A dual mass flywheel is a precision driveline assembly, not a simple commodity casting. For Hyundai-fitment applications, procurement teams must control dimensional accuracy, torsional damping behaviour, starter ring gear geometry, clutch interface, balance, packaging protection and batch traceability. A typical aftermarket DMF can weigh 10–18 kg, include 100+ controlled features, and fail in service because of a 0.20 mm stack-height error, incorrect ring-gear offset, poor grease control, or an unapproved spring change. The supplier decision affects warranty exposure, workshop installation time, catalogue accuracy, noise and vibration performance, and container-level delivery reliability.
Driventus Auto Parts manufactures engine and powertrain components in Taizhou, Zhejiang, and supplies aftermarket distributors, OEM/Tier-1 programmes, and repair-chain buyers in more than 60 countries. This guide is written for buyers evaluating a dual mass flywheel Hyundai manufacturer China sourcing route. It explains how to qualify a factory, what technical specifications to request, how to plan MOQ and lead time, which validation documents matter, and what commercial controls reduce risk before the first purchase order. It also gives practical ranges for tolerances, inspection records, sample timing, MOQ bands, packaging checks, and change-control points a buyer can place directly into an RFQ.
Driventus is an independent aftermarket manufacturer. Hyundai and other brand names are referenced only to identify vehicle fitment and are not used to imply endorsement, approval, or affiliation.
Decision framework: How to identify the right DMF before you quote
Hyundai-fitment dual mass flywheels are used across diesel and petrol platforms with manual transmissions. The same vehicle model name can hide important differences by engine code, transmission code, clutch diameter, starter position, pilot bearing arrangement, crankshaft flange, and market specification. For that reason, buyers should begin with controlled part identification rather than a price comparison spreadsheet.
For each enquiry, provide as much of the following data as possible:
Vehicle application range by market, engine, year, and transmission; include engine codes and gearbox codes rather than only model names.
OE part-number cross-reference if your business already uses that convention, such as references beginning with 23200 or 23260.
Clutch kit reference, pressure plate type, and friction plate diameter, commonly 215 mm, 225 mm, 228 mm, 240 mm or 250 mm depending on platform.
Crankshaft bolt quantity, thread size, pitch circle diameter, bolt-head seating type, and centre bore.
Ring gear tooth count, width, runout requirement, axial offset from crank mounting face, and chamfer orientation.
Overall flywheel diameter, stack height, friction-face height, and mounting-face position if known.
Annual volume forecast, first order quantity, shipment destination, and preferred Incoterms.
A capable supplier should confirm fitment using drawings, physical samples, verified catalogue data, or an agreed master sample before issuing a production quotation. This matters because several DMFs can appear visually similar while differing in bolt seating, clutch height, or starter engagement position. In a practical RFQ, ask the factory to return a signed fitment sheet showing at least clutch diameter, bolt pattern, tooth count, overall height, crank bore, and ring-gear position; this prevents verbal assumptions becoming production errors.
For distributors, careful identification reduces catalogue returns and customer disputes. For repair-chain buyers, it reduces technician downtime and avoids the cost of removing an incorrectly matched assembly after installation has begun. A wrong DMF may install far enough to consume labour time, yet create starter noise, clutch drag, abnormal idle rattle, or gearbox input-shaft misalignment after the job is nearly complete.
Driventus can review dual mass flywheel requirements alongside related engine and powertrain items in our catalog, including adjacent component programmes where consolidated shipment or mixed-container planning is useful.
Failure modes: What goes wrong when a factory lacks process control
A dual mass flywheel combines machined steel masses, spring and damping assemblies, friction-control elements, bearings or bushings, grease systems, fasteners, and a starter ring gear. The supplier must control more than turning accuracy. Spring-rate selection, angular free-play, axial movement, assembly security, balance, thermal stability, and grease retention all influence service life and drivability.
For a China-based manufacturer, procurement teams should assess whether the facility has in-house capability or tightly controlled partner processes for:
CNC turning, drilling, milling, and finishing of primary and secondary masses, with datum control from the crank mounting face to clutch friction face.
Controlled heat treatment and hardness verification where specified, commonly checked by HRC or HB readings on defined features.
Ring gear processing, induction heating or press fitting, tooth inspection, and runout control.
