On the morning of September 29th, a group standard evaluation meeting of "Made in Zhejiang" was held at the beautiful West Lake in Hangzhou. The group standard of "High-strength Bolts, Nuts and Was...

High-strength bolt is a kind of mechanical accessory, which is made of high-strength steel or a bolt that needs a large pre-tightening force, and can be called high-strength bolt. It is widely used...