1、The strongest commercial-quality bolt is grade 8,Bolts are everywhere. They’re part of commercial and industrial products and make up complex machines and simple gardening tools. From a manufacturing standpoint, bolts are among the most produced mechanical fasteners available. They come in different grades to help people better understand their intended use.
2、Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.