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Is there a difference between 90-degree internal chamfering and 120-degree internal chamfering for drilling and tapping products?
Generally speaking, there is no strict requirement on the angle of the hole bottom for tapping, which can be 90 degrees, 120 degrees, or any angle between them.
In some cases, there may be some requirements, such as limited drilling depth, but deep tapping depth. At this time, the angle of drilling bottom should not be too sharp to reduce the hole depth.
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