BIS Certification for Steel Wire for Spokes | IS 6902:1973 – Qualitance India
BIS Certification for Steel Wire for Spokes | IS 6902:1973
Steel wire for spokes is an important component in the manufacturing of bicycle wheels, motorcycle wheels and other spoke-based wheel assemblies. The quality of the wire directly affects the strength, durability, stability and performance of the finished wheel.
Steel spokes must possess suitable tensile strength, bending properties, dimensional accuracy and surface quality to withstand the stresses experienced during wheel operation.
To establish consistent quality requirements, the Bureau of Indian Standards (BIS) has prescribed IS 6902:1973 – Specification for Steel Wire for Spokes.
The standard covers requirements relating to chemical composition, tensile properties, bend performance, wire dimensions, tolerances, freedom from defects and zinc coating.
Steel Wire for Spokes is also included in the Ministry of Steel’s Steel and Steel Products Quality Control Order framework. However, the enforcement date has been deferred under a subsequent amendment, making it important for manufacturers to understand both the BIS certification framework and the current QCO position.
This article explains the product scope, regulatory status, technical requirements, testing parameters, sample requirements, grouping guidelines, documentation and BIS certification process under IS 6902:1973.
1. What is IS 6902:1973?
IS 6902:1973 is the Indian Standard titled:
Specification for Steel Wire for Spokes.
The standard establishes requirements for steel wire intended for the manufacture of spokes.
It covers both:
- Bare steel wire (bright drawn)
- Galvanized steel wire
The standard addresses the material and performance characteristics required for spoke manufacturing.
Typical applications include:
- Bicycle wheel spokes
- Motorcycle wheel spokes
- Wheelchair wheel spokes
- Other spoke-based wheel assemblies
- Certain wheeled equipment and engineering applications
The quality of spoke wire is important because spokes must withstand tensile loading, bending during assembly and repeated stresses during operation.
IS 6902:1973 provides requirements to support consistent product quality and performance.
Latest amendment: Amendment No. 3 to IS 6902:1973 was published and BIS issued implementation guidelines dated 9 February 2024. The amendment became applicable from 12 June 2024.
Manufacturers should therefore use the standard with its applicable amendments rather than relying only on the original 1973 text.
2. Is BIS Certification Mandatory for Steel Wire for Spokes?
Steel Wire for Spokes is included in the Ministry of Steel’s Steel and Steel Products (Quality Control) Order, 2024.
However, the implementation date applicable to this product was subsequently deferred.
| Particular | Details |
|---|---|
| Product | Steel Wire for Spokes |
| Indian Standard | IS 6902:1973 |
| QCO | Steel and Steel Products (Quality Control) Order, 2024 |
| Original notification | S.O. 3716(E), dated 29 August 2024 |
| Amendment | Steel and Steel Products (Quality Control) Amendment Order, 2025 |
| Amendment notification | S.O. 5134(E), dated 20 November 2025 |
| Deferred implementation date | 20 November 2028 |
| BIS certification framework | Scheme-I |
| Certification mark | ISI Standard Mark |
| Certifying authority | Bureau of Indian Standards |
What does the QCO deferral mean?
The 2025 amendment deferred enforcement of the relevant QCO entry for three years from the date of publication of the amendment.
Accordingly, as of October 2026, the deferred implementation date is 20 November 2028, subject to any subsequent government notification.
It is important to distinguish between two separate matters:
- BIS Scheme-I certification: IS 6902:1973 appears in the BIS Scheme-I product listing, and BIS has published a product manual for certification under this standard.
- Mandatory QCO enforcement: The QCO implementation date for the relevant entry has been deferred.
Therefore, manufacturers should not describe the QCO requirement as already enforceable in October 2026 merely because the standard appears in the BIS Scheme-I listing.
Before commencing manufacture or importation, businesses should check the latest QCO amendments and confirm the applicable certification position with BIS.
3. Product Scope under IS 6902:1973
IS 6902:1973 covers steel wire used for manufacturing spokes.
