Turn these metric screws by hand using the hex head, or tighten them with a wrench for extra torque. With an extended tip that locks into a mating hole or slot—sometimes known as a dog point—they are often used to align and secure parts such as gears and pulley wheels. These screws are made of Class 8.8 steel, which is twice as strong as low-strength steel and can be used to fasten most machinery and equipment. All meet DIN 561B, an international standard for hex head set screw dimensions.

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