Which of the following is not a common socket drive size?

The common socket drive sizes are standardized to ensure compatibility with various tools and fasteners, allowing for efficient use in automotive repair and maintenance. The sizes 1/4", 3/8", and 1/2" are widely utilized, each serving distinct purposes in terms of torque and application.

The 1/4" drive is typically used for lighter-duty tasks or in tight spaces where less torque is required. The 3/8" drive strikes a balance by being versatile and is primarily used for general automotive repairs. The 1/2" drive is designed for heavier tasks, providing the necessary torque for larger fasteners and bolts.

On the other hand, the 5/8" drive is not a standard socket drive size. While the measurement itself could correspond to a fractional size of a socket, it is not recognized as a common drive size like the others mentioned. Tools are categorized by the drive size that fits the socket in use, and thus 5/8" does not conform to the standardized sockets commonly found in toolsets for automotive work.