Although most bolt manufacturers recommend at least 1.5 times the bolt diameter… I believe threading the eyebolt at least 2 times the diameter will provide a much higher degree of confidence.

Most mold makers will thread the holes to a depth of 2.5 times the diameter or more… but it is always best to check the depth to make sure.

When specifying your tooling, always make sure the eyebolt holes are at threaded at least 2.5 times the diameter of the eyebolt.

-Andy