The BIS Product Manual PM/6902/1, May 2022, identifies two coating conditions within the scope of licensing:
| Product type | Description |
|---|---|
| Bare wire | Bright-drawn steel wire |
| Galvanized wire | Steel wire with galvanized coating |
The proposed BIS licence scope identifies:
- Product name: Steel Wire for Spokes
- Wire diameter range
- Coating condition: Bare or Galvanized
The manufacturer should identify the actual wire sizes and coating conditions manufactured at the factory.
The product scope should be consistent with the manufacturing and testing facilities available.
4. Technical Requirements under IS 6902:1973
The standard establishes requirements for steel wire to ensure its suitability for spoke manufacturing.
The principal technical characteristics include:
- Chemical composition
- Tensile strength
- Bend properties
- Wire diameter
- Dimensional tolerances
- Freedom from defects
- Zinc coating requirements, where applicable
4.1 Chemical Composition
Chemical composition is an important factor in determining the strength, ductility and mechanical behaviour of steel wire.
The standard specifies requirements for the chemical composition of the wire.
The principal chemical parameters include:
- Carbon
- Manganese
- Sulphur
- Phosphorus
The manufacturer should maintain suitable chemical analysis records and ensure traceability between the input material, cast or heat number and finished wire coils.
Under Amendment No. 3, chemical analysis may be carried out in accordance with IS 228 or another established instrumental or chemical method. The referee method is specified as IS 228.
4.2 Tensile Strength
Tensile strength is a key mechanical property for spoke wire.
The tensile test evaluates the resistance of the wire to tensile loading and helps establish whether the material meets the applicable requirements.
The test method reference was updated under Amendment No. 3 to:
IS 1608 (Part 1):2022 / ISO 6892-1:2019.
4.3 Bend Test
The bend test evaluates the ability of the wire to withstand bending without unacceptable cracking or failure.
This is important because spoke wire undergoes bending and forming operations during manufacturing and assembly.
Under Amendment No. 3, the test method reference was updated to:
IS 1716:2023 / ISO 7801:1984.
4.4 Wire Diameter and Tolerances
The standard specifies requirements for wire diameter and applicable dimensional tolerances.
Dimensional consistency is essential to ensure compatibility with spoke manufacturing processes and finished spoke specifications.
Manufacturers should maintain suitable measuring arrangements for:
- Wire diameter
- Variation in diameter
- Dimensional uniformity
- Applicable tolerances
4.5 Freedom from Defects
Steel wire should be free from defects that may affect its mechanical performance or suitability for spoke manufacturing.
The manufacturer should establish suitable visual inspection and quality-control procedures to identify unacceptable surface defects.
4.6 Zinc Coating Requirements
For galvanized wire, zinc coating is an important characteristic because it provides corrosion protection.
The standard includes coating-related requirements for applicable galvanized wire.
The BIS Product Manual identifies equipment and testing arrangements for:
- Determination of mass of zinc coating
- Uniformity of zinc coating
The relevant test references include:
- IS 6745 – Methods for determination of mass of zinc coating on zinc-coated iron and steel articles.
- IS 2633 – Method for testing uniformity of coating on zinc-coated articles.
The manufacturer should ensure that galvanized wire conforms to the applicable coating requirements.
5. Testing Requirements for BIS Certification
Product testing is an essential part of the BIS certification process.
The BIS Product Manual and BIS laboratory information identify the following principal testing parameters for IS 6902:1973.
| Test / Inspection | Purpose |
|---|---|
| Chemical analysis – Carbon | Verification of carbon content |
| Chemical analysis – Manganese | Verification of manganese content |
| Chemical analysis – Sulphur | Verification of sulphur content |
| Chemical analysis – Phosphorus | Verification of phosphorus content |
| Tensile test | Evaluation of tensile strength |
| Bend test | Assessment of bending performance |
| Wire diameter | Verification of wire size |
| Diameter tolerances | Verification of dimensional variation |
| Freedom from defects | Assessment of surface quality |
| Zinc coating mass | Verification of coating quantity, where applicable |
| Zinc coating uniformity | Assessment of coating uniformity, where applicable |
5.1 Chemical Analysis
Chemical analysis verifies whether the steel wire conforms to the prescribed chemical composition requirements.
The chemical parameters include carbon, manganese, sulphur and phosphorus.
