Westward 2LXE8 Straight Flute Tap The highly polished finish of these taps adds a smooth, polished surface. Thread Size / 1/2 inch-13 Thread Standard / UNC Tap Chamfer / Taper Tap Material / Carbon Steel Tap Finish / Bright (Uncoated) Thread Length / 1-21/32 inch Overall Length / 3-3/8 inch Thread Direction / Right Hand Number of Flutes / 4 Coolant Fed / Non-Coolant Through Drill Bit Size / 27/64 inch Measurement System / Fractional Inch Primary Material Application / All Materials Shank Dia. / 23/64 inch Shank Type - Machining / Straight Square Size / 0.2750 inch Standards / ASME Tap Style / Straight Flute Threads per Inch / 13