The Hexagon Nuts (Style 1) Product Grade C find extensive application in construction,
engineering, machine, automotive, and industry fastening applications that need reliable and
strong threads for connecting bolts. It plays an important role in determining the durability of the
bolted assembly. Considering their significance in terms of their being critical fastening
components, the hexagon nuts should conform to the provisions of IS 1363 (Part 3):2018 for
Hexagon Nuts (M5 to M64) series.
The Indian standard specifies several technical aspects of hexagon nuts such as dimensions,
threads, material, mechanical properties, proof load capacity, surface finish, and anticorrosive
coating. Conformance to appropriate QCOs of BIS and certification of products as per IS 1363
(Part 3):2018 is necessary for product market entry in India. The ISI marking of such hex nuts is
considered a reliable proof of their conformity with Indian standards, which ensures their
usability as fastening elements.
What is IS 1363 (Part 3):2018 for Hexagon Nuts Grade C?
IS 1363 (Part 3):2018 is the Indian Standard which provides the specifications of Hexagon Nuts
(Type 1) having product grade C within the size range of M5-M64. IS 1363:2018 specifies
dimensions, tolerance, thread, material, mechanical and performance requirements to provide
uniformity in the interchangeability and performance of the fasteners. Evaluation criteria of
Hexagon nuts as per BIS include -
- Dimensional accuracy and tolerance requirements
- Thread profile and thread fit verification
- Mechanical strength and proof load performance
- Material composition and hardness properties
- Surface finish and corrosion protection characteristics
Who needs BIS Certification for Hexagon Head Bolts, Screws
and Nuts (Style 1) in India?
BIS certification under IS 1363 (Part 3):2018 is applicable to manufacturers and suppliers
involved in producing or marketing hexagon nuts covered under the standard. Certification
ensures compliance with mandatory quality and safety requirements for industrial fastening
products.
Applicable to -
- Domestic Manufacturers - Must obtain BIS certification before supplying products in
India
- Foreign Manufacturers - Required to secure BIS approval before exporting to the
Indian market
- Importers and Brand Owners - Responsible for sourcing compliant and certified
products
- Industrial Suppliers and Distributors - Must ensure certified products are supplied for
commercial applications
Benefits of BIS ISI Certification for Hexagon Nuts (Style 1)
Certification as per IS 1363 (Part 3):2018 by BIS proves that hexagon nuts satisfy the required
quality and performance standards essential for fastener uses in industries.
- Meets IS 1363 (Part 3):2018 specifications
- Improves reliability of fastening process
- Improves joint strength
- Improves compatibility with bolts and screws
- Minimizes chances of threads breaking and loosening
- Suitable for use in government and infrastructure works
- Improves consistency and quality of products
- Improves consumer confidence and company's reputation in the market
- Increases acceptability in both domestic and international markets
BIS Testing Requirements for Hexagon Nuts as per IS 1363 (Part 3):2018
In order to guarantee the quality and durability of Hexagon Nuts in accordance with IS 1363 (Part 3):2018, the Bureau of Indian Standards lays down certain requirements concerning testing and inspection that must be followed. Through such tests, it is assured that these nuts fulfill all required standard specifications in terms of dimension, threading, mechanical properties, material, and performance characteristics. The following are some of the testing parameters and quality control procedures of Hexagon Nuts (Size range M5 to M64) as per BIS regulations -
BIS Certification Procedure for Hexagon Head Bolts, Screws and Nuts (Style 1) under IS 1363 Part 3
The process of BIS certification for Hexagon Nuts governed by IS 1363 (Part 3):2018 confirms compliance with the quality and dimensional standards. The certification process set by the Bureau of Indian Standards (BIS) guarantees that the products have met the specified Indian Standard consistently prior to their introduction to the market. The usual process involves the following steps -
- Online Registration Manufacturers register on the BIS Manak portal by submitting company, factory, and product details. Foreign manufacturers must appoint an Authorized Indian Representative (AIR).
- Testing at BIS-Approved Laboratory Product samples are tested in BIS-approved laboratories for measurement accuracy, electrical performance and insulation strength.
- Application Submission The application is submitted along with test reports, technical documents, and factory details. Foreign manufacturers must also submit AIR-related documents.
- Factory Inspection BIS officials inspect the manufacturing units to verify the production process, safety measures, and quality control system.
- Grant of BIS License If all the above requirements are satisfactorily met, BIS grants the certification license under Scheme-I.
- Use of ISI Mark Once approved, the manufacturer can affix the ISI mark on the product with a CM/L number, confirming that the product meets BIS standards.
Documents Required for BIS Certification of Hexagon Nuts Grade C
| Document Category | Documents Required |
| Basic Details | GST Certificate, Email ID & Contact Number, Factory & Office Address, Rent Agreement / Lease Deed (if applicable), Partnership Deed (if applicable for partnership firms) |
| Manufacturing Details | List of Machinery, Process Flow Chart, Factory Layout Plan |
| Raw Material Details | List of Raw Materials, Supplier Details, Raw Material Invoices, Raw Material Test Certificates |
| Testing & Quality Control | List of Testing Equipment, Calibration Certificates, QC/Lab In-charge Appointment Letter & Qualification |
| Production Details | Annual Installed Capacity, Last Year Production Value |
| Product & Packaging Details | Quantity per Package, Nature of Packing, Product Printing / Marking Details |
| Management Details | Top Management Details, BIS Communication Contact Person |
| Brand & Certification Documents | Trademark / Brand Certificate, Consent Letter from BIS Recognized Laboratory |
| Additional Documents | Weekly Off Details, Hygiene Document (if applicable), Relaxation Letter (if applicable), Any Other Relevant Document |
| Foreign Manufacturer Requirements | Agreement with AIR (Authorized Indian Representative), Aadhaar Card of AIR, AIR Nomination Form, Required Undertakings, Scope of License |
Foreign manufacturers need to appoint an Authorized Indian Representative (AIR) in India. This person is the local point of contact for the Bureau of Indian Standards (BIS) and takes care of all rules and compliance work in India.
