Home/ Blog / dual mass flywheel

dual mass flywheel · 2026-07-06

Dual Mass Flywheel Audi Manufacturer China Sourcing Guide

Sourcing a dual mass flywheel for Audi-fitment applications is more complex than buying a conventional machined flywheel. A dual mass flywheel uses primary and secondary rotating masses, arc springs, friction control elements, high-temperature grease, rivets, bearings or bushings, and a precisely positioned starter ring gear to reduce torsional vibration before torque reaches the gearbox. For importers, distributors, and program buyers, the supplier must control metallurgy, CNC machining accuracy, heat-treatment stability, torsional damping behavior, concentricity, dynamic balance, traceability, and export packaging across repeat production lots.

This guide is written for procurement teams evaluating a dual mass flywheel Audi manufacturer China option for aftermarket distribution, private label supply, repair-chain programs, or Tier-1 support. It covers the technical data to collect, factory audit priorities, validation testing, MOQ and lead-time planning, documentation, logistics, and commercial risk controls. Practical buying decisions should be based on drawing revision, measurement evidence, torque-angle behavior, sample approval, lot traceability, and agreed claim rules—not on a catalog cross-reference alone.

Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment identification only. We do not claim approval, sponsorship, or endorsement by any vehicle manufacturer. Buyers should validate each application against OE data, sample measurements, vehicle fitment records, and market-specific compliance requirements before placing production orders.

Decision Framework: What to Verify Before Price Talks

A dual mass flywheel is a durability-critical driveline component. It connects the crankshaft to the clutch assembly and helps isolate torsional vibration generated by combustion pulses, especially at idle, low engine speeds, launch, and tip-in/tip-out driving. In Audi-fitment applications, the part must match the engine torque curve, gearbox input characteristics, starter ring gear position, clutch interface, crankshaft bolt pattern, bolt-head clearance, pilot support, and installation envelope.

Before discussing price, procurement teams should confirm whether the supplier can provide application-specific engineering data. A low quoted unit cost has limited value if the damping curve, free angle, balance grade, friction face position, or installed height is inconsistent. A 0.5–1.0 mm error in offset or pilot location can create clutch release complaints; excessive runout can feel like clutch judder; poor balance can be misdiagnosed as gearbox or engine-mount vibration.

Key sourcing questions include:

Which engine and transmission families are covered, and are engine code and gearbox code both recorded?
Are parts produced from controlled drawings, approved customer samples, or reverse-engineered references?
Can the supplier provide a first article inspection report with actual dimensions rather than pass/fail only?
What dynamic balancing method is used, and what residual unbalance or balance grade is accepted?
Are grease type, spring rate, spring preload, rivet retention, bearing specification, bushing material, and friction washer material controlled by BOM revision?
How are axial play, radial play, free angle, working damping angle, and torque-angle hysteresis checked during production?
Are critical dimensions checked with gauges, CMM, height gauge, dial indicator, or dedicated fixtures, and what is the gauge calibration interval?
Can the factory support private label cartons, barcode labels, pallet labels, country-of-origin marking, and batch-level packing lists?
What warranty analysis process is used for returned or disputed parts, and what data is required from the installer?

For buyers comparing a dual mass flywheel Audi manufacturer China shortlist, the practical starting point is process capability rather than catalog count. The supplier should be able to show how the same flywheel is manufactured, inspected, packed, and traced lot after lot. Ask for recent inspection sheets from serial production, not only a polished sample report created for sales.

Driventus supports B2B buyers with application review, sample matching, and production feasibility checks. Related drivetrain and engine part families can be reviewed through our catalog.

Cross-Reference Pitfalls: Why Engine Codes Beat Catalog Numbers

Audi-fitment flywheels are often sourced by engine code, gearbox code, clutch diameter, and OE part-number cross-reference. A procurement file may include internal references such as OE 06A…, 03L…, 0B1…, or LuK/Sachs-style aftermarket interchange numbers depending on the buyer’s catalog system. These references are useful for identifying fitment, but they should not replace technical verification.

