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Idiomas disponibles
TAPPing
the tap must be adjusted on the prepared boring in the workpiece. Put down spindle, until the tap
touches the surface and the process can be started. Please comply with below chart for metric ISO thread.
BORE hOLE chART
mETRic iSO-ThREAd
Dimension
M3
M4
M5
M6
M8
M10
M12
M14
M16
M18
M20
Tips for the production of threads
1. clearance hole
We recommend adjacent tap drills for the
clearance holes which convey the chips out
of the borehole in the cutting direction. The
special polished section also allows a reliable
re-threading when the tap drill is withdrawn
from the tapped hole and moves back in an
anticlockwise direction.
2. Blind holes
We recommend adjacent tap drills for blind
holes. The chips are guided out of the borehole
against
the direction of the cutting. It is particularly
important to ensure that the tap drill does not run
aground, because otherwise the automatic return
can no longer be activated. A correspondingly
large pre-borehole depth must be planned.
If this is not done, the tap drill must be loosened
manually.
3. Blind holes up to 1.5 x d
For this, our tap drills are suited to according
to the adjacent figure. Also here, the chips are
conveyed away out of the borehole against the
cutting direction. Also here, it must be ensured
that the tap drill does not run aground. A
correspondingly large pre-borehole depth must
be taken into account.
If this is not done, the tap drill must be loosened
manually.
Beside our tap drills with a reinforced shank,
tap drills with a reduced shaft according to din 376
can, of course, also be used.
Please work with sufficient coolant that is
recommended by the manufacturer for tapping.
20
Thread Pitch
drill-Ø
0,5
2,5
0,7
3,3
0,8
4,2
1
5
1,25
6,8
1,5
8,5
1,75
10,2
2
12
2
14
2,5
15,5
2,5
17,5
mETRic FinE ThREAd
Thread Pitch
Dimension
M8x1
M10x1
M12x1
M12x1,5
M14x1
M14x1,5
M16x1
M16x1,5
M20x1
M20x1,5
Chip ejection downward through the hole
Chip ejection along the tool
Chip ejection along the tool
drill-Ø
1
7
1
9
1
11
1,5
10,5
1
13
1,5
12,5
1
15
1,5
14,5
1
19
1,5
18,5
DIN 371 with a reinforced
shank form B, with spiral
point, 3.5 to 5 pitches
DIN 376 with a reduced
shaft, thread depth 3 x D
DIN 371 with reinforced
shank with a spiral groove,
approx. 35° right-hand
twist bevel C, approx. 3
pitches
DIN 376 with reduced shaft
Thread depth 2.5 x D
DIN 371 with reinforced
shank with a spiral groove,
approx. 17° right-hand
twist, bevel C,
approx. 2 to 3 pitches
DIN 376 with reduced shaft
Thread depth 1.5 x D
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