Page 1920 - Master Catalog 2017, Inch

Technical Information
Tap Chamfers

„ Tap Chamfers • ANSI Taps

Taper Chamfer Plug Chamfer Modified Bottoming Chamfer Full Bottoming Chamfer
7–10 Pitches 3–5 Pitches 2–2.5 Pitches 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 The most common chamfer This short chamfer enables For threading close to the
longest standard chamfer for use by hand or machine threading close to the bottom bottom of blind holes, the
ensuring easier starting. It in through or blind holes. This of blind holes. Due to the slightly bottoming chamfer is the
requires less tapping torque chamfer is more efficient longer chamfer and more working least efficient chamfer
because of more working teeth. than a bottoming or modified teeth, this chamfer is more efficient available.
bottoming chamfer. than a bottoming chamfer.

„ Tap Chamfers • DIN Taps

Taper Chamfer Plug Chamfer Modified Bottoming Chamfer Full Bottoming Chamfer
7–10 Pitches 3–5 Pitches 2–2.5 Pitches 1–2 Pitches

Hand Tap Chamfers

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
The most common chamfers
For threading close to the
This short chamfer enables
Technical Information ensuring easier starting. It through or blind holes. Form B blind holes. Due to the slightly Form E chamfer is the least
threading close to the bottom of
bottom of blind holes, the
for use by hand or machine in
longest standard chamfer
applies to spiral-point taps and
longer chamfer and more working
requires less tapping torque
efficient chamfer available.
because of more working teeth.
Form D applies to straight-flute
teeth, this chamfer is more
efficient than a Form E chamfer.
and spiral-flute taps. This chamfer
is more efficient than Form E or
Form C chamfers.

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