Which bolt specification is AN4-6?

• 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)

AN fasteners are named with a diameter part and a length part after a dash. The number after AN tells you the bolt’s diameter in standard size steps, and the dash number tells you the overall length in fractional inches (in eighths of an inch). For AN4, the diameter is 1/4 inch. The trailing -6 means six eighths of an inch, which is 3/4 inch. So AN4-6 is a bolt that is 1/4 inch in diameter and 3/4 inch long. That matches the option describing a 1/4" diameter and 3/4" length. The other choices don’t fit the AN4 size because their diameters correspond to other AN sizes, not 1/4 inch.