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1 to 1-1/2 threads chamfered - used when threads must go to the bottom of a hole.Ideal for routine maintenance, repair work and for rethreading 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. High Carbon Steel Fractional Bottom Tap - 5/16" - 32 NEF
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