Hex Nut Manufacturers According to provisions of the national standard GB/T 3098.2-2015 "Mechanical Properties of Fasteners Nuts", bolts made of carbon steel and alloy steel have 7 types of mechanical properties under the condition of environmental dimension of 10鈩冿綖35鈩? They are 04, 05, 5, 6, 8, 10, 12 respectively. According to the provisions of the national standard GB/T 3098.15-2014...