Section 29.68. Piston tool—low velocity type

This tool utilizes a piston to drive a stud, pin, or fastener into a work surface. When it is used with any commercially available powerload that chambers in the tool and a proper stud, pin, or fastener, the piston does not cause the stud, pin or fastener to have a velocity in excess of 300 feet per second when measured 6 feet 5 inches from the muzzle end of the barrel. This measurement is obtained by use of accepted ballistic test methods. Piston tools of low velocity type shall be so designed that the piston or working element used at the time of discharge or firing remains captive in the tool.