Bolts, Nuts and Fasteners
High Strength Structural Nuts
Strategic Recommendations for High Strength Structural Nuts (IS 6623:2004)
- Engage Early with BIS & Labs
Begin the BIS Scheme-I licence application, complete product testing as per IS 6623:2004, and align with enforcement dates (1 Aug 2024 / 1 Nov 2024 / 1 Feb 2025). - Partner with Compliance Experts
Consult QCO/BIS specialists (ERA Compliance Team) for documentation, lab testing, ISI marking, and exemption filings. - Contact ERA Support Team
📧 cs@eraglobal.co.in | 📞 +91 9599296331 | 💬 WhatsApp – Assistance for filing, lab coordination, and compliance with import/spares/R&D limits. - Track Notifications & Circulars
Subscribe to the ERA Newsletter for real-time updates on QCO 2024 and BIS circulars. Ensure timely filing for exemptions (export-linked imports, import caps, R&D, spares) and maintain records as prescribed. - Do a Gap Assessment
Check all structural nut SKUs for compliance; verify marking, packaging, and testing readiness; declare non-marked stock within timelines to avail exemptions.
| Section | Details |
|---|---|
| Product Name | High Strength Structural Nuts |
| Applicable Indian Standard (IS) No. | IS 6623:2004 |
| Title of Indian Standard | High Strength Structural Nuts |
| Quality Control Order | Bolts, Nuts and Fasteners (Quality Control) Order, 2024. |
| Notification & Amendments | Notified via S.O. 2771(E), dated 12 July 2024. Supersedes: Bolts, Nuts and Fasteners (Quality Control) Order, 2023 (S.O. 3267(E), dated 21 July 2023). |
| Final Enforcement Date | For Large Enterprises: 1 August 2024, For Small Enterprises: 1 November 2024, For Micro Enterprises: 1 February 2025. |
| Objective & Scope | To ensure reliability, uniform strength, and safety of structural nuts used in critical assemblies such as bridges, towers, and industrial structures through BIS certification under IS 6623:2004. |
| Products Covered | High strength nuts used in steel structures, towers, bridges, heavy machinery, and construction projects. |
| Exemptions | - Products meant exclusively for export. - Imports as part of finished goods/sub-assemblies. - Micro-enterprises (≤ ₹25 lakh plant & machinery, ≤ ₹2 crore turnover). - Export-oriented imports (3-year phased relaxation: 80% in FY 2024–25, 70% in FY 2025–26, 50% in FY 2026–27). - R&D imports up to 200 kg/year. - Spares/after-sales service up to 5% of 2023–24 imports. |
| Industries Impacted | Construction & Infrastructure, Transmission Towers, Railways, Bridges, Aerospace & Defence, Heavy Engineering & Fabrication. |
| Mandatory Compliance | ISI marking mandatory under BIS license (Scheme-I, BIS Conformity Assessment Regulations, 2018). |
| Apply for BIS license, complete lab testing, declare exempt stock, ensure ISI marking before sale/import. | Apply for BIS license, Complete testing in BIS-recognized labs, Declare old/imported stock for exemptions, Ensure ISI marking before sale/import. |
| Legal Framework Provision & Enforcement | Enforced under BIS Act, 2016. BIS is the certifying authority; violation punishable under the Act. |
| Penalties for Non-Compliance | Seizure of non-compliant goods, suspension/cancellation of license, fines, imprisonment up to 2 years or both. |
| Conclusion | BIS certification is mandatory for high strength structural nuts under IS 6623:2004. The 2024 QCO supersedes the 2023 Order with staggered enforcement dates. |
| References / Annexures | QCO 2024: S.O. 2771(E) [12 July 2024]; Superseded QCO 2023: S.O. 3267(E) [21 July 2023] |
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Notification
High Strength Structural Nuts (IS 6623:2004) have been brought under compulsory BIS certification through the Bolts, Nuts and Fasteners (Quality Control) Order, 2024, notified via S.O. 2771(E) on 12 July 2024. This order replaces the 2023 QCO, making certification mandatory.
Enforcement Timeline
- Large and Medium Enterprises: 1 August 2024
- Small Enterprises: 1 November 2024
- Micro Enterprises: 1 February 2025
Overview
High strength structural nuts are heavy-duty fasteners designed for use in load-bearing applications such as bridges, towers, and steel structures. They are engineered to withstand high stress, vibration, and dynamic loading conditions, ensuring the safety and integrity of critical infrastructure.
Objective & Scope
IS 6623:2004 specifies requirements for material composition, mechanical strength, dimensions, and surface quality of high strength structural nuts. The aim is to ensure that nuts used in critical joints meet uniform safety and performance standards.
Products Covered
The standard covers high strength nuts used in bolted assemblies of steel structures, heavy machinery, power transmission towers, bridges, and railway infrastructure.
Exemptions Provided
The QCO exempts (i) products exclusively for export, (ii) imports as part of finished goods or sub-assemblies, (iii) production by micro-enterprises (≤ ₹25 lakh investment, ≤ ₹2 crore turnover), (iv) export-linked imports with phased reduction (80% in FY 2024–25, 70% in FY 2025–26, 50% in FY 2026–27), (v) R&D imports up to 200 kg/year, and (vi) imports/domestic procurement for spares or after-sales service up to 5% of 2023–24 import value.
Industries Impacted
Majorly impacted are construction and infrastructure projects, heavy engineering, steel fabrication, power transmission, aerospace & defence, and transport structures where reliability of structural fasteners is critical.
Mandatory Compliance Requirements
All high strength structural nuts under IS 6623:2004 must carry the ISI mark under a BIS license obtained through Scheme-I. Testing must be conducted at BIS-recognized laboratories, and packaging/documentation must clearly bear the ISI mark.
Next Steps for Stakeholders​
- Manufacturers should apply for BIS licensing, align manufacturing processes with IS 6623:2004, and ensure ISI-marked output. Importers should check exemption eligibility and declare old stock. Infrastructure developers and fabricators must procure only certified nuts.
Legal Provisions, Enforcement & Penalties
The BIS Act, 2016 empowers BIS as the certification and enforcement authority. Non-compliance can lead to product seizure, cancellation of license, monetary penalties, and imprisonment up to two years.
Conclusion
From 1 August 2024 (with staggered dates for SMEs), high strength structural nuts must comply with IS 6623:2004 and bear the ISI mark. The QCO 2024 enforces standardization and quality in structural fastening, essential for India’s infrastructure and engineering reliability.
Ready to start your certification journey?
Let us help you navigate regulatory challenges and achieve certification with ease. Leave us your details, and we’ll get back to you—or request a free consultation today.