1. To cut an internal thread, at first a core hole is drilled, whose diameter is approximately smaller by the pitch of the thread than the nominal diameter of the thread.
2. Subsequently tapered counter bores are placed,which match the size of the thread diameterplus 10% of it. This is done to get a better insertion into the bore hole and to prevent the first and the last thread from being pushed out when beginning to cut.
3. Then the taps are screwed in and out in order.The final core hole diameter is created through the additional plastic deformation of the thread flanks.

Specification

The Spiral Point machine tap consists of cobalt alloyed and vaporised heavy duty high-speed steel. For through threads and bottoming threads in unalloyed and alloyed steels up to a strength of 1000 N/mm², staniless steel, malleable cast iron and non-ferrous metals. The thread is cut in
one operation.

Application:

1.high alloy steel
2.short-chipping material
3.short-chipping stainless steel
4.alloy tool steel
TiCN-coating
excellent wear resistance by improved hardness and thoughness
intensive and optimal cooling required because of lower heat resistance

The Features of this spiral point taps: plug chamfer and right hand thread cutting. 3 straight flutes are ground to provide downward chip removal.
High-speed steel tool (M35) is great for general purpose applications, offering high hardness and toughness. TICN coating for improving wear and fusion resistance, long service life
This kinds machine taps are great for through-hole threads. Can be used for drilling and tapping stainless steel (below 30HRC), aluminum, die steel, ordinary steel, non-ferrous metals, hard plastics, etc..

The packing of the machine taps:

we usually use plastic box packing the machine taps,if you need high quality,we also can purchase ROSE brand plastic box.