ISI Marking Requirements for Hexagon Head Bolts Grade C under IS 1363 (Part 3):2018
After receiving the BIS certification, the ISI mark of the Hexagon Nuts according to IS 1363 (Part 3): 2018 has to be permanently marked on the item or its package. In addition to the ISI mark, other information like the name or trademark of the company and the License Number of the Certification Marks (CM/L) needs to be marked. Marking is important since it will help in the traceability of the item and also assure the quality of the nuts. More marking specifications can be found below -
| Requirement | Details |
| ISI Mark | Indicates that the product is BIS certified and conforms to standards |
| Standard Number | IS 1363 (Part 3): 2018 |
| CML Number | Certification Marks Licence (CML) number issued by BIS |
| Manufacturer Details | Name of manufacturer or registered trademark |
| Batch / Date | Batch number, heat number, or manufacturing date for traceability |
Note: Marking is typically applied using durable stamping, tagging, or permanent printing to ensure clear identification during handling, storage, and transportation, as per BIS marking requirements.
BIS Licence Validity and Surveillance Requirements under IS 1363 (Part 3):2018
| Particulars | Details |
| Validity | Typically 1 to 2 years, depending on BIS approval conditions |
| Renewal | Must be renewed before expiry by submitting the application along with the prescribed fee and updated documents |
| Surveillance | Includes periodic factory inspections and market sample testing conducted by BIS |
| Compliance Risk | Continuous following to standard and applicable Quality Control Orders (QCOs) is mandatory. Non-compliance or failed sample testing may lead to suspension or cancellation of the BIS license |
BIS Certification Fees for Hexagon Head Bolts, Screws and Nuts under IS 1363 (Part 3):2018
BIS certification cost for hexagon nuts will involve an application fee, an inspection fee, a license fee, a testing fee and a marking fee. These fees are supposed to be paid according to the BIS certification cost guidelines. The costs may differ based on different manufacturing locations.
| Charge Type | Indian Manufacturers | Foreign Manufacturers |
|---|
| Application Fee | INR 1,000 | USD 15 |
| Audit Charges | INR 7,000 | USD 3,200 - 5,900 |
| License Fee | INR 1,000 | USD 15 |
| Marking Fee | As applicable | As applicable |
| Testing Charges | As applicable | As applicable |
| EVTL India Consultancy Fee | As per actual | As per actual |
Note -
- Application fee for foreign manufacturers is payable via SWIFT (SAARC countries may pay in INR with applicable GST).
- Audit charges for foreign manufacturers vary based on country/location.
- The marking fee is determined based on the product category and production volume (MSME benefits may apply).
- Testing charges are paid directly to BIS-recognised laboratories.
- Consultancy fees vary depending on product type and factory location.
Common Mistakes by Manufacturers During BIS Certification under IS 1363 Part 3:2018
For BIS Certification of Hexagon Nuts (Style 1) according to IS 1363 (Part 3):2018, it is necessary to adhere to the quality and testing norms in a stringent manner. Applications submitted by manufacturers usually get delayed or rejected due to certain avoidable reasons related to documentation, testing or production. These should be identified beforehand in order to make the process of obtaining BIS Certification easier.
- Submission of incomplete documents like insufficient information regarding factory details, test report, calibration certificate, quality control information etc.
- Submission of incorrect product specification information about the nut size, property class, finish/coating mentioned in the application/test reports.
- Not adhering to dimensional norms mentioned in IS 1363 (Part 3):2018, including wrong nut dimension and tolerance.
- Inconsistency in thread parameter due to improper manufacturing of threads or lack of adherence to relevant thread gauge norms.
- Inadequate testing facility and lack of properly calibrated equipment for dimensional/mechanical and coating tests.
- Inability to take corrective action against audit observations within stipulated time frame resulting in delay in issuing the license.
Conclusion
Hexagon Nuts (Style 1) which are covered under IS 1363 (Part 3):2018 are key fastening components, and they are needed across construction, engineering, manufacturing, automotive and even infrastructure projects. When manufacturers follow IS 1363 (Part 3):2018, it means they stick to the set expectations for dimensions, thread precision, mechanical strength, proof load behaviour and also the surface finishing quality.
BIS Certification for Hexagon Nuts indicates the product matches the relevant Indian Standard, plus it gives the manufacturer permission to put the ISI Mark on the certified items. This kind of certification is more than just a formality; it shows consistent quality, dependability and proper suitability for fastening uses where performance matters a lot. At the same time it helps with market acceptance and makes customers feel more confident.
Manufacturers who want BIS certification under IS 1363 (Part 3):2018 can get professional support from EVTL India.