The BIS product manual identifies instrumental and chemical testing arrangements for these parameters.
5.2 Tensile Test
The tensile test evaluates the mechanical strength of the wire under tensile loading.
The manufacturer should maintain suitable testing equipment or approved testing arrangements, as applicable.
5.3 Bend Test
The bend test assesses the ability of the wire to withstand bending under the prescribed conditions.
It helps evaluate the ductility and suitability of the material for spoke manufacturing.
5.4 Wire Diameter and Tolerance Inspection
Wire diameter and dimensional variation are important parameters for product consistency.
The BIS Product Manual identifies a micrometer and Vernier caliper among the major equipment required for dimensional inspection.
5.5 Zinc Coating Tests
For galvanized wire, coating tests establish the quantity and uniformity of zinc coating.
The BIS Product Manual identifies equipment and reagents for testing the mass and uniformity of the zinc coating.
Important: Exact numerical limits, sample preparation details and acceptance criteria must be verified from the current consolidated IS 6902:1973, including Amendment No. 3.
6. BIS Product Manual for IS 6902:1973
BIS published Product Manual PM/6902/1 in May 2022 for Steel Wire for Spokes.
The manual provides guidance for:
- Product scope
- Sample size
- Grouping guidelines
- Testing equipment
- Scheme of Inspection and Testing
- Scope of licence
- Production control
- Marking and test certificates
The manual is an important reference for prospective applicants and existing licensees.
6.1 Sample Size
The May 2022 product manual specifies the following sample requirements:
| Testing purpose | Sample requirement |
|---|---|
| Chemical testing | 50 g of drillings |
| Mechanical testing | 3 metres of wire |
Therefore, the sample quantity identified in the manual is:
- 50 g drillings for chemical testing
- 3 metres of wire for mechanical testing
These quantities should be treated as the sample requirements published in the May 2022 manual. Manufacturers should confirm the current applicable product manual and BIS sampling instructions following Amendment No. 3 before dispatching samples.
6.2 Grouping Guidelines
The product manual provides specific grouping provisions for the grant of licence and changes in licence scope.
Grouping Rule 1 – Wire Diameter
If samples of the lowest wire sizes from the proposed range are tested, higher wire sizes may be included in the licence scope on that basis.
Grouping Rule 2 – Coating Condition
If a sample of galvanized wire is tested, bare wire (bright-drawn) can also be included in the scope of the licence on that basis.
Important conditions:
- The licence scope is restricted by the manufacturing and testing facilities available.
- During licence operation, samples of all varieties covered under the licence should be tested during surveillance to the extent possible.
These grouping provisions can help manufacturers plan their initial sample selection and proposed licence scope.
7. Manufacturing and Quality Control Requirements
A manufacturer applying for BIS certification should demonstrate that the manufacturing process and quality-control arrangements can consistently produce wire conforming to IS 6902:1973.
The product manual requires a suitably equipped and staffed laboratory for the applicable tests.
Depending on the manufacturing arrangement, the production process may involve:
- Procurement of steel wire rod.
- Incoming raw material inspection.
- Chemical composition verification.
- Wire drawing.
- Intermediate dimensional inspection.
- Surface finishing.
- Galvanizing, where applicable.
- Final dimensional inspection.
- Mechanical testing.
- Coil identification and packaging.
- Dispatch with applicable test documentation.
The method of manufacture was modified under Amendment No. 3 to be left to the discretion of the manufacturer or as agreed between the manufacturer and purchaser.
The manufacturer should maintain:
- Raw material inspection records
- Chemical analysis reports
- Production records
- Wire drawing process records
- Diameter inspection records
- Tensile test results
- Bend test results
- Galvanizing records, where applicable
- Calibration records
- Non-conforming product records
- Finished product traceability
8. BIS Scheme of Inspection and Testing
The BIS Product Manual provides a Scheme of Inspection and Testing (SIT) for Steel Wire for Spokes.
Some important control requirements include the following.
8.1 Laboratory Requirements
The manufacturer must maintain a suitably equipped and staffed laboratory for the tests specified in the standard.
The test equipment should be calibrated in accordance with a documented calibration plan.
