external threading tool / milling / for machine tools
Dormer Pramet



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    for machine tools


There are four primary tap geometries and tapping processes supported by Dormers threading range:

Straight Flute Taps: the most commonly used type of tap. Suitable for blind or though hole thread production in most materials, mainly steel and cast.

Spiral Point Taps: features a straight, fairly shallow flute and is also referred to as a gun nose or spiral point tap. The point is designed to drive the swarf forward, hence this type of tap is recommended for threading through holes.

Spiral Flute Taps: intended primarily for threading blind holes, the helical flute transports swarf back out of the hole, thus avoiding packing of swarf in the flutes or at the bottom of the hole.

Forming Taps: forming taps differ from cutting taps in that the thread is produced by deformation of the component material, rather than the traditional cutting action. This means that no swarf is produced and the resultant thread is stronger.

Dormer also offers a range of split (adjustable) and solid dies for the production of external screw threads.