Damper spring selection, spring-stage assembly, and component lot control, including spring load verification at specified compression points.
Grease filling by weight, metered dispensing, or another documented method, with typical control by target weight and upper/lower tolerance.
Riveting, staking, or bolted assembly with torque, angle, or force monitoring; critical fasteners should have recorded settings.
Friction face machining and surface-finish control, normally requiring consistent lay direction and Ra values suitable for clutch bedding.
Dynamic balancing with recorded measurement and correction values, not only visual grinding marks.
End-of-line checks for rotational free angle, axial play, radial play, abnormal noise, marking, and visual defects.
A factory audit should not rely on finished-product appearance alone. Ask to see process flow charts, control plans, failure mode and effects analysis records, inspection instructions, gauge calibration files, nonconforming-material procedures, corrective action examples, and batch traceability from incoming material to packed carton. A real DMF line should be able to show how one carton label connects to assembly date, material heat, damper spring lot, grease lot, machining batch, balance record, and final inspector.
It is also worth clarifying which operations are performed inside the factory and which are outsourced. Subcontracting is not automatically a problem, but critical processes such as heat treatment, ring gear processing, spring supply, coating, or balancing need defined specifications, incoming checks, and change controls. If ring gears are purchased externally, the supplier should inspect tooth count, tooth profile, hardness, bore size, chamfer, and batch marking before release to assembly.
Driventus operates under IATF 16949:2016 and ISO 9001:2015 management systems, with procurement, production, inspection, traceability, and corrective action procedures linked through the quality system.
Comparison: MOQ and lead time across SKU types
MOQ and lead time depend on the application, tooling status, component availability, packaging design, documentation level, and whether the buyer needs PPAP-style submission elements. The table below gives practical planning ranges for distributors, importers, and programme buyers. Final terms should always be confirmed against the drawing, sample status, and forecast volume.
Sourcing item
Typical range or requirement
Buyer note
Existing Hyundai-fitment reference
100–300 pieces per SKU
Lower quantities may be possible when combined with other SKUs in a mixed shipment; target at least 1–2 pallets per heavy SKU for freight efficiency
New development SKU
300–800 pieces initial batch
Depends on tooling, fixtures, component sourcing, damper validation, and whether a master sample is available
Sample lead time
20–45 days
Add 10–20 days if new gauges, ring gear tooling, damper specification, or endurance testing is required
Mass production lead time
45–75 days after approval
Steel, spring, bearing, grease, packaging artwork, peak-season capacity, and export paperwork can affect timing
Export packaging
Neutral carton, pallet, buyer brand, or workshop pack
Packaging must protect ring gear teeth, friction faces, bolt holes, and machined surfaces; specify carton burst strength and pallet height limit if needed
Documentation
Inspection report, material record, traceability label
PPAP elements can be discussed for programme or high-volume supply; define documents before quotation
Payment and shipping
By agreed Incoterms
Confirm FOB, CIF, DAP, or buyer-forwarder procedures before production release; heavy DMFs can change landed cost sharply by pallet density
</tr></thead><tbody> </tbody></table>A disciplined project normally moves through these stages:
1. Application and part-number review. 2. Drawing, sample, or verified catalogue confirmation. 3. Quotation with MOQ, lead time, packaging, tooling, and documentation scope. 4. Sample production or sample selection from an existing approved SKU. 5. Buyer inspection, fitment check, bench measurement, and functional validation. 6. Specification freeze and production purchase order. 7. Incoming material preparation, machining, assembly, balancing, EOL inspection, and packing. 8. Pre-shipment inspection, packing confirmation, export documents, and loading photos. 9. Post-delivery feedback and corrective action process if needed.
MOQ logic should be transparent. For an existing SKU, the minimum is usually driven by setup time, balance-machine changeover, packaging print quantity, and palletisation. For a new SKU, the minimum is driven by fixtures, CNC programmes, ring gear tooling, damper spring purchase quantities, sample validation, and the risk of unused dedicated components. A buyer requesting 50 pieces of a new DMF may see a high unit cost because tooling and validation must be amortised over too few units; 300–800 pieces normally gives a more realistic production price.
