Astm a193 b7 is a bolting specification for medium-high temperature applications. it is a heat treated chromium molybdenum steel and is considered for applications up to 450° celsius (840° fahrenheit). astm a320 l7 has the same chemical and physical properties as b7, with additional charpy v notch tests taken at -101° celsius (-150° fahrenheit) for low temperature applications.
Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength. on the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3.6 to 14.9 but in plant and machinery only grades 8.8, 9.8, 10.9 and 12.9 are normally found.
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