Machine Screw Tap, National Course Thread, #12 x 24

#12 x 24, national course thread, machine screw tap, carbon steel, ideal for routine maintenance, repair work & for rethreading where high accuracy & 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, use drill bit #16 or 11/64".