A Grade 8.8 High Tensile Hex Bolt is a fastener designed for high tensile strength applications. The grade refers to the structural grade or strength of the bolt. In this case, the 8.8 indicates that it has a tensile strength of at least 800 MPa (megapascals). Bolts like these are often used where high clamping force is required, such as structural connections, machinery components, and automotive parts. Made of high-carbon steel or alloy, they usually have a plain or zinc finish.

Grade 8.8 High Tensile Hex Bolt

SKU: 0036

Color

High Tensile bolts are made from carbon and/or alloy steel. These bolts are quenched and tempered to reach the required tensile strength. They are considered structural-grade bolts and are used in high-strength and load-bearing installations, such as automotive, construction, and machine industries. Under the metric grade of the ISO (International Standard Organization), the bolts are classed from 4.6 to 12.9, where the hardness, ductility, wear, heat resistance, and tensile strength of the bolt rise with the numerical value. The class of the bolt is punched into the head of the bolt and is a visible indication of a metric bolt. The six sides of the hex head allow a firm grip during tightening or loosening. This bolt is used with a torque wrench/gun to reach the proper preload of the bolt. Commonly with a zinc (galvanized) or plain (oiled) finish, these bolts can come with a shank and thread or with a full-threaded grip length. The bolt's diameter, length, and class depend on the manufacturer’s specifications.