Technical Information Tap Terminology
overall length
Tap Definitions
length of shank
length of
square
threaded length
chamfer
pitch
lead length
lead angle
square size
shank
diameter
minor
diameter
root
pitch
diameter
major
diameter
crest
front flank
rear flank
included angle of thread
semi-angle of thread
width of land
shear angle
cutting face
web diameter
Gun nose (spiral point)
flute
concentric land
Section A-A
Concentric threads
(no radial relief)
Cutting Faces
radial relief
radial relief
Eccentric threads
(relieved to cutting edge)
Con-eccentric threads
(relieved to a land)
land
tangential hook
chordal hook
angle
heel
negative rake angle
Negative rake
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Thread Relief Types
positive rake angle
Radial rake
Positive rake
Hook
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