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Bolts are categorized based on their tensile strength and the mechanical force they can withstand. The higher the numerical value of a grade, the greater its strength.
Bolts are available in a range of grades, which typically represent the tensile strength of the bolt. Bolts are typically steel fasteners designed with exterior male threads. Marsh Fasteners describes the tensile strength and grades of bolts for different uses. Continue reading to find out more.
So, how strong is a bolt when it is pulled? Tensile strength, in simple terms, is the most stress or pressure a bolt can handle. So, the higher the tensile strength, the more force the bolt can take. This means that it can be used in high-stress situations like industrial machinery or to hold heavy things together. Most high-tensile bolts look like these:
A grade 2 bolt is easy to spot because it has no markings at all, and its tensile strength is usually between 60,000 and 74,000 psi. Depending on what they are used for, Grade 2 bolts can have only some threads or all of them. Most of the time, these bolts are used for non-critical joints and applications in design, manufacturing, and maintenance. This is because they are inexpensive. The range of standard sizes for a grade 2 bolt is from 1/4 inch to 4 inches.
A grade 5 bolt is made of medium carbon steel and is hardened to make it stronger and last longer. It has 3 radial lines and a tensile strength between 105,000 and 120,000 psi. Most of the time, they are used in cars or other places that need medium strength. Most Grade 5 bolts come in sizes between 14 inches and 112 inches.
The high-strength grade 8 bolt is easy to spot because it has six raised dashes. It is made of medium-carbon alloy steel that has been quenched and tempered. This gives it a tensile strength of 150,000 psi, which is much higher than the 64,000 psi of a grade 2 bolt. In other words, a grade 8 bolt is stronger than a grade 2 SAE American Grade bolt by more than twice as much. Grade 8 bolts are often used in tough situations, like in the suspensions of cars. Industrial machinery, motors, pumps, valves, and tanks are some other things that need the strength and tolerance of a grade 8 bolt.
Fasteners manufactured with Grade S can withstand extreme pressures and are extremely robust. Grade S Bolts are used in a wide range of applications that need heavy loads.
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