Technical Information
Tap Chamfers
Tap Chamfers • ANSI Taps
Taper Chamfer
7–10 Pitches
Plug Chamfer
3–5 Pitches
Modified Bottoming Chamfer
2–2.5 Pitches
Full Bottoming Chamfer
1–2 Pitches
Tap Chamfers
Taper (7–10 pitches) Plug (3–5 pitches) Semi-Bottom (2–2.5 pitches) Bottoming (1–2 pitches)
The taper chamfer has the
longest standard chamfer
ensuring easier starting. It
requires less tapping torque
because of more working teeth. The most common chamfer
for use by hand or machine
in through or blind holes. This
chamfer is more efficient
than a bottoming or modified
bottoming chamfer. This short chamfer enables
threading close to the bottom
of blind holes. Due to the slightly
longer chamfer and more
working teeth, this chamfer is
more efficient than a bottoming
chamfer. For threading close to the
bottom of blind holes, the
bottoming chamfer is the
least efficient chamfer
available.
Tap Chamfers • DIN Taps
Taper Chamfer
7–10 Pitches
Plug Chamfer
3–5 Pitches
Modified Bottoming Chamfer
2–2.5 Pitches
Full Bottoming Chamfer
1–2 Pitches
Form A (6–8 pitches) Form B/D (3.5–5 pitches) Form C (2–2.5 pitches) Form E (1.5–2 pitches)
The Form A chamfer has the
longest standard chamfer
ensuring easier starting. It
requires less tapping torque
because of more working teeth. The most common chamfers
for use by hand or machine in
through or blind holes. Form B
applies to spiral-point taps and
Form D applies to straight-flute
and spiral-flute taps. This chamfer
is more efficient than Form E or
Form C chamfer. This short chamfer enables
threading close to the bottom
of blind holes. Due to the slightly
longer chamfer and more working
teeth, this chamfer is more
efficient than a Form E chamfer. For threading close to the
bottom of blind holes, the
Form E chamfer is the least
efficient chamfer available.
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Y89
Hand Tap Chamfers