Bolt length is composed of which two parts?

• A. Grip length only
• B. Thread length only
• C. Grip length and thread length
• D. Head thickness

Answer: (C)

Bolt length is the distance from under the head to the tip, and it’s made up of two parts: the grip length, which is the smooth, unthreaded portion, and the thread length, which is the portion that has threads. When you add those two together, you get the total length of the bolt. The head thickness isn’t counted in this length because the measurement starts beneath the head. So the best answer is grip length plus thread length.