Machinery's Handbook, 31st Edition
980
Taps
Tap Terms
Overall Length, L
Shank Length I
Thread Length I
Core Dia.
Flute Land Width
Driving Square Length
4
I
2
External Center
Truncated Center Optional
Transitional Optional with Manufacturer
BLANK Design 1
Overall Length, L
Shank Length I 4
Thread Length I
Neck Length I 1
Driving Square Length
I
2
External Center
Neck Diameter d
Truncated Neck to Shank Optional with Manufacturer
2
BLANK Design 2 with Optional Neck
Overall Length, L
Shank Length I
Thread Length I
Driving Square Length
4
I
2
Truncated Center Optional
External Center
Transitional Optional with Manufacturer
BLANK Design 2 (without Optional Neck)
Overall Length
Shank Length I
Thread Length I
Driving Square Length, I 2
Chamfer Length
4
Point Dia.
Size of Square across flats
I
5
d
3
90 °
Shank Dia. d
Internal Center
Chamfer Angle
1
Thread Lead Angle
BLANK Design 3
Fig. 4. Taps Terms Minor Diameter: On a straight thread, the minor diameter is that of the minor cylinder. On a taper thread, the minor diameter at a given position on the thread axis is that of the minor cone at that position. Neck: A section of reduced diameter between two adjacent portions of a tool. Pitch: The distance from any point on a screw thread to a corresponding point in the next thread, measured parallel to the axis and on the same side of the axis.
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