For repeat export programmes, the most stable approach is to approve samples, freeze the specification, then work with rolling forecasts. A 3-month firm order plus 6-month forecast helps the factory plan raw materials and damper components without forcing the buyer to hold excessive inventory. If a distributor sources clutch kits, release bearings, flywheels, and related engine parts together, combined planning can also reduce partial-shipment risk and freight inefficiency.
For applications requiring dimensional changes, damper tuning, packaging redesign, or private-label supply, Driventus can discuss custom manufacturing after a technical feasibility review.
Spec deep-dive: The critical dimensions every buyer must request
A dual mass flywheel quotation should include more than vehicle model names and a unit price. The buyer and supplier should agree on the controlled characteristics that will be measured during production and checked before shipment. Where no drawing exists, create a specification sheet from a master sample and record both nominal dimensions and acceptable limits.
Recommended specification checklist
Overall outside diameter and tolerance; for machined locating features, buyers often request ±0.05–0.10 mm depending on function.
Friction face diameter, surface finish, and usable contact area; typical clutch faces require controlled Ra, no chatter marks, no blueing, and no handling dents.
Crankshaft centre bore diameter and tolerance, with go/no-go gauge control for locating fit.
Bolt hole count, diameter, thread clearance, pitch circle diameter, countersink, chamfer, recess depth, and bolt-head seating detail.
Mounting face flatness, parallelism, and stack height; critical height dimensions should normally be controlled within tenths of a millimetre, not only visually checked.
Ring gear tooth count, module or pitch, width, radial runout, axial position, tooth hardness, and chamfer direction.
Pilot bearing or bushing arrangement where applicable, including bore, depth, press fit, and lubrication state.
Total weight and permissible batch variation; large deviations can indicate wrong mass, machining allowance, or component substitution.
Primary-to-secondary mass rotational free angle, including the measurement torque or fixture method.
Axial and radial play limits, measured at a defined point and load.
Static or dynamic balance requirement and correction method; specify whether every unit or sampled units are balanced.
Spring stage arrangement, damping concept, grease specification, and grease fill quantity control.
Surface treatment, rust prevention, and corrosion protection for storage and sea freight.
Marking method, batch code format, carton label fields, and traceability requirements.
Hyundai-fitment applications may look similar across engine families but differ in starter engagement, clutch stack height, crank flange geometry, or bolt seating depth. A small mismatch in ring gear position or mounting-face height can create starter noise, clutch release problems, vibration, or complete installation failure. A useful drawing pack should identify datum A as the crank mounting face, then define ring gear offset, clutch face height, centre bore, and bolt PCD from that datum so both buyer and factory measure the same way.
Where the buyer has an existing sample, reverse engineering should be supported by controlled measurement reports and agreed acceptance tolerances. A sample report should include at least 20–30 key dimensions, photos of datum setup, measuring equipment ID, inspector, date, and revision status. Where the buyer has an OE reference, it should be used for fitment identification only. It must not be represented as vehicle manufacturer approval.
Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment only.
Step-by-step: From sample approval to container loading
Dual mass flywheel validation should reflect real operating risks: torsional fatigue, clutch heat, start-stop cycling, gear rattle control, balance stability, grease retention, and assembly integrity. Procurement teams should distinguish between routine end-of-line checks, batch inspections, and design validation or periodic laboratory tests.
Useful validation and inspection items include:
Dimensional inspection using calibrated gauges, CMM, height gauge, dial indicator, surface tester, or dedicated fixtures.
Material composition checks for key steel components, with heat number or supplier certificate linkage.
Hardness testing where heat-treated features are specified, such as ring gear teeth or wear features.
Friction face runout, flatness, and surface-finish verification.
Ring gear tooth profile, tooth count, chamfer direction, radial runout, and axial position inspection.
Rotational free-play and spring-stage verification with a defined torque or fixture procedure.
Axial play and radial play inspection with a defined load and measuring point.
Dynamic balance testing with recorded initial unbalance, correction position, final value, operator, and machine ID.
Grease weight or dispensing verification, ideally by recorded shot weight or before/after assembly weight control.
Rivet, bolt, staking, or fastening strength control using torque, force, pull, or destructive audit checks where applicable.
Abnormal-noise check after assembly, including manual rotation and, where available, fixture-based noise screening.
