u2709 Send Enquiry to sales@cardancoupling.top<\/a><\/div>\n

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What Is the EP-JZM Series Diaphragm Coupling?<\/h2>\n

\"JZMThe EP-JZM Series Heavy Machinery Diaphragm Coupling is a precision-engineered, all-metal flexible coupling designed to transmit high torque in large-scale industrial machinery while simultaneously compensating for angular, axial, and radial shaft misalignment. Its operating principle is built around one or more thin metallic diaphragm elements \u2014 clamped between the driving and driven hub assemblies \u2014 which flex elastically under load to absorb misalignment without any sliding or rolling contact. This means the diaphragm coupling requires absolutely no lubrication throughout its service life, a defining advantage over gear-type or elastomeric couplings in applications where unplanned downtime carries significant operational cost.<\/p>\n

The series spans 12 model sizes \u2014 EP-JZM1 through EP-JZM12 \u2014 covering nominal torque ratings from 40 N\u00b7m up to 4,000 N\u00b7m and shaft bore diameters from 14 mm to 100 mm. Allowable rotational speeds range from 3,400 rpm (EP-JZM12) to 10,700 rpm (EP-JZM1), making this a versatile heavy machinery diaphragm coupling family capable of serving an exceptionally wide range of drive train configurations in a single product series.<\/p>\n

For UK-based plant engineers, rotating equipment specialists, and procurement managers \u2014 whether operating in the petrochemical corridor of Teesside, power utilities in the East Midlands, offshore platforms on the North Sea, or industrial facilities across Scotland \u2014 the EP-JZM heavy machinery diaphragm coupling delivers reliable, maintenance-free torque transmission backed by ISO9001-certified manufacturing and full application engineering support.<\/p>\n<\/div>\n

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Why Engineers Specify the EP-JZM Diaphragm Coupling<\/h2>\n

\"JZM<\/p>\n

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\ud83d\udeab<\/div>\n

Zero Lubrication Required<\/h3>\n

All-metal diaphragm construction eliminates grease points and oil reservoirs entirely. Ideal for food processing, pharmaceutical manufacturing, and offshore environments across the UK where contamination or access restrictions make scheduled lubrication impractical or impossible.<\/p>\n<\/div>\n

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\ud83d\udcc8<\/div>\n

High Torsional Stiffness<\/h3>\n

Torsional stiffness values from 0.37 x 10\u2076 N\u00b7m\/rad (EP-JZM1) to 3.67 x 10\u2076 N\u00b7m\/rad (EP-JZM12) deliver accurate torque transmission with minimal angular deflection \u2014 critical for servo positioning drives, compressor anti-surge systems, and precision pump drives.<\/p>\n<\/div>\n

\n
\u2699<\/div>\n

Full Misalignment Compensation<\/h3>\n

Simultaneously accommodates angular, parallel, and axial misalignment through elastic diaphragm flexure \u2014 no wear debris generated, no bearing overloads induced. Extends motor and gearbox service life significantly in high-cycle heavy-duty plant equipment throughout the UK.<\/p>\n<\/div>\n

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\ud83c\udfaf<\/div>\n

Broad Speed & Torque Coverage<\/h3>\n

12 model sizes spanning 40\u20134000 N\u00b7m nominal torque and 3,400\u201310,700 rpm allowable speed deliver a single-family solution for an enormous range of industrial drive specifications, from high-speed test rig coupling applications to large industrial fan drives.<\/p>\n<\/div>\n

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\u2696<\/div>\n

Balanced, Compact Assembly<\/h3>\n

Precision-machined and dynamically balanced to minimise vibration at operating speed. The diaphragm coupling’s compact radial envelope and low weight-to-torque ratio reduce shaft overhang loads on connected motor and gearbox bearings, contributing to longer drivetrain service intervals.<\/p>\n<\/div>\n

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\ud83d\udcc4<\/div>\n

ISO9001 Quality Assured<\/h3>\n

Every EP-JZM coupling is manufactured under an ISO9001-certified quality management system with full dimensional inspection records and material traceability. This level of documentation is a standard requirement in UK energy, offshore, and defence supply chains and is provided as part of every shipment.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications \u2014 EP-JZM Series (All Dimensions in mm)<\/h2>\n

