IRWIN® Machine Screw Taps (HCS), 6-48 NS, Chamfer - 1 1/2 Threads (585-1221) EachIdeal for routine maintenance, repair work and for re threading where high accuracy and tolerance thread is not critical Straight flutes are ground to provide rapid chip removal for efficient threading Designed for hand threading work in a variety of materials Taps produce a class 2B thread 1 to 1 1 2 threads chamfered used when threads must go to bottom of hole Thread Size = 6 Threads Per Inch = 48 Thread Standard = NS No. of Flutes = 3 Outside