Bolt Nut and Washer grade meaning:
According to relevant standards, the performance grades of carbon steel and alloy steel Bolt Nut and Washer are divided into more than 10 grades: 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, among which Bolt Nut and Washer of grade 8.8 and above is made of Low-carbon alloy steel or medium-carbon steel with heat treatment (quenching, tempering) is generally called high-strength Bolt Nut and Washer, and the rest are generally called ordinary Bolt Nut and Washer. The Bolt Nut and Washer performance grade label consists of two numbers, which respectively represent the nominal tensile strength and yield ratio of the Bolt Nut and Washer material. Stainless steel Bolt Nut and Washer is divided into A1-50, A1-70, A1-80, A2-50, A2-70, A2-80, A3-50, A3-70, A3-80, A4 according to the performance level of the steel category -50, A4-70, A4-80, A5-50, A5-70, A5-80, C1-50, C1-70, C1-110, C4-50, C4-70, C3-80, F1-45 , F1-60. The first letter and number represent the group of stainless steel, and the second and third numbers represent 1/10 of the tensile strength.