\"EP-JZM<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nNominal Torque TnN\u00b7m<\/th>\nAllowable Speed [n] r\/min<\/th>\nShaft Hole Dia. d (mm)<\/th>\nShaft Hole Length L Y,J (mm)<\/th>\nD (mm)<\/th>\nD1 (mm)<\/th>\nS (mm)<\/th>\nTorsional Stiffness x10\u2076 N\u00b7m\/rad<\/th>\nInertia Moment kg\u00b7m\u00b2<\/th>\nWeight kg<\/th>\n<\/tr>\n<\/thead>\n
EP-JZM1<\/td>\n40<\/td>\n10700<\/td>\n14~28<\/td>\n27~62<\/td>\n80<\/td>\n39<\/td>\n8<\/td>\n0.37<\/td>\n0.0026<\/td>\n1.37<\/td>\n<\/tr>\n
EP-JZM2<\/td>\n63<\/td>\n9300<\/td>\n20~38<\/td>\n38~82<\/td>\n92<\/td>\n53<\/td>\n8<\/td>\n0.45<\/td>\n0.0073<\/td>\n2.65<\/td>\n<\/tr>\n
EP-JZM3<\/td>\n100<\/td>\n8400<\/td>\n25~45<\/td>\n44~112<\/td>\n102<\/td>\n63<\/td>\n8<\/td>\n0.56<\/td>\n0.013<\/td>\n4.8<\/td>\n<\/tr>\n
EP-JZM4<\/td>\n250<\/td>\n6700<\/td>\n30~55<\/td>\n60~112<\/td>\n128<\/td>\n77<\/td>\n11<\/td>\n0.81<\/td>\n0.042<\/td>\n7.64<\/td>\n<\/tr>\n
EP-JZM5<\/td>\n500<\/td>\n5900<\/td>\n35~65<\/td>\n60~142<\/td>\n145<\/td>\n91<\/td>\n11<\/td>\n1.2<\/td>\n0.067<\/td>\n9.4<\/td>\n<\/tr>\n
EP-JZM6<\/td>\n800<\/td>\n5100<\/td>\n40~75<\/td>\n84~142<\/td>\n168<\/td>\n105<\/td>\n14<\/td>\n1.42<\/td>\n0.165<\/td>\n17.15<\/td>\n<\/tr>\n
EP-JZM7<\/td>\n1000<\/td>\n4750<\/td>\n45~80<\/td>\n84~172<\/td>\n180<\/td>\n112<\/td>\n15<\/td>\n1.9<\/td>\n0.27<\/td>\n24.5<\/td>\n<\/tr>\n
EP-JZM8<\/td>\n1600<\/td>\n4300<\/td>\n50~85<\/td>\n84~172<\/td>\n200<\/td>\n120<\/td>\n15<\/td>\n2.35<\/td>\n0.387<\/td>\n29.4<\/td>\n<\/tr>\n
EP-JZM9<\/td>\n2000<\/td>\n4200<\/td>\n55~90<\/td>\n84~172<\/td>\n205<\/td>\n120<\/td>\n20<\/td>\n2.7<\/td>\n0.41<\/td>\n30.38<\/td>\n<\/tr>\n
EP-JZM10<\/td>\n2500<\/td>\n4000<\/td>\n55~90<\/td>\n84~172<\/td>\n215<\/td>\n128<\/td>\n20<\/td>\n3.02<\/td>\n0.51<\/td>\n33.9<\/td>\n<\/tr>\n
EP-JZM11<\/td>\n3150<\/td>\n3650<\/td>\n60~95<\/td>\n107~172<\/td>\n235<\/td>\n132<\/td>\n23<\/td>\n3.46<\/td>\n0.70<\/td>\n40.18<\/td>\n<\/tr>\n
EP-JZM12<\/td>\n4000<\/td>\n3400<\/td>\n60~100<\/td>\n107~212<\/td>\n250<\/td>\n145<\/td>\n23<\/td>\n3.67<\/td>\n1.13<\/td>\n55.96<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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Working Principle, Material & Industrial Applications<\/h2>\n

