ABN Large Tap and Die Set Metric Tap and Die Kit Rethreading Tool Kit Thread Maker Hole Threader 110-Piece Set, Metric

Product Information

To threads to the bottom of a blind hole, the machinist follows the taper tap with an intermediate (plug) tap, and then a bottoming tap to finish. Keeping the tap as perpendicular to the face of the metal as possible, and exerting some downward pressure, start turning the tap slowly clockwise. This feature causes the tap to continuously break the chip and eject it forward into the hole, preventing crowding. Bronze Kerosene or mineral spirits mixed with a small amount (10–15 percent) of petroleum-based cutting oil. For a long time this seemed to me like an esoteric and scary task, but when I had to do it, I discovered that it is not difficult at all.

Proper lubrication is essential because of the frictional forces involved, therefore a lubricating oil is used instead of cutting oil. This feature gives the taper tap a very gradual cutting action that is less aggressive than that of the plug tap.

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After you finish tapping the hole, remove the tap and clean out the chips from both the tap and your material.Their full length cutting shape allow for threads to be cut at the very bottom of a hole for maximum thread length. Spiral flute taps – for blind hole applicationsSpiral point taps – push chips forward, ideal for through-hole applicationsStraight flute taps – most commonly, designed for short chipping materialsForming taps – compresses to produce a thread rather than cuttingTaps come in both Metric and Imperial dimensions and can have different shank types. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average.