Special Application Machine Taps or Ring Taps. The colour of the ring specifies the application. Theses Taps come in Spiral Point for through holes and Spiral Flute for blind holes.
Yellow Ring taps have been designed with special geometry for tapping in soft ductile aluminiums and long chipping light metals and plastics. Soft steels <450 N/mm*.
Orange Ring Taps are for most steels, especially where cold welding is a problem. For alloyed and unalloyed steels, 450-1000 N/mm*. Not listed as standard please enquire.
Red Ring Taps are designed to cut threads in High Resistant steels. For very tough materials over 1000 N/mm*.
Blue Ring Taps are designed for tough stainless steels and high alloyed tool steels which have a tendency to "close" after threading. For stainless steels.
Green Ring Taps are designed for tough non ferrous metals which have a tendency to "close" after threading. Eg Bronze or Alu with Si>10%. For tough non ferrous metals.
White Ring Taps have a modified rake angle. 15° lead and nitride surface treatment. For cast iron and other abrasive short chipping materials. Not listed as standard please enquire.
We are UK agents for FEW Cutting Tools South Africa with 100 years of manufacturing experience.
Should the size you require not be listed please enquire as all sizes can be sourced.