8.2 Test Records
The manufacturer must maintain records of the tests carried out to establish conformity with the standard.
8.3 Control Unit
The product manual defines a control unit as the entire quantity of steel wire of the same size and type, manufactured from the same input material under similar conditions in one day.
8.4 Levels of Control
The May 2022 product manual specifies the following recommended testing frequencies:
| Test | Sample / Frequency |
|---|---|
| Chemical composition | One sample from each cast |
| Tensile test | One sample from each control unit |
| Bend test | One sample from each control unit |
| Freedom from defects | Adequate inspection |
| Wire diameter and tolerances | One sample from each coil |
| Variation in diameter | One sample from each coil |
The manual states that chemical testing is not required when the input material is already ISI-marked and received with a test certificate.
The manufacturer may propose its own control unit, batch or lot and testing frequency with suitable justification, subject to approval by the concerned BIS Branch Office Head.
8.5 Test Certificate
For each consignment of BIS-certified material conforming to IS 6902, the product manual provides for a test certificate containing:
- Standard Mark
- Cast or control unit number
- Chemical composition results
- Tensile test results
- Bend test results
- Dimensions and tolerances
- Freedom from defects
The test certificate should provide traceability between the dispatched material and the relevant production and testing records.
9. Marking and Packaging Requirements
The product manual specifies requirements for packing and marking of steel wire coils or bundles.
Each coil or bundle should be compactly bound and fastened.
A tag should be legibly marked with:
- Manufacturer’s name or trademark
- Type and size of wire
- Cast number, coil number or batch number
- BIS licence number
- BIS certification details reference
The Standard Mark should be applied only to material conforming to the requirements of the standard and covered by a valid BIS licence.
The marking requirements were updated under Amendment No. 3 in line with the BIS Act, 2016.
10. Documents Required for BIS Certification
The following documents are generally relevant for preparing a BIS application for Steel Wire for Spokes.
A. Company Documents
- Company registration certificate or constitution documents
- GST registration certificate
- PAN card
- Factory address proof
- Authorised signatory details
- Identity and address proof of authorised signatory
- Factory layout plan
- Manufacturing premises details
B. Manufacturing Documents
- Manufacturing process flow chart
- List of manufacturing machinery
- Wire drawing machine details
- Production capacity details
- Product specifications
- Wire diameter range
- Bare or galvanized wire details
- Raw material specifications
- Galvanizing process details, where applicable
- Process control procedures
C. Quality Control and Testing Documents
- Quality control plan
- Inspection and testing plan
- In-house laboratory equipment list
- Calibration certificates
- Chemical analysis reports
- Tensile test reports
- Bend test reports
- Diameter inspection records
- Coating test reports, where applicable
- Finished product inspection records
- Non-conformity and corrective action procedures
D. BIS Application Documents
- BIS application and supporting information
- Product description and proposed scope
- Trademark or brand authorisation documents, where applicable
- Factory and laboratory details
- Applicable declarations and undertakings
- Relevant fee payment details
The final document list depends on the manufacturing arrangement, product scope and applicable BIS certification procedure.
11. BIS Certification Process for Steel Wire for Spokes
The certification process generally involves the following stages.
Step 1: Product and Standard Verification
Confirm that the product falls within the scope of IS 6902:1973.
Identify the proposed wire diameter range and coating condition.
Step 2: Factory and Laboratory Assessment
Review the manufacturing facility, wire drawing machinery, laboratory equipment and quality-control arrangements.
Step 3: Preparation of BIS Application
Prepare the company, manufacturing, product and quality-control documentation.
The proposed licence scope should clearly identify the wire size range and coating condition.
Step 4: Sample Selection and Product Testing
Samples are selected for testing against the applicable requirements of IS 6902:1973.
The May 2022 product manual specifies 50 g drillings for chemical testing and 3 metres of wire for mechanical testing.
The sample requirements should be confirmed against the latest applicable BIS instructions before submission.
Step 5: BIS Factory Inspection
BIS may conduct an inspection to assess:
- Manufacturing machinery
- Wire drawing process
- Laboratory facilities
- Testing equipment
- Quality-control procedures
- Raw material records
- Production and inspection records
- Product marking and packaging
- Sample selection and testing
Step 6: Grant of Licence
After satisfactory assessment of the application, factory facilities and product conformity, BIS may grant the licence to use the ISI Standard Mark.
