RoHS requirements are best known in electrical and electronic equipment, yet procurement teams increasingly use restricted-substance controls for mechanical engine components as well. For crankshafts, the practical goal is to verify that the shaft material, surface treatments, pressed plugs, balance weights, anti-rust oils, marking materials, packaging contact materials, and any supplied accessories do not introduce controlled substances into the customer’s supply chain. A defined plan for rohs testing for crankshaft programmes helps reduce customs risk, supports compliance files, and prevents late rejection during incoming inspection or customer onboarding. This guide explains how to specify RoHS checks for crankshaft sourcing without confusing them with metallurgical validation, dimensional inspection, or durability testing. It is written for sourcing engineers, category buyers, supplier quality teams, and import managers who need repeatable evidence from factories and third-party laboratories. Driventus is an independent aftermarket manufacturer; brand names are referenced for fitment only.
Where RoHS Fits in a Crankshaft Qualification Plan
RoHS is a restricted-substance control, not a performance standard for rotating engine parts. In the EU, the main legal references are Directive 2011/65/EU and Commission Delegated Directive (EU) 2015/863, which added four phthalates to the restricted list. Buyers may also request evidence aligned with REACH (EC) No 1907/2006, especially where coatings, rust preventives, polymer plugs, marking materials, or packaging materials are part of the supplied article.
For a crankshaft, RoHS evidence should sit beside the mechanical validation package rather than replace it. A complete sourcing file may include:
Material certificate for the forged steel or cast iron heat lot
Chemical composition test by optical emission spectroscopy or an equivalent method
Hardness and microstructure records after heat treatment
Dimensional inspection report for journals, fillets, oil holes, flange, and keyway
Magnetic particle or ultrasonic inspection where specified
Dynamic balance report where required by the application
Salt spray or coating validation where corrosion protection is specified
RoHS and, where requested, REACH declaration or laboratory report
For buyers reviewing crankshaft families in our catalog, the key is to separate compliance evidence from fitment evidence. A part may meet the drawing, match the vehicle application, and still need restricted-substance documentation before it can be approved for a customer programme.
Step-by-Step Procedure for RoHS Testing for Crankshaft Orders
A practical procedure should be documented before production approval. The sequence below is suitable for new suppliers, new coatings, customer onboarding, and annual compliance surveillance.
Step
Action
Evidence to keep
1
Define the bill of materials, including shaft material, plugs, balance weights, surface coating, marking ink, rust inhibitor, and packaging contact items
Controlled BOM and material list
2
Identify homogeneous materials that can be tested or declared separately
Sampling map with photos
3
Confirm applicable restricted substances under RoHS Directive 2011/65/EU and (EU) 2015/863
Compliance requirement sheet
4
Choose screening, supplier declaration, or full laboratory testing based on risk
Test plan and quotation
5
Take samples from production-representative parts, not prototype-only material
Sample log, batch number, heat number
6
Review laboratory results against customer limits, units, and reporting thresholds
Signed report and internal review
7
Link the result to part number, revision, supplier, and production lot
Compliance file and retention record
</tr></thead><tbody> </tbody></table>For low-risk metallic base material, XRF screening can be used as an initial check for elements such as lead, mercury, cadmium, and chromium. It is fast and useful for supplier surveillance, but it is not a complete answer for every material. For coatings, polymers, elastomer plugs, inks, labels, adhesives, or oils, buyers should confirm whether wet-chemical or other laboratory methods are needed because XRF cannot reliably identify all restricted organic substances, including the phthalates added by (EU) 2015/863.
Repeat testing when the compliance scope changes. Typical triggers include a new plating supplier, revised coating chemistry, a different anti-rust oil, a change from forged steel to cast material, a new plug or balance-weight source, or a packaging change requested by logistics.
What to Verify in the Laboratory Report
A test report is useful only when it is traceable, technically specific, and tied to the supplied article. Procurement teams should not accept a one-line statement that a crankshaft is compliant without sample details and test scope.
Check that the report includes the following items:
Supplier name and manufacturing location
Part description, part number, and revision level
Sample photographs or clear sample identification
Batch number, heat number, or production date
Test method used by the laboratory
Individual results for each tested homogeneous material
Reporting units and detection limits
Pass/fail judgement against the specified directive or customer requirement
Laboratory accreditation reference, where available
Date of issue and authorised signature
The most common weakness is poor sample definition. A crankshaft supply package may contain several material types: base metal, pressed plug, balance weight, coating layer, ink mark, protective oil residue, label, and packaging contact film. If the report covers only a machined steel coupon, it may not represent the crankshaft as delivered.
Buyers should also avoid over-reading RoHS data. A compliant report does not confirm fatigue strength, journal wear performance, bearing compatibility, oil-hole cleanliness, or dimensional capability. Those characteristics need separate validation under the drawing, control plan, and quality agreement. Driventus manages these records through its quality system, aligned with IATF 16949:2016 and ISO 9001:2015.
Sampling Rules for Production Lots and Supplier Audits
RoHS testing for crankshaft programmes should be risk-based. Testing every shipment is rarely practical for metal components, but relying only on an initial declaration can create gaps when sub-suppliers, coatings, rust preventives, or packaging materials change.
