Internal thread-producing tool and method

An internal thread-producing tool, comprising a body having a rear shank portion and a front thread-forming portion, the body including a lubricant chamber disposed therein for storing liquid lubricant, the chamber including at least one lubricant discharge passage extending from the chamber to the thread-forming portion for discharging liquid lubricant, wherein the discharge passage has a diameter in the range of about 0.01 to 0.4 mm.

An internal thread-producing tool, comprising a body having a rear shank portion and a front thread-forming portion, the body including a lubricant chamber disposed therein for storing liquid lubricant, the chamber including at least one lubricant discharge passage extending from the chamber to the thread-forming portion for discharging liquid lubricant, wherein the chamber also extends to a rear end of the body, a rear end of the chamber being sealed by a closure.

An internal thread-producing tool, comprising a body having a rear shank portion and a front thread-forming portion, the body including a lubricant chamber disposed therein for storing liquid lubricant, the chamber including at least one lubricant discharge passage extending from the chamber to the thread-forming portion for discharging liquid lubricant, further including a plunger disposed in the chamber and being forwardly spring-biased to urge liquid forwardly toward the discharge passage.

An internal thread-producing tool, comprising a body having a rear shank portion and a front thread-forming portion, the body including a lubricant chamber disposed therein for storing liquid lubricant, the chamber including at least one lubricant discharge passage extending from the chamber to the thread-forming portion for discharging liquid lubricant, wherein the chamber extends along a center axis of the body, the chamber extends rearwardly from a front end of the body, a front end of the chamber being sealed by a closure, and the chamber also extends to a rear end of the body, a rear end of the chamber being sealed by a closure.