BIS-ISI-CERTIFICATE
IS 6623 : 2004
Bolts, Nuts & Fasteners - High Strength Structural Nuts
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1. Summary about High Strength Structural Nuts
High strength structural nuts are used with high strength bolts in steel structures and infrastructure projects. They are designed to withstand high clamping forces without thread failure.
2. Why BIS Certificate is Mandatory for High Strength Structural Nuts
BIS certification is mandatory to ensure mechanical strength, thread accuracy, and compatibility with structural bolts. Failure can compromise entire joints.
3. What is BIS Certified for High Strength Structural Nuts
BIS certification verifies compliance with Indian Standards covering hardness, tensile properties, dimensions, and surface finish.
Tests required for High Strength Structural Nuts
| Title | Mandatory/Optional |
|---|---|
| Dimension | Required |
| Thread Requirement | Required |
| Material | Optional |
| Proof Load | Required |
| Hardness | Required |
| Finish | Required |
| Mass of coating | Required |
| Uniformity of coating | Required |
| Adhesion | Required |
| Appearance and defects | Required |
| Anti-seizing test (For hot dip galvanized nut only) | Required |
| Surface discontinuities | Required |
| Bolts (if supplied with nut) | Optional |
| Washers (if provided) | Optional |
4. Benefits of BIS Certification for High Strength Structural Nuts
- Ensures secure structural joints
- Mandatory for infrastructure and steel projects
- Improves resistance to loosening and failure
- Reduces inspection rejections
- Enhances confidence of engineers and regulators
Disclaimer.
The contents of this update are provided for general informational purposes only and do not constitute legal advice. Readers are encouraged to consult with professional legal counsel before taking action based on this information.
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