Helicoil Drill Chart |
![helicoil heli-coil](../images/helicoil_logo.gif) |
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The minimum drilling depths shown
below allow for the following
recommended practices: |
- Countersinking the drilled hole
to prevent a feather edge at the
start of the tapped hole.
- 3/4 - 1-1/2 pitch of insert "set down" to allow for
maximum production tolerance.
Dimensions are shown for both
plug and bottoming taps.
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![Helicoil-chart helicoil heli-coil](images/drill-chart.jpg) |
Helicoil Drilling Data - Metric |
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For plug Taps 5/16" or M8 and smaller. F is equal to the insert
nominal length (Q) + ½ the nominal
bolt diameter + 5 Pitch (allowing
for tap chamfer, countersink and
maximum “set-down”).
For Plug Taps 3/8" or M10 and larger F is equal to the insert nominal
length (Q) + 5 Pitch (allowing for tap
chamfer, counter sink and maximum
“set-down”).
For bottoming Taps. F is equal to
the insert nominal length (Q) + 3
Pitch (allowing for tap chamfer,
countersink and maximum
“set-down”). |
![Helicoil-Drill-chart helicoil heli-coil](images/drill.jpg) |
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![Helicoil-Chart Metric Drilled Hole dimensions helicoil heli-coil](images/drill-chart2.jpg) |
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