Q. What is dedendum for external threads?
✅ Correct Answer: (A)
radial distance between pitch and minor cylinder
Explanation: addendum for an external thread is defined as the radial distance between the major cylinder and pitch cylinder and for internal addendum is the radial distance between the minor cylinder and pitch cylinder. dedendum for external thread is the radial distance between the pitch cylinder and minor cylinder and this is the radial distance between the major and pitch cylinders for internal thread.