The basic concept: oval head bolts are non-standard parts, which are mainly used in ball mill, crusher, and power plant equipment. Used for a wide range, so that the liner on the ball mill tightening effect.
Bolt performance grade and meaning
The performance grade of the elliptical bolt can be divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9, among which 8.8 and above are low carbon alloy steel or medium carbon steel Heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest known as ordinary bolts. The bolt performance grade label consists of two parts, representing the nominal tensile strength and yield ratio of the bolt material, respectively. E.g:
Performance grade 8.8 bolts, its meaning is:
1, the bolt material nominal tensile strength of 800MPa level;
2, the strength ratio of the bolt material is 0.8;
3, the nominal strength of the bolt material to 800X0.8 = 640MPa level
Bolt performance level is the meaning of the international standard, the same performance level of the bolt, regardless of the difference between its material and origin, its performance is the same, the design can only use the performance level.
Bolt strength grade 8.8 is the bolt shear stress rating of 8.8GPa.
Bolt performance grade and meaning
Performance grade 8.8 bolts, its meaning is:
1, the bolt material nominal tensile strength of 800MPa level;
2, the strength ratio of the bolt material is 0.8;
3, the nominal strength of the bolt material to 800X0.8 = 640MPa level
Bolt performance level is the meaning of the international standard, the same performance level of the bolt, regardless of the difference between its material and origin, its performance is the same, the design can only use the performance level.
Bolt strength grade 8.8 is the bolt shear stress rating of 8.8GPa.
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