Straight Flute Taps Flute Count 4 7/16-14 UNC 4 Flute H3 HSS (M4) CNC For Cast Iron & Harder Materials Straight Flute Tap- Steam Oxide over Nitride Cleveland List CI1000 Straight Flute for Cast Iron and Harder Materials Threads per Inch 14 Thread Cutting Part Length 7/8 inch Overall Length 3.156 inch Thread Diameter Size 7/16 inch Cleveland