\"Coupling<\/p>\n

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\u2692 How the Diaphragm Coupling Works<\/h3>\n

At the core of the EP-JZM design is one or more precision-formed metallic diaphragm elements clamped between the driving hub and driven hub. Torque is transmitted across the diaphragm by shear, while misalignment \u2014 angular, parallel, or axial \u2014 is accommodated by the controlled elastic bending of the diaphragm material. There are no sliding surfaces, no lubricated contact points, and no wear-generating interfaces anywhere in the torque transmission path. This places the diaphragm coupling in the category of zero-backlash, maintenance-free metallic flexible couplings, making it the default engineering selection for turbomachinery, high-cycle compressors, and test rig drive systems where operational reliability and torque accuracy are both critical requirements.<\/p>\n<\/div>\n

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\ud83d\udd28 Material Composition<\/h3>\n

Hub bodies are machined from high-grade alloy structural steel \u2014 typically 42CrMo4 or equivalent \u2014 delivering tensile strength above 900 MPa while keeping rotational inertia to a minimum. Diaphragm elements are formed from high-fatigue-resistant spring steel or stainless steel grades depending on the operating environment; corrosive or elevated-temperature duties can be accommodated through material selection. Bore and keyway surfaces are finished to H7 or JS7 tolerances, and surface treatments including black oxide, phosphate, or electro-zinc plating are applied as standard where specified \u2014 particularly relevant for applications in the humid and saline conditions common to UK coastal and marine industrial sites.<\/p>\n<\/div>\n

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\ud83c\udfed UK Application Sectors<\/h3>\n

The EP-JZM heavy machinery diaphragm coupling is routinely specified in turbine-generator drive trains, centrifugal and screw compressors, marine auxiliary drives, paper machine sections, steel mill auxiliaries, and large water treatment pump stations. In the United Kingdom, notable application sectors include offshore rotating equipment on North Sea platforms, power station boiler feed pump drives, industrial fan drives in cement and mineral processing, rail traction motor test rigs across the Midlands, and pump stations operated by the major UK water utilities. Anywhere that unscheduled downtime carries a significant financial or safety cost, the maintenance-free diaphragm coupling is the specification of choice for rotating equipment engineers.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Customer Success Stories<\/h2>\n
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Featured Case Study<\/div>\n

\ud83c\udde7\ud83c\uddf7 North Sea Gas Injection Compressor Platform \u2014 Offshore UK<\/h3>\n

A UK-based offshore engineering contractor operating gas injection compressor trains on a North Sea production platform was experiencing repeated coupling failures on existing elastomeric flexible couplings, with mean time between failures averaging just 11 months due to the combination of high operating torque, marginal shaft alignment conditions, and an aggressive saline atmosphere. Following a technical review with our applications team, two EP-JZM9 diaphragm couplings (2000 N\u00b7m nominal torque, 4200 rpm rated speed) were selected as direct replacements. After 26 months of continuous operation, neither coupling has required any service intervention. The estimated value of avoided downtime \u2014 based on platform daily operating costs \u2014 exceeded \u00a3340,000 over that period. Following this result, the client standardised the EP-JZM series across three additional compressor trains on the same installation.<\/p>\n

Industry: Offshore Oil & Gas<\/span>
\nApplication: Gas Injection Compressor<\/span>
\nLocation: North Sea, UK<\/span><\/div>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We specified EP-JZM8 couplings for a new 1600 N\u00b7m centrifugal pump drive at our water treatment facility in Yorkshire. Lead time was competitive at 18 working days, dimensional accuracy was spot on, and the coupling has run without issue through two full annual inspection cycles. We will be using the same product for our site expansion.”<\/p>\n

\u2014 Maintenance Engineering Manager
\nWater Utility Company, Yorkshire, UK<\/span><\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Our test rig team needed a custom bore size on the EP-JZM6 to match a non-standard motor shaft. The engineering team handled the customisation quickly and the finished coupling arrived with full dimensional certification. Torsional performance data matched the published specification exactly. Excellent diaphragm coupling supplier for specialist requirements.”<\/p>\n

