BIS Certification for Locknuts and Locking Devices for Rolling Bearings IS 16605 (Part 2):2018

In the realm of rotating machinery, rolling bearings play a pivotal role in ensuring smooth and efficient operation. However, their performance is closely tied to the accessories that hold them in place and prevent undesired motion. Among these accessories, locknuts and locking devices serve a crucial function—they ensure proper axial location and secure fastening of bearings and other machine elements to the shaft.

Recognizing the importance of standardization in these components, the Bureau of Indian Standards (BIS) has introduced IS 16605 (Part 2):2018, a standard that mirrors the global benchmark ISO 2982-2:2013. This standard sets out the dimensional and design requirements for locknuts and locking devices used in conjunction with rolling bearings.

Understanding Locknuts and Locking Devices in Bearing Systems

Locknuts, also referred to as shaft nuts or bearing nuts, are threaded fasteners used to locate and secure bearings onto shafts. These components are essential in applications where axial movement must be prevented, such as in rotating shafts, gear assemblies, pulleys, and belt-driven systems.

To prevent loosening under dynamic loads or vibrations, locking devices are used in conjunction with locknuts. These include components such as lock washers, retaining plates, or other mechanical interlocking systems that secure the nut in position once it has been tightened.

Locknuts and locking devices come in various sizes, thread types, and configurations depending on the specific bearing series, shaft size, and application requirements. Their correct selection and installation are critical for ensuring bearing alignment, reducing mechanical failure risks, and increasing equipment life.

IS 16605 (Part 2):2018 – Scope and Significance

The Indian Standard IS 16605 (Part 2):2018, harmonized with the international standard ISO 2982-2:2013, specifies the dimensions, tolerances, and compatibility parameters for locknuts and locking devices used with rolling bearings.

This standard covers:

● Metric thread sizes and tolerances suited for locknuts and locking devices.

● Dimensional consistency to ensure interchangeability across manufacturers and markets.

● Designations for locknuts to be used with adapter sleeves, withdrawal sleeves, and directly on shafts.

● Specifications for locking devices such as tab washers, lock plates, or retention clips, depending on the type of nut and application.

By defining these specifications, IS 16605 (Part 2) ensures that locknuts and locking devices used in critical assemblies maintain structural integrity, safety, and ease of installation.

Regulatory Framework – Bearing Components and Accessories (Quality Control) Order, 2025

To reinforce quality assurance and eliminate substandard mechanical components from the Indian market, the Ministry of Commerce and Industry has issued the Bearing Components and Accessories (Quality Control) Order, 2025.

Under this order, locknuts and locking devices are listed among the mandatory components that must conform to their respective Indian Standards, in this case, IS 16605 (Part 2):2018.

Key Mandates of the Order:

● Manufacturers and importers must ensure that their products conform to IS 16605 (Part 2).

●Products must bear the Standard Mark (ISI mark) issued under a valid license from the Bureau of Indian Standards.

●Different implementation timelines may apply based on the size and nature of the manufacturing unit, giving flexibility to smaller enterprises while ensuring uniform compliance across the board.

BIS Certification Process for Locknuts and Locking Devices

BIS certification under this standard involves a rigorous conformity assessment process to ensure product quality and adherence to regulatory norms. The steps typically include:

  1. Filing an application to BIS with detailed product specifications, quality management system documents, and test reports.

  2. Factory inspection by BIS auditors to verify manufacturing capability, equipment, testing infrastructure, and quality controls.

  3. Product testing of locknuts and locking devices at BIS-recognized laboratories to confirm compliance with IS 16605 (Part 2):2018.

  4. Grant of BIS License upon successful audit and testing.

  5. Ongoing surveillance by BIS to ensure continued compliance through periodic inspections and testing of market samples.

To Know The Process in Detail, Please Visit:

Under BIS Registration Products ISI and CRS

Documents Required for BIS Certification

To apply for BIS certification, manufacturers need to submit the following documents:

●  Application form

●  Manufacturing process details

●  Quality control plan

●  Test reports from BIS-approved laboratories

●  Factory layout and equipment details

●  Proof of business registration

●  Product specifications and technical details

●  Declaration of conformity to Indian standards

Additionally, manufacturers may be required to provide proof of compliance with environmental and safety regulations, depending on the specific type of product being certified.

BIS ISI Mark Certification Costing And Timeline

BIS ISI Mark Certification Costing And Timeline

Importance of BIS Certification

The BIS certification for locknuts and locking devices offers a range of benefits for stakeholders across the supply chain:

● For manufacturers, it demonstrates adherence to high-quality standards, boosts credibility, and enables access to government procurement and export opportunities.

● For buyers and end-users, it assures that the components are dimensionally accurate, compatible, and safe for use in critical applications.

● For regulators and industry bodies, it streamlines market surveillance and helps prevent the circulation of counterfeit or substandard products.

Ultimately, BIS certification fosters a culture of quality, safety, and accountability within the bearing components manufacturing ecosystem.

Conclusion

Locknuts and locking devices may be small mechanical components, but their role in maintaining the stability and precision of rolling bearing assemblies is irreplaceable. By complying with IS 16605 (Part 2):2018 / ISO 2982-2:2013, manufacturers not only align with international best practices but also reinforce trust among industrial buyers and end-users.

With the enforcement of the Quality Control Order, 2025, BIS certification has become a non-negotiable requirement for those involved in the production or import of these bearing accessories. As India continues to elevate its manufacturing standards, such regulatory measures will be key to ensuring product consistency and international competitiveness.