BIS Certification for High Strength Structural Bolts

Most fasteners fail quietly - a loose bracket, a squeaky panel. High strength structural bolts are different. They sit in friction-grip joints that hold up bridges, multi-storey steel frames and transmission towers, and a failure here is rarely a minor inconvenience. That is the entire reason this category exists as its own certification: it is not just "a stronger bolt," it is a bolt whose job is to keep a structure standing under sustained load, vibration and weather, for decades.

Bolts in this family are typically manufactured in higher property classes, capable of carrying far greater tensile and shear loads than a general-purpose hexagon bolt. Engineers specify them precisely because the structural calculation depends on the bolt performing exactly as rated - which is exactly what BIS certification is meant to verify before that bolt ever reaches a job site.

Testing for this category goes well beyond a simple dimension check. A BIS-recognised laboratory verifies tensile strength and proof load - essentially, how much pulling force the bolt can sustain before it permanently deforms or breaks - along with hardness and the underlying chemical composition of the steel. Dimensional accuracy of the head, shank and thread is checked too, since a structural bolt that does not seat correctly in its joint defeats the purpose of using a high-strength fastener in the first place.

The licence is issued only to the manufacturer, never to a trader or stockist, and BIS continues periodic surveillance testing for as long as the licence is active.

If your factory manufactures high strength structural bolts for sale in India, this licence is not optional - it is what allows your product onto government, infrastructure and EPC project sites, most of which will not accept an unmarked fastener regardless of its actual quality. The same narrow exemptions that apply across the wider fastener order apply here too: goods manufactured purely for export, fasteners imported only as part of a finished assembly, and small Udyam-registered micro units under specific limits. We explain these in detail on our main fasteners page.

The path you take depends entirely on where your factory is. If you manufacture in India, the process runs through BIS's standard product certification route - sample testing, factory documentation and a factory inspection before the licence is issued. We have laid out every step on our BIS Certification for Indian Manufacturers page.

If your factory sits outside India, you will go through the Foreign Manufacturers Certification Scheme, which adds an Authorized Indian Representative and typically an overseas factory audit. The full breakdown is on our FMCS guide for foreign manufacturers.

Fasteners are a deceptively tricky category - 19 products, overlapping standards, easy-to-miss exemptions and a demanding factory audit. We work across the entire fasteners QCO, not as a general firm dabbling, but as a team that knows this product family inside out and prepares every document to exact BIS specification so your file keeps moving - for manufacturers in India and around the world.