Step 7: Post-Licence Compliance
After obtaining the licence, the manufacturer must maintain continuous conformity through:
- Routine product testing
- Chemical composition control
- Tensile and bend testing
- Dimensional inspection
- Coating quality control, where applicable
- Calibration of testing equipment
- Maintenance of quality records
- Product traceability
- BIS surveillance compliance
12. BIS Certification for Foreign Manufacturers
Foreign manufacturers intending to supply Steel Wire for Spokes in India must comply with the applicable BIS certification requirements.
They may apply through the Foreign Manufacturers Certification Scheme (FMCS), subject to the applicable requirements.
The process generally involves:
- Product and standard applicability review
- Submission of the applicable BIS application
- Appointment of an Authorised Indian Representative, where required
- Submission of manufacturing and quality-control documents
- Assessment of factory and testing infrastructure
- BIS factory inspection
- Product sample testing
- Grant of licence, subject to satisfactory compliance
Importers should verify that the overseas manufacturer’s BIS licence covers the actual product, size range and coating condition being supplied.
13. BIS Certification Cost for Steel Wire for Spokes
The total cost of BIS certification depends on the proposed licence scope, factory infrastructure, testing arrangements and applicable BIS fee structure.
Potential cost components include:
- BIS application fee
- BIS licence fee
- Annual marking fee
- Product testing charges
- Sample preparation and transportation
- Laboratory charges
- Inspection-related expenses
- Consultancy and documentation charges, where professional assistance is engaged
The BIS LIMS portal has displayed a laboratory-specific testing charge of ₹15,000 for IS 6902:1973, with a separate breakup for certain test parameters.
This is a laboratory-specific published figure and should not be treated as a universal or guaranteed current testing quotation. Actual charges should be confirmed with the selected laboratory.
A project-specific estimate should be prepared after reviewing the product size range, coating condition and existing manufacturing and testing facilities.
14. Common Challenges in BIS Certification
Manufacturers may encounter the following challenges during certification:
1. Incorrect product scope: The proposed product must fall within the scope of IS 6902:1973.
2. Incorrect sample selection: The sample selection should follow the applicable BIS product manual and grouping guidelines.
3. Chemical composition failures: The wire may fail to meet the specified limits for carbon, manganese, sulphur or phosphorus.
4. Tensile test failure: The material may not meet the required tensile properties.
5. Bend test failure: Inadequate ductility or material quality may result in failure.
6. Diameter variation: Inconsistent wire diameter can lead to non-conformity.
7. Zinc coating issues: Galvanized wire may fail the coating mass or uniformity requirements.
8. Inadequate testing infrastructure: The factory may not have suitable equipment for chemical, mechanical and dimensional testing.
9. Incomplete traceability: The manufacturer should maintain clear identification of input material, cast number, production batch and finished coils.
10. Outdated testing references: Manufacturers must ensure that testing follows the updated reference standards introduced through Amendment No. 3.
A preliminary factory and documentation assessment can help identify these issues before the formal BIS application.
15. Why Choose Qualitance India for BIS Certification?
Qualitance India provides professional consultancy and regulatory compliance support for manufacturers seeking BIS product certification in India.
For Steel Wire for Spokes under IS 6902:1973, our support can include:
- Product and Indian Standard applicability review
- BIS certification feasibility assessment
- Wire size and coating scope review
- Grouping guideline assessment
- Manufacturing process assessment
- Quality-control documentation
- Laboratory and product testing coordination
- BIS application preparation
- Factory inspection preparation
- Assistance in addressing non-conformities
- Post-licence compliance guidance
Our objective is to help manufacturers understand the applicable regulatory requirements and establish a practical certification process.
Qualitance India – Improving Quality & Competence
Website: https://qualitanceindia.com
Email: info@qualitanceindia.com
Phone / WhatsApp: +91 93106 15170
16. Frequently Asked Questions (FAQs)
Q1. Which Indian Standard applies to Steel Wire for Spokes?
IS 6902:1973 – Specification for Steel Wire for Spokes.
