What is the minimum length of a bolt required for a 3/4" diameter bolt, assuming a grip distance of 1"?

For a 3/4" diameter bolt with a grip distance of 1", the minimum length of the bolt can be determined by adding the grip distance to the necessary thread length required for proper engagement in the nut.

Typically, a bolt needs to have enough length beyond the grip to allow for proper fastening without the risk of stripping the threads or compromising the joint. For a bolt of this size, one needs to account for the thickness of the materials being fastened together, which is essentially captured in the grip distance.

The formula for determining bolt length generally includes adding the grip distance to a specific amount to ensure a safe and effective fastening: this often involves adding around 1.25 inches for proper thread engagement, especially in structural applications.

Thus, for a grip distance of 1", a safe minimum total bolt length would be:

1" (grip) + 1.25" (for thread engagement) = 2.25". This rounds to 2 1/4 inches, which is why this answer is the correct choice in the context of structural ironwork applications.