What is the minimum distance a 1/4" diameter bolt can be placed from the edge of metal to the center of the fastener?

The minimum distance a 1/4" diameter bolt can be placed from the edge of the metal to the center of the fastener is correctly identified as ½". This distance ensures that there is sufficient material around the bolt to maintain structural integrity and prevent any potential tear-out or failure of the metal sheet.

Positioning the bolt too close to the edge can lead to a few issues. If the bolt is set within ¼" of the edge, the surrounding metal may not provide adequate support, leading to weakening around the fastener. This is particularly critical when the assembly is subjected to tension, shear, or other forces during operation. A distance of ½" helps to mitigate these risks by distributing the stress over a larger area, which enhances the holding capability of the fastener and ensures the reliability of the connection.

While the other options suggest various distances, they do not account for the recommended spacing typically prescribed for ensuring the longevity and effectiveness of the fastening in metal applications. Thus, maintaining a minimum of ½" is an industry standard to prevent mechanical failures in HVAC and other sheet metal applications.