Page 232 - Fanar

i Technical Information

4. TAPS

4.1. Tap construction elements (on example of DIN-371)

D1 D3 D2
B C A A-A

D4
a

L5
L4
L2
L3
L1

B C
A

r B-B C-C
Ɣ
Ɣ
S2
S1

D5
t
m m
Ɣ 1

α
K P
x

m

D4
Ɣ 2

L1 - total length S1 - relief of chamfer
L2 - thread length S2 - relief of thread
L3 - useful length P - pitch of thread
L4 - length of driving square - angle of thread
L5 - chamfer length - rake angle
a - size of square - spiral point angle
d1 - thread diameter - angle of spiral flutes
d2 - shank diameter - chamfer angle
d3 - neck diameter r x - straight flute
- (chamfer) point diameter
- spiral flute
11 d4 - web (core) diameter t - spiral point
d5
m - width of land z - number of lands

228