A typical sampling approach is:
New part introduction: test production-representative samples before PPAP, first shipment, or customer approval.
Annual surveillance: retest critical material groups at least once per year where customer contracts require it.
Change control: retest after changes to material source, coating chemistry, cleaning process, rust preventive, marking ink, plug material, balance weight, or packaging contact material.
Incoming concern: retest if customs, customer inspection, supplier audit, or internal review identifies an undocumented material.
High-risk materials: prioritise polymer, coating, adhesive, ink, oil, and surface-treatment inputs over bulk steel unless the steel source is unknown.
During a factory audit, ask the supplier to show how restricted-substance control is built into purchasing, production, and document retention. Useful audit questions include:
1. Are approved sub-suppliers listed for coatings, plugs, oils, balance weights, labels, and packaging? 2. Are material certificates linked to heat numbers and production batches? 3. Is there a written change-control process for chemical inputs and surface treatments? 4. Are non-conforming compliance documents quarantined like dimensional non-conformities? 5. Are reports retained for the period required by the customer, contract, or regulation?
For custom manufacturing, define the compliance package at RFQ stage. This avoids later disagreement about whether testing covers only the crankshaft body or the complete supplied article, including accessories and packaging contact materials.
How RoHS Differs from REACH, IMDS, and Mechanical Validation
Restricted-substance and material-data requests often arrive together, but they are not the same. Clear terminology prevents duplicated testing, missing declarations, and incorrect assumptions about what a report proves.
Requirement
Main purpose
Typical relevance to crankshafts
RoHS Directive 2011/65/EU and (EU) 2015/863
Restricts specified substances in electrical and electronic equipment
Often requested by customers as a supply-chain control, especially for mixed assemblies or corporate compliance files
REACH (EC) No 1907/2006
Controls chemical substances and substances of very high concern in articles and supply chains
Relevant to coatings, oils, polymers, packaging, and declarations for articles supplied into the EU
IMDS
Automotive material data reporting system used by OEM and Tier-1 supply chains
Relevant when customers require full material breakdown for automotive programmes
IATF 16949:2016
Automotive quality management system requirements
Relevant to process control, traceability, corrective action, and supplier management
ISO 9001:2015
Quality management system requirements
Relevant to documented processes, control of external providers, and continual improvement
</tr></thead><tbody> </tbody></table>Mechanical validation remains separate. A crankshaft drawing may specify journal diameter tolerance, runout, fillet radius, surface roughness, induction-hardening depth, nitriding case depth, oil-hole geometry, and balance limits. None of those performance or process-control data are proven by a restricted-substance report.
For aftermarket fitment, procurement teams may also manage OE cross-reference files such as OE 06A… or OE 11251… conventions where relevant to the programme. These references support identification and fitment matching only; they are not evidence of vehicle manufacturer approval or restricted-substance compliance.
Buyer Checklist Before Releasing a Purchase Order
Before placing a crankshaft order, buyers should convert compliance expectations into purchase-order language. This is especially important when selling through distributor networks into the EU, UK, North America, Australia, Brazil, or other markets where customer compliance files are reviewed before shipment or resale.
Use this checklist before release:
Confirm whether the customer contract requires RoHS, REACH, IMDS, or a combination.
Define whether the test covers the bare crankshaft or the complete supplied article with plugs, coatings, oils, labels, and packaging contact materials.
Require reports to identify part number, revision, batch, sample material, and test method.
State whether third-party laboratory testing is required or whether a supplier declaration is acceptable for low-risk materials.
Include change-control obligations for material source, coating process, oil, ink, plug material, balance weight, and packaging.
Match the compliance file to the same part revision used for dimensional inspection and quality approval.
Store the report in the supplier quality record, not only in the purchasing email chain.
Review expiration or retest frequency under customer-specific requirements.
At Driventus, crankshaft programmes can be supplied with drawing-based inspection, material traceability, and restricted-substance documentation when specified in the RFQ. Early definition matters because laboratory lead time, sample preparation, and report review can affect production release and shipment planning. For export customers, the most efficient route is to include compliance needs, target market, annual volume, drawing or sample status, and requested documentation when you request a quote.
Frequently asked questions
Not always. RoHS is mainly tied to electrical and electronic equipment, but many automotive customers request it as part of restricted-substance control. The requirement depends on the sales market, customer contract, and whether the crankshaft is part of a wider assembly.
XRF is useful for rapid screening of certain elements in metals and coatings, but it cannot confirm all restricted organic substances. Polymer parts, inks, oils, adhesives, and some coatings may need laboratory chemical methods. The test plan should be matched to each homogeneous material.
Repeat testing is normally risk-based. Common triggers include new part launch, annual customer surveillance, material supplier change, new coating chemistry, new rust preventive, packaging change, new plug or balance-weight source, or any compliance concern found during audit or incoming inspection.
If you need crankshafts with traceable inspection records and defined restricted-substance documentation, send your drawing, sample details, target market, and annual demand. Our team can review the compliance scope and respond through /contact.html
