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Blind hole taps
Right-hand helix from 35° to 45°: the chip flows back towards the shank and the bottom of the hole stays clean. Short chamfer to thread all the way down.
35° right-hand spiral flute tap for blind holes in structural and annealed steels: the chip flows back towards the shank. TiN, 12 – 15° rake.
40° right-hand spiral flute tap for blind holes in quenched and tempered and alloy steels: the chip flows back towards the shank. TiCN, 10 – 12° rake.
35° – 40° right-hand spiral flute tap for blind holes in stainless steels: the chip flows back towards the shank. Steam oxide, 8 – 10° rake.
45° right-hand spiral flute tap for blind holes in aluminium and light alloys: the chip flows back towards the shank. Bright, 20 – 25° rake.
Straight flute tap for cast irons and short-chipping materials, in through and blind holes. Broken chips, TiCN against abrasion.
Blind hole taps
In blind holes the chip must come out upwards: this is why the tap has right-hand spiral flutes, from 35° for structural steels up to 45° for aluminium, which carry the chip out of the hole without jamming.
Versions are available for structural steels, hardened and tool steels, stainless steel and aluminium, plus the tap for cast iron.
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Inserts and cutting tools for CNC machine shops. Dedicated grades for every ISO group, from steel to aluminium, from superalloys to hardened steels, with cutting data in every product sheet.
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