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.
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