What is the meaning of the 8.8 on the screw
Alina: refers to the strength of the thread level, the decimal point in front of the tensile strength, 8 is 800MPa, 10 is 1000MPa, the decimal point behind the value of the yield limit and the tensile limit ratio, .8 is 0.8.
8.8 is a high-strength screw! 6.8 is the strength of 4.8 is the national standard screws the highest high-strength screws is 12.9 I have seen the best and most exquisite
4.8 and 8.8 refer to the performance level of the bolt. Other bolt headers are 10.9 and 12.9. The higher the level, the better the performance of both bolts. 4.8 is defined as: 4 represents 4 * 100 = 400MPa, refers to the tensile strength of bolts 400MPa, .8 for the yield ratio of 0.8, the nominal yield strength of 400 × 0.8 = 320MPa 8.8 grade bolts performance: tensile strength = 800MPa, yield strength = 800 * 0.8 = 640MPa
The so-called 8.8 grade refers to the bolt shear stress rating of 8.8GPa
