Heavy-duty bolt

A heavy-duty bolt differs from the standard version in its ability to withstand temporary loads of 800 MPa. Its physical parameters and technical characteristics are regulated by GOST 52644-2006. In appearance it is the same threaded rod with a hexagon head. Heavy-duty bolts are identified by their marking: the designation includes a property class in the range 8.8-12.9.

High-strength fasteners are made from a low-carbon steel alloy (alloy steel). Blanks are cold- or hot-headed, with thread cutting performed afterward on special equipment. The heavy-duty bolt undergoes heat treatment and is coated with a corrosion-resistant finish. Per the standard, bolt diameter ranges from 16-48 mm and length from 40-300 mm.

The application area for heavy-duty bolts is high operating loads and demanding environmental conditions.