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High Tensile Structural Bolts Manufacturer & Exporter in India | BigBoltNut

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Big Bolt Nut
High Tensile Structural Bolts Manufacturer & Exporter in India | BigBoltNut

We are renowned manufacturer, supplier and exporter of high tensile structural bolts. Structural bolt assembly is used in both preloaded and non-preloaded applications. Available in 10.9 and 8.8 grades. The structural Bolts following EN 14399-4 and DIN 6914 is to use thinner nuts and shorter thread lengths to obtain the required ductility by plastic deformation of the threads within the nut. We offer HV bolts & nuts in 8.8 and 10.9 grade, the choice of the grade depends upon the application and requirement of the customer. The grades 8.8 or 10.9 have separate mechanical characteristics which are defined in the above sheet.


We can offer surface finishing as per customer requirement in hot dip galvanising, we take special care to ensure there is no hydrogen embrittlement in 10.9 grade with our special curing system which ensures that 10.9 grade bolts are not damaged by hydrogen embrittlement post galvanising process. We also do zinc electroplated in blue, yellow or black colour as per customer requirements.

Special coatings in specific industries require zinc flake coatings, these coatings are done as per ISO 10683, depending upon customers requirement for salt spray life we offer coating systems from NOF Japan and Doerken from Germany, these coatings are provided with the help and support of our partners who have the required licence and have successfully done validations with our existing customers. Salt spray life can vary from 500 to 1500 hours.

Black oxide or black coating is a general type of coating offered on bolts & nuts & stud bolts to give a pleasant appearance and to prevent any rusting during transportation or storage, the normal salt spray life for the fasteners applied with such coatings is often less than 100 hours

Xylan is a brand name of With fort USA and is a special coating applied on fasteners / stud bolts where extreme temperatures and harsh condition exist. The Highlights of this coating is that it gives


Our Structural bolts are used in the heavy industry, wind energy sectors, tower connection or join, marine, ship building, oil and wind energy.


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