What is the diameter and length of an AN4-6 bolt?

• A. 1/4" in diameter, 3/4" in length
• B. 1/8" in diameter, 1/2" in length
• C. 3/8" in diameter, 1" in length
• D. 1/2" in diameter, 1-1/2" in length

Answer: (A)

In AN bolt designations, the first number after AN identifies the diameter, and the dash number shows the grip length in eighths of an inch. So AN4 means a 1/4 inch diameter bolt. The dash 6 means a grip length of 6/8 inch, which is 3/4 inch. Therefore, an AN4-6 bolt has a 1/4 inch diameter and a 3/4 inch grip length (the portion under the head through the unthreaded area; the total length can be longer due to the threaded portion).