Page 624 - Yamawa_European_Catalogue_YEU23

1. Terminology of Taps

Intro

SP Flute Width of land Chamfer angle

SL

External center
Usable length (LU)
Core diameter Internal center Neck diameter (DN) Shank diameter (DCON) Size of square (K -DRVS)
PO
Length of square (LK)
Chamfer length (THCHT) Thread length (THL) Shank length (LS)
Functional length (LF)
ST

Chamfer relief Threads relief and cutting angle
ROLL Width of margin

Chamfer relief
Thread relief
CARBIDE Heel
Indicator drop
Indicator drop for Chamfer relief
for Chamfer relief
LONG

Cutting face Cutting angle
HAND
TAPS Edge angle, including chamfer relief, thread relief, cutting angle and others, as well as heat treatment, have important functions affecting
workpiece shape, tool life, surface finish of internal screw thread, and so on.

EG (STI) Chamfer of straight fluted taps

DIN Hand Set Series V(5P) M(3.5P) F(2P)
F
SPECIAL M
THREADS, V
GAUGES

THREAD Serial taps come in sets of three (DIN352, DIN351) or two (DIN2181, DIN5157) to complete screw threads by cutting work materials in
MILLS incremental steps. The first tap (V) and the second tap (M) cut screw threads under size.
Then, the third tap (F) completes the screw threads.

Straight fluted taps Taper tap threads
DIES Plug tap threads
Bottoming
tap Plug tap Taper tap Bottoming tap threads

CENTER
DRILLS

In general, tap chamfer is the most important part of taps to create internal thread. The function of full thread part of taps is to make a
Technical guidance.
info

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