What size bolt fits a hole that is drilled to .18750?

When determining the size of a bolt that fits a hole drilled to a diameter of .18750 inches, it is important to understand the corresponding sizes of the bolts mentioned.

The AN bolt specifications indicate the nominal diameter of the bolt in inches. For this case:

• The AN3 bolt has a nominal diameter of 3/16 inch, which is equivalent to 0.1875 inches. This matches exactly with the drilled hole size of .18750 inches.

• The AN4 bolt has a nominal diameter of 1/4 inch, larger than the drilled hole.

• The AN5 bolt has a nominal diameter of 5/16 inch, also larger than the drilled hole.

• The AN6 bolt has a nominal diameter of 3/8 inch, which is significantly larger than the hole drilled.

Since the AN3 bolt is the only option that has a nominal diameter that aligns perfectly with the drilled hole size of .18750 inches, it is appropriate to conclude that the AN3 is the correct answer.