A responsible supplier should ask for at least one of the following data sets before confirming a production order:

OE reference used by the customer, if available
Vehicle platform, model year range, engine displacement, fuel type, power output, and engine code
Transmission code, clutch diameter, spline count, and release system type where known
Crankshaft bolt pattern, bolt quantity, bolt size, PCD, and bolt grade requirements where specified
Ring gear tooth count, ring gear outside diameter, and starter engagement position
Overall height, crank mounting face offset, clutch mounting face offset, pilot diameter, and friction face diameter
Clutch cover locating dowel positions, pressure plate bolt pattern, and friction surface step if applicable
Target torque capacity, operating duty profile, taxi/fleet use, towing use, or performance-remap exposure
Sample part, approved drawing, or customer measurement report for reverse measurement

For aftermarket distribution, the cross-reference table needs disciplined revision control. One flywheel may appear to cover several vehicle variants, but a small offset error can cause clutch release problems, starter noise, vibration, abnormal bearing load, or premature wear. Procurement teams should require a controlled interchange list with revision history, not an informal spreadsheet copied between sales teams.

Fitment data should also distinguish between confirmed applications, under-review applications, and applications rejected after measurement or field feedback. This prevents a catalog expansion from creating warranty exposure. When a new reference is added, buyers should record the evidence used for approval: OE sample, customer vehicle test, drawing comparison, approved interchange, installer feedback, or validated bench measurement.

For a new reference, a useful reverse-engineering checklist includes 100% measurement of mounting interfaces, confirmation of inertia and mass distribution where possible, ring gear tooth count verification, free-angle and torque-angle measurement of the reference sample, and comparison of clutch cover installation height. For worn OE samples, buyers should avoid copying damage, wear grooves, heat spots, or excessive rotational free play into a production drawing.

Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment only. Fitment references identify applications and do not imply vehicle manufacturer approval. For custom programs, buyers can send samples, drawings, or cross-reference files through our custom manufacturing team.

Spec Deep-Dive: Manufacturing Controls That Determine NVH and Life

A dual mass flywheel combines casting or forging, precision machining, heat treatment, spring assembly, lubrication, riveting or fastening, final balancing, and corrosion protection. Each stage affects NVH performance, clutch engagement, and service life. Procurement teams should audit both the component manufacturing route and the final assembly process, because many critical parts are hidden after assembly.

Typical controlled characteristics include:

</tr></thead><tbody> </tbody></table>A dual mass flywheel Audi manufacturer China program should define acceptance criteria for each control point. Typical buyer specifications may call for controlled runout in the 0.05–0.15 mm range, residual unbalance controlled by design mass and diameter, hardness confirmation after heat treatment, and torque-angle behavior compared with a golden sample or drawing curve. These figures must be finalized by part number because DMF geometry, mass, and damping architecture vary.

Real process detail matters. Incoming masses should be identified by casting/forging lot; rough machining should leave enough allowance for distortion after heat treatment; final machining should control friction face height and crank mounting datum in one fixture where feasible. Assembly should use controlled grease weight, spring set matching, verified washer orientation, controlled riveting or fastening force, and post-assembly functional rotation checks. Final balancing should be performed after full assembly, not before internal components are fitted.

When buyers provide only a sample and a target price, engineering risk moves into production. Better outcomes occur when the buyer and supplier agree on a controlled drawing, inspection plan, packing standard, and fitment table before tooling or batch production begins.

For recurring orders, Driventus recommends golden sample retention. One approved sample remains with the buyer and one remains at the factory. Future disputes can then be checked against a defined reference instead of memory, photographs, or inconsistent aftermarket catalog descriptions.

Factory Audit Checklist: What to Inspect Beyond the Certificate

A supplier certificate is not a substitute for process evidence, but it is a useful qualification screen. Driventus operates under IATF 16949:2016 and ISO 9001:2015 quality management principles for automotive production control, traceability, corrective action, and continual improvement. Buyers can review our quality system before requesting a supplier audit.

For export programs, procurement teams may also need documentation related to REACH (EC) No 1907/2006 for substances of concern, RoHS where contractually required for certain markets, and customer-specific packaging or labelling rules. A flywheel is not a brake friction product, so standards such as ECE R-90 or SAE J2527 are not the direct validation basis for this category. The same procurement discipline still applies: define the test method, acceptance limit, sample quantity, report format, and approval responsibility before production release.

