
E High speed steel Nitriding/Oxidizing Cutting length
Nitride Oxide
High speed steel Coating Coated Spiral pointed tap
through hole use
High speed steel For blind hole with Hand tap
(Cobalt HSS) through coolant hole
Powder HSS For through hole with Spiral fluted tap
radial coolant hole through hole use
Ultra micro grain For left hand thread Spiral fluted tap
cemented carbide blind hole use Left hand Low spiral
Alloy steel For synchronized fluted tap
feeding blind hole use Low spiral fluted tap
Tool Number of threads blind hole use
Tool steel
steel on chamfer specially for horizontal
tapping Front face Number of threads Carbon steel and low alloy steel Specification
Oxidizing on chamfer IS P Tapping Speeds
Oxide (for Round Die) (m/min) Center drills Nitriding left hand cut Nitride
COLOUR RINGS
YELLOW for sticky and soft steel ≤500N/mm2
BLUE (VA) for stainless steel and general steel
RED for hard steel 30~45 HRC
WHITE for cast iron
ORANGE for nickel base alloy, alloy steel (CrMo, NiCrMo) and stainless steel (V4A)
PINK for titanium alloy, alloy steel (CrMo, NiCrMo) ≥950N/mm2
GREEN for aluminium casting and diecasting (Si≤12%)