Features High-speed steel taps provide good wear resistance in general purpose tapping applications in a range of materials. Thread Size / 3/8inch-18 Thread Standard / NPT Tap Material / High Speed Steel Tap Finish / Bright (Uncoated) Thread Length / 1 1/16 inch Overall Length / 2 9/16 inch 75% Thread Drill Size / 0.5625 inch Class of Fit / 3B Number of Flutes / 4 Primary Material Application / All Materials Thread Limit / Class of Fit / 3B Thread Direction / Right Hand Coolant Fed / Non-Coolant Through Drill Bit Size / 37/64 inch Features / For Use With a Wide Variety of Materials Flute Type / Straight Material Grade - Machining / M2 Measurement System / Fractional Inch Series / 311-60205 Shank Dia. / 3/4 in Shank Length / 1 1/2 inch Shank Type - Machining / Straight Square Size / 0.5150 inch Standards / ASME Tap Chamfer / Semi-Bottom Tap Grouping / Individual Tap Style / Pipe Tap Thread Size / 3/8inch-18 Threads per Inch / 18