Factory audit points should include:

Incoming steel, casting, spring, grease, bearing, bushing, washer, and rivet inspection records
Supplier approval records for spring steel, grease, friction washers, and ring gears
Heat treatment furnace control, time-temperature charts, hardness verification, and batch traceability
CNC machining capability, fixture maintenance, tool-life control, and gauge calibration status
Measurement system checks for key gauges, ideally including GR&R for critical fixtures where high volume is planned
Assembly fixtures for axial play, radial play, free angle, and damping angle control
Grease dispensing process, scale calibration, and error-proofing for fill quantity
Dynamic balancing equipment, calibration records, correction method, and operator training records
Traceability from finished part to material batch, heat-treatment batch, and assembly lot
Nonconforming product segregation, concession rules, and rework approval process
Corrective action reports for past customer complaints, including 8D or equivalent root-cause evidence
Packaging drop test or transit validation for export cartons and pallets
Storage controls for machined parts, rust prevention, first-in-first-out, and mixed-reference inventory

A remote audit can screen documentation, but a physical or third-party audit is more effective for verifying assembly discipline. Because dual mass flywheels contain internal components that are not visible after assembly, buyers should pay close attention to in-process records, operator work instructions, mistake-proofing, and batch-level inspection evidence.

During qualification, request one complete lot-history example: material certificate, machining inspection, heat-treatment record, assembly sheet, balance report, packing list, and shipping label for the same batch code. If a supplier cannot connect these documents, containment during a warranty issue will be slow and expensive.

Step-by-Step: MOQ, Lead-Time, and Commercial Planning

Commercial terms depend on the application, tooling status, forecast volume, validation scope, and packing complexity. A mature reference with existing tooling can move faster than a new cross-reference requiring reverse engineering, sample development, tooling adjustment, torque-angle validation, and fitment confirmation. Importers should separate sample lead-time from mass production lead-time in the sourcing schedule.

Typical planning ranges for B2B flywheel programs are shown below. Actual terms should be confirmed against part number, order mix, and market requirements.

Control point	Procurement relevance	Common verification method
Primary and secondary mass material	Affects strength, wear resistance, and inertia	Material certificate, hardness test, metallographic check
Friction surface flatness/runout	Affects clutch engagement and judder	Dial indicator, surface plate, or CMM inspection
Clutch face roughness	Affects bedding-in and friction stability	Ra test; commonly specified around Ra 1.6–3.2 µm depending on design
Axial play and radial play	Affects noise, stability, and service life	Fixture-based functional test; limit must be drawing-specific
Free angle and damping angle	Affects torsional vibration control	Rotational torque-angle test bench with recorded curve
Spring rate and preload	Affects launch feel and gearbox protection	Spring load test and assembly record
Grease specification and fill quantity	Affects damping stability and heat resistance	BOM control, weighing, supplier certificate, batch record
Rivet or fastener retention	Affects structural integrity	Pull test, torque check, staking inspection, or destructive lot audit
Ring gear position	Affects starter engagement	Dimensional inspection and go/no-go gauge check
Dynamic balance	Affects engine and gearbox vibration	Balancing machine report, residual unbalance record
Anti-corrosion coating	Affects storage and shipment stability	Salt spray or humidity exposure check when specified

</tr></thead><tbody> </tbody></table>Procurement teams should ask whether MOQ is calculated per part number, per shipment, or per mixed container. For heavy drivetrain components, pallet configuration, carton dimensions, and container weight limits can influence landed cost as much as the unit price. A unit price that is USD 1–2 lower may be offset by poor cube utilization, damaged cartons, or high destination handling cost.

Price logic should be transparent. Buyers should clarify whether the quote includes tooling, sample inspection, export carton, private label printing, palletizing, fumigation-free pallets, origin documents, and pre-shipment inspection. For new development, tooling fees may be charged once, amortized into the first production lots, or waived against a binding forecast. Put the condition in the purchase contract, including what happens if the program is cancelled after samples.

Payment terms, warranty terms, and after-sales analysis should be aligned before the purchase order is issued. A clear agreement should state what evidence is required for a claim: installation record, vehicle mileage, photos, returned sample, fault description, clutch kit used, batch code, and whether the vehicle was modified. This prevents vague debit notes and helps both sides identify root causes instead of treating every field complaint as a manufacturing defect.