Salt spray or corrosion-resistance testing where required by the buyer.
Functional endurance testing for new, modified, or high-volume SKUs.
For first approval, buyers should ask for a sample inspection report covering all agreed critical dimensions, plus photos of the part, packaging, marking, and carton label. For mass production, a practical batch report can include sampling quantity, measured values for key dimensions, free-play results, axial/radial play, runout, balance status, appearance, packing quantity, and inspector sign-off. For high-volume or programme supply, request a control plan, process flow, PFMEA, material certificates, gauge list, capability data for selected dimensions, and change-notification procedure.
For automotive production and service parts, quality management should align with IATF 16949:2016 and ISO 9001:2015. If the buyer sells into the European Union or the United Kingdom, substance compliance should also be discussed, including REACH (EC) No 1907/2006 and any restricted-substance declarations requested by importers. Depending on the destination market, packaging materials may require separate compliance evidence, recycling marks, or importer-specific labelling.
Management-system standards do not replace application testing. They create a framework for consistent production, traceability, corrective action, and document control. Buyers should still approve samples under the intended clutch, gearbox, and vehicle conditions before releasing large-scale orders.
Q&A: Audit questions that separate capable factories from traders
A structured audit is useful before approving a new supplier, shifting volume from a trading company to a factory-direct model, or adding a new dual mass flywheel programme. The goal is to confirm real manufacturing control, not just export communication.
Process and traceability
Can the supplier show the process flow from incoming steel or semi-finished components to final packed product?
Are batches traceable by material heat number, component lot, assembly date, production line, balance record, packaging lot, and inspector?
How are critical characteristics identified in the control plan and work instructions?
What is the quarantine process for nonconforming material, and who has authority to release or scrap it?
How are engineering changes reviewed, approved, recorded, and communicated to customers?
Are supplier lots for springs, grease, bearings, bushings, fasteners, and ring gears recorded?
Can the factory demonstrate one finished carton back to its machining batch and purchased-component lots within 30 minutes?
Measurement and testing
Which gauges are used for crank bore, bolt pattern, ring gear runout, mounting-face flatness, stack height, and friction-face finish?
Are gauges calibrated to a documented schedule with traceable records and status labels?
Is dynamic balance measured on every unit or by batch sampling, and what final residual unbalance limit is used?
What are the acceptance criteria for angular free-play, axial play, radial play, runout, and noise?
Are inspection results recorded by batch and retained for a defined period, such as 3–5 years for programme parts?
How does the factory investigate repeat failures or field claims, and can it show 8D or corrective action examples?
Commercial and logistics control
Does the supplier own the production equipment, or are critical processes subcontracted?
What is the normal monthly capacity for the target SKU family, and how much is already committed?
Which components or processes have the longest lead time: steel blank, ring gear, spring set, bearing, grease, coating, or carton printing?
How are private-label cartons approved, stored, and controlled against artwork errors or mixed labels?
Can the supplier support mixed-SKU palletisation for distributor orders, with SKU separation and scannable labels?
Are pre-shipment photos, carton labels, pallet labels, packing lists, and container-loading records checked before loading?
For importers, the audit should also review export-document accuracy: HS code review, carton dimensions, gross and net weight, country-of-origin marking, packing list format, invoice consistency, and shipment photo records. Incorrect logistics data can cause avoidable customs delays, storage costs, or customer receiving disputes. Because DMFs are heavy, even small carton-weight errors multiplied across 300–800 pieces can create freight quotation disputes or warehouse receiving discrepancies.
Scenario: How to compare landed cost when two quotes differ by USD 3
The lowest unit price is not always the lowest landed cost. Dual mass flywheels are heavy precision assemblies, so scrap, catalogue errors, installation claims, repacking work, emergency air freight, and warranty recovery can quickly exceed the difference between two quotations. A USD 2–5 saving per unit can disappear quickly if one pallet is mislabelled, one ring gear batch has incorrect offset, or one container needs local rework.
Main cost drivers include:
Steel grade, forging or casting route, blank weight, machining allowance, and CNC cycle time.
Damper spring complexity, number of stages, spring load requirements, and spring sourcing MOQ.
Bearing, bushing, grease, friction-control, rivet, washer, and fastening materials.
