Machine Taps DIN 376 HSS-E ( Co5 ) - a closed hole ( C ) 35°
Description:
The machine tap drill is manufactured from cobalt HSS steel. It is temperature resistant, which extends its lifespan. It is used for tapping threads in open and closed holes, in alloyed and non-alloyed steels up to a hardness of 1000 N/mm², and non-ferrous materials. The incision is made in one operation. Like HSS high speed steel, with cobalt alloy. This temperature-stable material is used for processing materials with high strength and for long cutting channels with correspondingly strong heating. The proportion of cobalt is 5% and ensures greater heat resistance and greater load capacity. HSS HSSE-Co 5 HSSE.
Application:
- To cut the internal thread, first drill a core hole whose diameter is approximately one step smaller than the nominal diameter of the thread.
- Taper holes are then made 10% larger than the thread diameter to provide better feed into the bore when tapping and to prevent the first and last thread notches from being pushed outward.
- Then the taps are twisted and unscrewed in turn.
- The final diameter of the thread core is created by additional plastic shaping of the thread flanks.
- For a longer service life of the tools and optimal surface quality, cutting oils or other cooling lubricants are used for lubrication, because they reduce the friction between the chips and the blades of the screw drill, and thus also the necessary torque.
- With manual taps, after two turns, the drill must be turned back a third of a turn to break off the chip. This reduces the load on the drill bit, which therefore does not break as quickly.
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