Threading by color


Dormer Pramet’s range of taps for material specific applications - branded Shark Line – provide an extremely competitive threading option.

​​​Marketed under the Dormer product brand, all our Shark Taps feature a coloured ring that signifies the specific material type it is suited to.

The program encompasses spiral point taps for through-hole applications, spiral flute taps for threading blind holes and, in the case of white ring taps for cast iron, straight flute taps for both through or blind holes.

Shark Line taps are manufactured from a powder metallurgy material. This offers improved toughness and tool life compared to High Speed Steels. These improved characteristics mean the taps have a more predictable and assured life.

The geometry ensures the production of good threads at both high and low cutting speeds. Furthermore, it prevents unnecessary built up edge and wear on the cutting edges to ensure longer tool life. 

In addition, it provides a quality thread surface finish. The different geometries for blind and through holes have been optimised to ensure process security.

Yellow Shark is designed for threading low alloy steels, and is available with an electroplated Hard Chrome finish up to 5 micron thick to prevent edge build-up in materials prone to sticking to the cutting edges. The flute geometry has been designed to prevent swarf nesting, reducing the risk of re-cutting swarf on reversal.

Red Shark is designed for high performance thread production in alloy steels and is available in Bright finish or with TiAlN-Top coating for increased protection against abrasive wear and erosion. When combined with edge preparation it guarantees exceptional performance in alloy steels. The spiral flute version features back taper design to diminish chipping on the last few threads of the tap and reduce the torque required to reverse the tool.

The production of threads in a wide range of stainless steels is achieved with Blue Shark. Available with Steam Temper or Super-B (a hard lube coating that prevents chips adhering to the flutes) coatings with specific edge preparation these taps provide extended tool life in even the most difficult stainless steels.

The White Shark has been developed specifically for cast iron and other short chipping materials. Available with the Steam Temper or TiAlN coating options it features a straight flute design which enables production of both through and blind holes.

Green Shark is the final material specific thread cutting option currently offered by Dormer, and it has been developed for non-ferrous materials with a Bright or TiAlN-Top finish to provide long service life in aluminium and its alloys, brass and copper.

For more information download our Shark Line brochure or contact your local Dormer Pramet sales office.