Description:

Straight Flute Tap Size: Thread size: 4-40 UNC; total length: 50mm / 1.97"; thread length: 16mm / 0.63"; square end width: 2.5mm / 0.10"; accuracy class: 2B. Straight flute design, downward chip removal. Right hand thread cutting, clear threads, fast tapping with accuracy.. High Speed Steel 6542: High-speed steel 6542 has high hardness, good wear resistance, is not easy to deform, and long service life. It has good heat resistance and can still maintain stability in high-temperature environments. The surface is nitrided and blackened, which is corrosion-resistant and not easy to rust even in a humid environment.. Wide Applications: The thread tap is suitable for drilling mild steels, aluminum, iron, copper, stainless steel, hard plastic, processing through holes or shallow holes. Add appropriate tapping oil for higher quality internal threads and more durable taps.. Easy to Use: Used on drilling machines, tapping machines, CNC and milling machines. Recommended feed rate: general steel: 6-15m/min; harder steel: 5-10m/min; stainless steel: 2-7m/min; cast iron: 8-10m/min..