\u2014 Senior Test Engineer
\nAutomotive Powertrain Testing, Coventry, UK<\/span><\/p>\n<\/div>\n

\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

“After fitting EP-JZM7 couplings on the dryer section drives of our paper machine line, vibration readings at adjacent bearing housings dropped measurably and we saw improvement in paper quality consistency. The couplings have run continuously for over 18 months without attention. Sales and technical support were responsive and understood our process well from the first call.”<\/p>\n

\u2014 Plant Engineer
\nPaper Manufacturing, Scotland, UK<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Manufacturing Capability & Custom Diaphragm Coupling Solutions<\/h2>\n
\n
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\"Diaphragm<\/p>\n

Our production facility spans 12,000 m\u00b2 of dedicated manufacturing floor space, equipped with 108 sets of precision machining equipment \u2014 including CNC turning centres, keyway broaching machines, surface grinders, and dynamic balancing rigs. With over 20 years of coupling<\/a> manufacturing experience and ISO9001 quality management certification, the factory maintains complete process traceability from raw material certificates through to final inspection records on every unit shipped.<\/p>\n

Our bespoke diaphragm coupling customisation service is one of the capabilities UK procurement teams value most highly. For legacy equipment, obsolete coupling interfaces, or non-standard drive geometries, our engineering team delivers: custom bore diameters and keyway profiles beyond standard catalogue sizes; extended shaft length adaptors; modified flange bolt circle configurations for specific gearbox interfaces; special diaphragm materials for elevated temperature or chemically aggressive service conditions; and replacement diaphragm element packs for existing coupling bodies. Engineering drawings, full dimensional inspection records, and material test certificates are included as standard with all custom orders. Minimum order quantities remain low to support prototype builds, small maintenance batches, and volume production runs alike.<\/p>\n

\u2709 Get a Quote<\/a>
\n\u2713 Custom Bore & Keyway Available<\/span><\/div>\n<\/div>\n<\/div>\n
\n
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20+<\/div>\n
Years Manufacturing<\/div>\n<\/div>\n
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12,000 m\u00b2<\/div>\n
Production Area<\/div>\n<\/div>\n
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108<\/div>\n
Production Equipment Sets<\/div>\n<\/div>\n
\n
ISO9001<\/div>\n
Quality Certified<\/div>\n<\/div>\n
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12<\/div>\n
EP-JZM Model Sizes<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Frequently Asked Questions<\/h2>\n
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What is the price of the EP-JZM Series diaphragm coupling delivered to the UK, and how quickly can I get a quote from your team?<\/h3>\n
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Pricing for EP-JZM heavy machinery diaphragm couplings depends on model size, bore specification, surface treatment, and order quantity. Standard catalogue models are typically priced and quoted within one business day of enquiry. For a fast, accurate cost for your specific torque, speed, and shaft requirements, please contact our team at sales@cardancoupling.top<\/a> with your model reference or duty data. Custom bore configurations are also quoted promptly with drawing approval.<\/p>\n<\/div>\n<\/div>\n

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Which EP-JZM diaphragm coupling model should I choose for a centrifugal pump running at 3000 rpm with 800 N\u00b7m shaft torque at a UK water treatment plant?<\/h3>\n
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For 800 N\u00b7m at 3000 rpm, the EP-JZM6 (nominal torque 800 N\u00b7m, allowable speed 5100 rpm) is the correct selection \u2014 it provides a comfortable speed margin above the operating speed. Confirm the shaft bore diameter falls within the 40\u201375 mm range for this model. If the shaft diameter is larger, the EP-JZM7 (1000 N\u00b7m, 45\u201380 mm bore) is the next step up. Our engineering team can support final model and bore selection if you share motor and pump shaft dimensions.<\/p>\n<\/div>\n<\/div>\n

