It is important to remember that relatively few tools break as a result of material or workmanship defects.
A defective tool is likely to fail immediately due to the severe stresses imparted by the heavy, repetitive blows of the hammer. A tool which breaks after considerable service, evidenced by a well worn shank and blade, is not likely to be defective but would fall into one of the categories noted at the bottom of the page.
To prolong tool life and ensure safe use of the product, here are a few guidelines to follow.