Validation Testing: Building a PPAP-Style Evidence File

Dual mass flywheel validation should cover dimensions, function, durability, and shipping integrity. For OEM or Tier-1 support programs, buyers may request PPAP-style documentation even where a formal AIAG PPAP submission is not contractually required. For aftermarket distribution, a simplified approval package can still reduce risk and create a clear production baseline.

A practical approval file may include:

Part drawing with revision number and controlled critical characteristics
Bill of material summary for controlled components
Material certificates for primary masses, springs, rivets, ring gear, and friction washers
Heat treatment and hardness reports, with actual values and test locations
Full dimensional inspection report for first samples, including mounting datums and friction face height
Dynamic balance report with machine ID, correction location, and residual value
Functional torque-angle test result showing free angle, damping stages, and hysteresis behavior
Axial and radial play inspection result using a defined fixture and applied load
Surface roughness report for clutch contact face
Coating or corrosion resistance report when specified
Packaging specification, pallet pattern, and carton drop test result when requested
Control plan and inspection frequency for serial production
Traceability format showing batch code, production date, operator/line, and inspection status

The test plan should reflect the target market and risk level. A distributor selling into the EU and UK may prioritise REACH (EC) No 1907/2006 declarations, packaging waste requirements, and durable traceability labels. A North American importer may place more emphasis on warranty analysis workflow, warehouse barcode compatibility, and installer feedback. A Brazilian importer may require additional attention to documentation consistency, customs classification support, and packing durability for long logistics routes.

For higher-risk or new references, buyers can add endurance testing. This may include torsional cycling through defined torque and angle ranges, thermal exposure to represent clutch heat soak, rotational overspeed checks where applicable, and post-test measurement of free play, noise, grease leakage, rivet condition, and spring pocket wear. The exact cycle count and torque level should be based on engine output and duty profile, not copied from an unrelated application.

The core principle is the same in every market: validation must be connected to the application. A balance report alone does not prove correct damping performance, and a fitment listing alone does not prove durability. Buyers should require evidence that the part matches the intended engine, gearbox, clutch system, and duty profile.

Logistics and Labelling: Controlling Import Risk from Packing to Pallet

Dual mass flywheels are dense parts with machined surfaces, ring gears, and internal damping assemblies. Many references weigh roughly 10–18 kg per piece, so poor packaging can cause rust, dented teeth, carton rupture, friction face damage, or mixed-label errors. For B2B shipments, procurement teams should review packaging before mass dispatch, especially for private label or multi-reference orders.

Recommended export packing controls include:

VCI bag or equivalent anti-corrosion protection when required by route and storage time
Machined face protection using separator board, molded tray, foam, or capped contact areas
Ring gear edge protection inside the carton to prevent tooth damage and carton cutting
Individual carton with part number, batch code, quantity, gross weight, net weight, and country of origin
Master carton or pallet label matching the packing list and commercial invoice
Palletisation suitable for forklift handling and container loading, with corner protection and stretch wrap
Photo record before container sealing for mixed shipments
Barcode format agreed before artwork printing, such as EAN/UPC, Code 128, or customer warehouse code
Clear separation of references and production lots on the packing list
Moisture control for long ocean routes, including desiccant or container moisture management when specified

Importers should also define Incoterms clearly. FOB, CIF, DAP, and EXW quotations are not directly comparable unless inland freight, export declaration, insurance, port charges, customs clearance responsibilities, and destination charges are accounted for. Heavy parts can produce large cost differences from small changes in carton dimension, pallet height, or container loading plan.

A practical landed-cost review should compare unit price, gross weight, carton cube, pallet count, container loadability, duty rate, local handling, expected damage rate, and warranty reserve. For example, a stronger carton may add small packaging cost but reduce carton burst, repacking labor, and warehouse rejection. Conversely, overbuilt packaging can waste container space. Approve a packing specification by reference, not by a one-time photo.

Traceability is another risk control point. Each flywheel should be linked to a production lot so that warranty claims can be contained. If one distributor receives several production lots in the same shipment, the packing list should identify which pallets contain each lot. This makes stock rotation, field investigation, and corrective action faster if a problem is reported after sale.

