These nuts have good chemical resistance and may be mildly magnetic. they maintain their strength in high-pressure and high-temperature environments and are used with astm a193 bolts to fasten pressure tanks, valves, and flanges. also known as heavy hex nuts, they are about 10% wider and taller than standard hex nuts and distribute the load over a large area.
Astm a193 grade b7 is a standard material specification for chromium-molybdenum alloy steel fasteners for use in high tensile, high temperature and special purpose applications. grade b7 is a heat-treated chromium-molybdenum alloy steel with minimum tensile requirement of 100 ksi, yield of 75 ksi and maximum hardness of 35 hrc.
The astm a320 l7m stud bolts have chromium ranges up to 18% and nickel ranges up to 14% with molybdenum ranges up to 3%. these material compositions make the a320 fasteners corrosion resistant, strong and ductile. the applications of the astm a320 stainless steel bolts are used in a number of 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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