Heat treatment, coating, phosphating, oiling, VCI protection, and corrosion-resistance requirements.
Balance grade, inspection frequency, correction time, and record-keeping level.
Tooling, fixtures, gauges, CNC programmes, inspection jigs, and new SKU development work.
Order quantity per SKU, forecast stability, and whether production can be batched with related references.
Packaging strength, carton printing, foam or cardboard inserts, rust prevention, pallet specification, and drop-test requirements.
Documentation level, including PPAP-style evidence, capability studies, lab tests, and buyer-specific forms.
Freight mode, pallet density, destination charges, mixed-SKU handling, and local warehouse repacking.
Risk controls should be agreed before the first purchase order. Define the approved drawing or master sample, inspection standard, AQL or sampling rule, claim evidence process, replacement or credit mechanism, and change-notification rule. If spring source, grease specification, machining datum, coating, bearing type, ring gear process, balance correction method, or packaging design forms part of the approved specification, the supplier should not change it without buyer approval.
Price analysis should compare like for like. Ask whether the quotation includes sample cost, tooling cost, private-label carton cost, palletisation, inspection report, export carton, VCI bag or rust preventive, spare labels, and destination-document support. For heavy assemblies, FOB unit price alone is incomplete; calculate landed cost per saleable unit after ocean freight, duties, local handling, warranty reserve, and expected defect/repack rate.
For distributors supplying multiple markets, labelling needs the same discipline as machining. A single SKU may require different language labels, importer addresses, barcode formats, safety notices, or compliance statements for the EU, UK, United States, Canada, Australia, Brazil, or other destination markets. Clear label control reduces receiving errors and protects the buyer’s brand in wholesale channels.
How Driventus supports B2B buyers
Driventus supplies engine and powertrain components from Taizhou, Zhejiang, with export experience across more than 60 countries. For dual mass flywheel projects, our role is to help buyers move from uncertain fitment and fragmented sourcing to controlled specifications, repeatable production, and export-ready documentation.
Support can include:
Application review using buyer data, samples, drawings, or OE reference conventions.
Existing SKU quotation where tooling and validation history are available.
New product development after technical feasibility review, including feasibility on dimensions, damper package, ring gear, and packaging.
Specification confirmation, sample coordination, measurement report preparation, and inspection planning.
Neutral packaging or buyer-brand packaging for wholesale distribution, with label and carton approval before mass printing.
Mixed-container planning with other engine and powertrain items to improve pallet utilisation and reduce partial shipments.
Corrective action response for verified field issues, including evidence review, batch trace, root-cause analysis, and containment.
Communication with distributor, importer, and repair-chain purchasing teams.
A buyer looking for a dual mass flywheel Hyundai manufacturer China supply route should evaluate technical capability and communication discipline as carefully as unit price. The strongest projects usually begin with a complete data pack, sample confirmation, realistic forecast, agreed acceptance criteria, and a clear plan for packaging and documentation. A practical first RFQ should include target SKU list, expected annual volume, first order plan, destination port, Incoterms, packaging style, sample availability, required documents, and any known critical dimensions.
To start a sourcing review, send the application list, annual forecast, destination market, packaging requirement, and any available sample or drawing through request a quote.
Frequently asked questions
Yes. Private-label packaging can be discussed for qualified B2B orders. The final arrangement depends on SKU availability, order quantity, carton design, artwork approval, destination-market requirements, and label content. Fitment references are used only to identify application coverage.
Provide the vehicle application, engine and transmission details, OE reference if your business already uses one, clutch diameter, ring gear details if known, order forecast, packaging requirement, and destination port or address. A physical sample or drawing improves quotation accuracy for less common applications.
Driventus can provide batch inspection records, traceability information, and agreed compliance documents. For programme supply, additional documents such as PPAP-style elements can be reviewed during the approval stage. Our management systems follow IATF 16949:2016 and ISO 9001:2015.
No. Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment only. We do not claim approval, endorsement, or affiliation with any vehicle manufacturer. Buyers should validate samples for their intended application and market.
If you are comparing factory-direct supply for Hyundai-fitment dual mass flywheels, share your application list, sample status, destination market and forecast for a technical review. Contact Driventus here: /contact.html