Scenario: How Driventus Structures an Audi-Fitment Flywheel Program

Driventus manufactures engine and powertrain components in Taizhou, Zhejiang, with export experience across more than 60 countries. For dual mass flywheel sourcing, we support aftermarket distributors, wholesalers, OEM/Tier-1 purchasing teams, and multi-location repair chain supply programs.

Our support process normally follows these steps:

1. Buyer provides OE reference convention, vehicle application list, drawing, measurement report, or physical sample. 2. Engineering reviews dimensions, damping requirements, material route, ring gear position, and feasibility. 3. Commercial team confirms MOQ, lead-time, sample cost, tooling status, Incoterms, and packing assumptions. 4. Sample production or stock sample inspection is completed with dimensional and functional checks. 5. Buyer reviews dimensional, functional, balance, and packaging information. 6. Installation trial or bench comparison is completed where required by the program. 7. Golden sample, drawing revision, control plan, and packing specification are agreed for serial production. 8. Production lots are inspected, balanced, packed, labelled, and shipped according to the purchase order. 9. Warranty feedback is reviewed through batch traceability, returned-part analysis, and corrective action when required.

For buyers searching for a dual mass flywheel Audi manufacturer China supplier, the most useful enquiry includes more than a target price. Send annual forecast, market destination, private label requirements, OE cross-reference format, preferred MOQ, shipment frequency, test-document requirements, and any known failure concerns from your current supply. This allows the engineering and commercial review to be specific rather than generic.

A strong RFQ package should include target part numbers, estimated annual volume by reference, expected first-order quantity, required sample quantity, required documents, packaging artwork or label rules, destination port, Incoterm preference, and whether the part is for catalog stock, tender supply, fleet maintenance, or OE-service support. With that information, Driventus can assess whether the part is an existing reference, a minor modification, or a full new-development item.

Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment only. We can discuss catalog supply, sample matching, or request a quote for a defined sourcing program.

Frequently asked questions

Please provide the OE reference format if available, vehicle application list, engine and gearbox codes, clutch diameter, target annual volume, first-order quantity, destination market, Incoterm preference, packing requirements, and any sample or drawing data. Photos help, but dimensions or a physical sample are better for confirming fitment and production feasibility.

Yes. Private label cartons, barcode labels, and pallet labels can be discussed for B2B orders. Artwork approval, carton strength, country-of-origin marking, barcode format, pallet layout, and packing list format should be confirmed before mass production to avoid export and warehouse receiving problems.

No. Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment only. We do not claim approval, endorsement, or sponsorship by any vehicle manufacturer. Buyers should validate fitment and compliance for their own market.

Depending on the order and contract, documents may include dimensional reports, material certificates, hardness results, balance reports, torque-angle or functional inspection data, axial/radial play results, packing specification, and traceability records. IATF 16949:2016 and ISO 9001:2015 quality system documentation can be reviewed during supplier qualification.

If you are qualifying a dual mass flywheel Audi manufacturer China supply source, send your application list, forecast, sample or drawing data, MOQ target, packing rules, and documentation requirements for review. Contact Driventus to start a technical and commercial discussion at /contact.html

Request a Quote

Item	Typical planning range	Notes for buyers
Technical review	3–7 working days	Requires OE reference, sample data, drawing, or application list
Existing reference sample	10–25 working days	Subject to stock, finishing, and inspection queue
New development sample	35–75 working days	Depends on tooling, material, fixtures, and test requirements
Sample quantity	1–5 pcs per reference	Include one for installation trial and one retained as golden sample
MOQ for existing items	Often 50–200 pcs per reference	Can vary by weight, packing, and production schedule
MOQ for new development	Often 100–500 pcs or tooling-linked	Confirm amortisation, ownership, and exclusivity terms in writing
Mass production lead-time	45–90 days after approval	Affected by heat treatment, assembly, balancing, and export packing
Private label packing	Add 7–20 days when new artwork is used	Requires carton strength, label layout, barcode, and COO approval
Mixed-reference shipment	Case-by-case	Confirm whether MOQ applies per item, per PO, or per container