Machinery's Handbook, 31st Edition
970 Taps steel ground thread, and to cut thread in machine screw and fractional sizes with plug, semibottom, and bottom chamfer.
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Blank Design 2
Blank Design 3 Spiral-Pointed-Only Taps: These taps are made with the spiral point feature only, without longitudinal flutes. These taps are especially suitable for tapping thin materials. This standard applies to machine screw and fractional sizes in high-speed steel, ground thread, with plug chamfer.
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Blank Design 2
Blank Design 3 Spiral-Fluted Taps: These taps have right-hand helical flutes with a helix angle of 25 to 35 degrees. These features are designed to help draw chips from the hole or to bridge a keyway. This standard applies to machine screw, fractional, metric, and STI sizes in high- speed steel and to ground thread with plug, semibottom, and bottom chamfer.
Blank Design 2
Blank Design 1
Blank Design 3 Fast Spiral-Fluted Taps: These taps are similar to spiral-fluted taps, except the helix angle is from 45 to 60 degrees.This standard applies to machine screw, fractional, metric, and STI sizes in high-speed steel with plug, semibottom, and bottom chamfer.
Blank Design 1
Blank Design 2 Blank Design 3 Thread-Forming Taps: These taps are fluteless except as optionally designed with one or more lubricating grooves. The thread form on the tap is lobed, so that there are a finite number of points contacting the work thread form. The tap does not cut, but forms the thread by extrusion. This standard applies to machine screw, fractional, and metric sizes, in high-speed steel, ground thread form, with plug, semibottom, and bottom entry taper.
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