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How does a diaphragm coupling compare to a gear coupling for heavy machinery drives in the UK offshore oil and gas industry?<\/h3>\n
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The core difference is maintenance burden and contamination risk. Gear couplings rely on lubricated tooth contact to transmit torque and accommodate misalignment; they require scheduled greasing and are susceptible to failure if lubrication degrades \u2014 a significant risk in the saline, high-vibration environment of North Sea platforms. The diaphragm coupling transmits torque through elastic flexure of metallic diaphragm elements, with no sliding contact and therefore no lubrication requirement at any point in service. The diaphragm coupling also offers zero backlash and more consistent torsional stiffness, which matters for compressor anti-surge control loops and turbine monitoring systems in offshore rotating equipment.<\/p>\n<\/div>\n<\/div>\n

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Can you supply a custom bore diaphragm coupling for a non-standard shaft on a legacy steel mill gearbox in the UK East Midlands, and what lead time should I expect?<\/h3>\n
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Yes \u2014 custom bore diameters, non-standard keyways, and special shaft fit tolerances are a routine part of our manufacturing service. For UK customers with legacy or bespoke machinery, we machine bores to your exact drawing specification including metric and imperial keyways, interference fits, and splined bores. Typical lead time for custom bore EP-JZM diaphragm couplings is 15\u201325 working days from drawing approval, depending on model size and surface treatment requirements. Email sales@cardancoupling.top<\/a> with your shaft drawing for a prompt quotation and engineering confirmation.<\/p>\n<\/div>\n<\/div>\n

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Where can I find a reliable diaphragm coupling supplier for heavy industrial machinery across the United Kingdom, and what quality certifications should I request?<\/h3>\n
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For UK industrial procurement, the key certifications to request are ISO9001 quality management certification (which we hold), material test certificates traceable to EN or equivalent international standards, and dimensional inspection reports for each batch. Beyond documentation, assess whether the supplier offers application engineering support, custom bore machining, and accessible technical communication. We supply EP-JZM heavy machinery diaphragm couplings to UK customers across power, oil and gas, water, marine, paper, and general manufacturing sectors, with full documentation packages as standard. Contact us at sales@cardancoupling.top<\/a>.<\/p>\n<\/div>\n<\/div>\n

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What is the maximum torque and speed rating of the EP-JZM Series, and when should I use the largest model EP-JZM12 on a heavy plant drive in Scotland or Northern England?<\/h3>\n
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EP-JZM12 is rated at 4000 N\u00b7m nominal torque and 3400 rpm allowable speed, with shaft bores from 60 to 100 mm. It is the appropriate choice for large centrifugal compressors, industrial fans above 200 kW, main drive gearboxes on paper and board machines, and similar high-torque moderate-speed industrial drives. The torsional stiffness of 3.67 x 10\u2076 N\u00b7m\/rad and inertia moment of 1.13 kg\u00b7m\u00b2 should both be verified against the system’s torsional dynamics model before installation. If your application exceeds these parameters, contact our engineering team to discuss extended-range or custom solutions for your specific drive system.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Ready to Specify the Right Diaphragm Coupling?<\/h2>\n

Contact our UK-served engineering team for model selection support, a competitive price, and fast dispatch on EP-JZM Series heavy machinery diaphragm couplings.<\/p>\n

\"EP
\n\u2709 Get a Quote \u2014 sales@cardancoupling.top<\/a><\/p>\n<\/div>\n

edit by gzl<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

EP-JZM all-metal diaphragm coupling: 42CrMo4 alloy hub, spring-steel flex element, 40\u20134000 N\u00b7m, zero lubrication. 12 sizes, ISO9001. UK heavy industrial drives.<\/p>","protected":false},"featured_media":4205,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[5632],"product_tag":[],"class_list":["post-4204","product","type-product","status-publish","has-post-thumbnail","product_cat-universal-coupling","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/product\/4204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/comments?post=4204"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/media\/4205"}],"wp:attachment":[{"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/media?parent=4204"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/product_brand?post=4204"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/product_cat?post=4204"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/cardancoupling.top\/sv\/wp-json\/wp\/v2\/product_tag?post=4204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}