HAHN CAT 0207 (VG):HAHN CAT 0207

Terms on Taps HAHNREITER HSS-E
Roll tap without oil grooves Roll tap with oil grooves
A
5°
B
8°
C
15°
D
8°
E
23°
Thread profile
of tap
Chamfer Forms on Taps
6 - 8
3,5 - 5,5
2 - 3
3,5 - 5,5
1,5 - 2
Chamfer-Ø (d 3) (Tol. h13) = D 1 (min.) - 0,05 P
d nominal-Ø of thread
d3 chamfer-Ø
I5 length of chamfer
K number of polygons
N number of oil grooves
p pitch
α included angle of thread
α/2 1/2 included angle of
thread
R radius at minor-Ø of
thread
d major-Ø
d2 pitch-Ø
d1 minor-Ø
Bk width of core of thread
lead angle = arc tan -1 (p / (d2 · π))
DIN 2197 Number Shape Main
chamfer form of of application
angle ≈ threads flutes for
straight flutes short through holes
Calculation of other chamfer angles: Tan χr = Outside-Ø (dA ) - Chamfer-Ø (d3 )
Length of Chamfer (I5 )· 2
straight flutes with through holes being cut in
spiral point medium to long chipping material
straight or helical blind holes and through holes in
flutes short chipping materials
straight or helical blind holes with long thread
flutes run out or through holes
straight or helical blind holes with extremely short
flutes thread run-out
Chamfer-Ø always has to be produced below min. value of minor diameter of the thread that is to be produced.
For those applications where the design standards do not specify the chamfer-Ø we recommend the following formula:
D 1= Min. minor-Ø of thread
d A= outside-Ø of tap
UK +44 (0)1376 347566 Email: enquiries@fenntool.co.uk Website: www.fenntool.com Ireland +353 (0)45 877740 63