In selecting fasteners, what does the grade indicate?

In selecting fasteners, what does the grade indicate?

• A. The length of the fastener
• B. The color of the fastener
• C. The strength and hardness of the fastener
• D. The thread count

Answer: (C)

Grade tells you how strong and hard a fastener is. It reflects the material’s strength and the heat treatment it’s undergone, so higher grades mean higher tensile strength and greater hardness. This matters because you choose a grade based on the load the joint must carry and the environment, ensuring the fastener won’t yield or fail under stress. Length, color, and thread count don’t indicate strength: length is about fit, color is usually a coating or finish, and thread count is about how the bolt threads mate with a nut or tapped hole.

Grade tells you how strong and hard a fastener is. It reflects the material’s strength and the heat treatment it’s undergone, so higher grades mean higher tensile strength and greater hardness. This matters because you choose a grade based on the load the joint must carry and the environment, ensuring the fastener won’t yield or fail under stress. Length, color, and thread count don’t indicate strength: length is about fit, color is usually a coating or finish, and thread count is about how the bolt threads mate with a nut or tapped hole.