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Technical Information
Illustrations of Tap Terms
pitch
tap crest
basic crest
angle of thread
flank
min tap
major
diameter
max tap major
diameter
basic height of
thread
basic major
diameter
base of thread
basic root
basic pitch diameter
basic minor diameter
concentric margin
relief to cutting edge
cutting edge
eccentric relief
no relief
heel
cutting
face
Concentric
Eccen tric Relief
Con-Eccentric Relief
tap major diameter
basic minor diameter
Positive Hook
Negative Rake
Radial Rake
Positive Rake
Reprinted with permission from United States Cutting Tool Institute (USCTI). Published by Kennametal Inc. © 2014. All rights reserved.
Y88
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0º Hook
Negative Hook