OSG USA, Inc. TP491301502601 1/2-13-2B-4FL-HSSE-Steam Oxide-Modified Bottoming-Spiral Flute TapFull Description Thread Diameter Size (TDZ) 1/2" Tool Type High Performance Tap Threads per Inch (TPI) 13 Chamfer 2.5P-3P Thread Standard NC Coating Black Oxide Overall Length (OAL) 110 mm Flute Type Spiral T