Q2. Is BIS certification mandatory for Steel Wire for Spokes?
The product is included in the Steel and Steel Products (Quality Control) Order, 2024. However, the implementation date was deferred under the 2025 amendment to 20 November 2028, subject to any subsequent notification.
Q3. Which BIS certification scheme applies to IS 6902:1973?
The standard is listed under BIS Scheme-I, under which a manufacturer can obtain a licence to use the ISI Standard Mark.
Q4. Which amendment is applicable to IS 6902:1973?
Amendment No. 3 was issued, with BIS implementation guidelines dated 9 February 2024 and an effective date of 12 June 2024.
Q5. What types of wire are covered under the BIS product manual?
The product manual identifies bare (bright-drawn) and galvanized steel wire.
Q6. What is the sample size under the May 2022 BIS Product Manual?
The manual specifies 50 g of drillings for chemical testing and 3 metres of wire for mechanical testing.
Q7. What are the grouping guidelines under IS 6902:1973?
Testing the lowest wire size can support inclusion of higher sizes in the licence scope. Testing galvanized wire can also support inclusion of bare bright-drawn wire, subject to available manufacturing and testing facilities.
Q8. What tests are required for Steel Wire for Spokes?
The main tests include chemical composition, tensile test, bend test, diameter and tolerance inspection, freedom from defects and zinc coating tests for galvanized wire.
Q9. What is the QCO implementation date for Steel Wire for Spokes?
The 2025 amendment defers the relevant QCO enforcement date by three years from 20 November 2025, making the deferred date 20 November 2028.
Q10. Can foreign manufacturers obtain BIS certification for Steel Wire for Spokes?
Yes. Foreign manufacturers can apply under the applicable BIS Foreign Manufacturers Certification Scheme, subject to the relevant requirements.
Q11. What is the cost of BIS certification for Steel Wire for Spokes?
The cost depends on BIS fees, testing charges, product scope, sample requirements, factory infrastructure and other applicable expenses.
17. Conclusion
Steel Wire for Spokes is an important material used in bicycle, motorcycle and other spoke-based wheel assemblies.
IS 6902:1973 establishes requirements relating to chemical composition, tensile strength, bend performance, wire dimensions, tolerances, freedom from defects and zinc coating.
The BIS Product Manual PM/6902/1 provides useful guidance on sample size, grouping guidelines, testing equipment, quality control, marking and test certification.
Manufacturers should also take note of Amendment No. 3, which updated the manufacturing, chemical testing, tensile testing, bend testing and marking provisions.
Although the product is included in the Steel and Steel Products QCO framework, the relevant implementation date has been deferred to 20 November 2028 under the 2025 amendment, subject to further regulatory changes.
Proper product scope selection, sample planning, laboratory readiness and documentation are essential for a smooth BIS certification process.
Need assistance with BIS Certification for Steel Wire for Spokes?
Contact Qualitance India for professional guidance on product applicability, BIS application preparation, sample testing, factory readiness and certification support.
Qualitance India – Improving Quality & Competence
Official References and Further Reading
- BIS Product Manual PM/6902/1, May 2022: https://www.bis.gov.in/wp-content/uploads/2022/05/PM-6902.pdf
- BIS Circular CMD-2/16:6902, dated 9 February 2024 – Implementation of Amendment No. 3: https://www.services.bis.gov.in/tmp/Circular_kfQ6_2024-02-09.pdf
- BIS Scheme-I Product Listing: https://www.bis.gov.in/product-certification/products-under-compulsory-certification/scheme-i-mark-scheme/
- Steel and Steel Products (Quality Control) Order, 2020: https://www.bis.gov.in/wp-content/uploads/2020/07/Steel-QCO-2020-dated-27th-May-2020.pdf
- Steel and Steel Products (Quality Control) Order, 2024: S.O. 3716(E), dated 29 August 2024.
- Steel and Steel Products (Quality Control) Amendment Order, 2025: S.O. 5134(E), dated 20 November 2025.
- BIS Laboratory Information Management System: https://lims.bis.gov.in/
- BIS Know Your Standard: https://www.bis.gov.in/know-your-standard/
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