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Steel stud bolt

Steel stud bolts are manufactured from carbon or alloy steel with precise chemical compositions including carbon, manganese, phosphorus, and sulfur, making them widely used in industrial connections. Depending on the grade, their tensile strength ranges from 60 to 150 ksi. Common grades like ASTM A193 B7 specify a minimum tensile strength of 125 ksi and a yield strength of 105 ksi. Threads are produced according to ASME B1.1 standard with 2A or 3A class fits and have very tight dimensional tolerances. Standard diameters range from 1/4 inch to 4 inches, and lengths can extend to several meters. Surface treatments such as black oxide or hot-dip galvanizing enhance corrosion resistance and durability.

Heat treatment for steel stud bolts includes quenching at 850 to 900 degrees Celsius followed by tempering around 600 degrees Celsius. This process improves hardness, fatigue resistance, and structural stability. Final hardness varies by grade, typically ranging from 200 to 350 Brinell or 24 to 35 Rockwell C. These stud bolts perform well in temperature ranges between minus 29 and plus 427 degrees Celsius. Quality control includes tensile testing, hardness measurement, chemical analysis, and, when required, non-destructive testing such as UT and MPI. Steel stud bolts play a critical role in oil, gas, power plants, metal structures, and pressure vessel industries.

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