Colour Band Range

Somta Colour Band Application range of drills and taps is specially designed to optimize your machining performances.

The need for greater productivity from expensive high-performance machine tools and the demand for the cutting tools to perform at optimum efficiency to minimize machine down-time, together with the demands for improved quality of machined components can be met with this range of Colour Band cutting tools.

The geometry has been specifically designed for each material group to improve quality of finish and increase the tool performance.

Product Types:

The CBA family consists of five "Colour Band Application" ranges of drill and tap combinations. Each range has been designed with different cutting geometries and surface treatments to ensure optimum tool performance for each specific material category.

Each range of materials group has its own drill and tap combination, and taps are available in both Spiral Point and Spiral Flute to suit the individual requirement.

BLUE BAND Tap Characteristics
• Thread and flute configuration designed for tough materials, such as Stainless Steel, Titanium Alloys, Cast Steel,
  Heat Resisting Steel and Work Hardening Steel.
• HSSE - Vanadium content for toughness
• Truncated Thread - Truncated thread after lead reduces frictional contact with the threaded hole and allows
  easier penetration of coolant.

BLUE BAND Characteristics (For both Tap and Drill)
• Material Properties - Used to tap materials with hardness up to 350HB, tensile strength up to 1250N/mm².
• Surface Finish - TiAIN coating increases surface hardness of the tool to around 87Rc with an excellent hot
  hardness working temperature and high oxidation temperature making it suitable for dry machining.

BLUE BAND Drill Characteristics
• Flute - Refined flute profile with high helix for enhanced chip removal.
• Point - Specifically developed MULTIFACET POINT for higher load carrying capacity and enhancing feed rates in
  the machining of difficult materials.

The mechanical properties of materials are influenced diversely by the addition of alloying elements and heat treatment processes, resulting in some high-strength, quenched and tempered steels or hardened steels. This range has its own unique set of machining requirements which are satisfied by the red band range of drills and taps.

RED BAND Tap Characteristics
• HSSE - Vanadium content for toughness
• Thread and flute configuration designed for high tensile materials such as Tool Steels, Heat Treatable Steels,
  Spring Steel, Case Hardening Steel, Unalloyed Titanium, Nitriding Steel, Cold Drawn Constructional Steel and
  High Tensile Steel.

RED BAND Characteristics (For both Tap and Drill)
• Material Properties - Used to machine materials with hardness up to 470HB, tensile strength up to 1500N/mm².
• Surface Finish - TiAIN coating increases surface hardness of the tool to around 87Rc with an excellent hot
  hardness working temperature and high oxidation temperature making it suitable for dry machining.

RED BAND Drill Characteristics
• Flute - Slow helix, parabolic flute designed with reinforced web for high rigidity under extreme conditions
• Point - The 130° special notched "UX" point style provides self centering, easier penetration, improved hole accuracy and
  improved load distribution. This special notch geometry gives a corrected rake angle of 15° which provides a strong point for
  harder materials, as well as preventing snatching with materials such as Aluminium, Brass, Bronze and Plastics.

RED BAND General Machining Guide

The alloying elements which achieve varying Aluminium Alloys have an effect on the machining properties of these materials. This generally creates a difficult chip formation and material which has tendencies to stick to the tool, placing very different demands on the tool. The yellow band contends with these machining difficulties.

YELLOW BAND Tap Characteristics
• Flute and Thread designed for more ductile materials such as Aluminium, Magnesium Alloys, Soft Brass (MS58),
  Plastic, Zinc Alloys and Copper.
• Flutes - Wide flutes allow more efficient swarf removal which prevents clogging and torque build-up.
• Rake Angle - High rake angle improves shear characteristics and reduces build-up on the cutting edge, allowing
  tap to cut more freely for longer periods.

YELLOW BAND Characteristics (For both Tap and Drill)
• Material Properties - Used to tap materials with hardness up to 200HB, tensile strength up to 700N/mm².
• Surface Finish - Bright as ground condition which is the most suitable finish for this ductile range of products.

YELLOW BAND Drill Characteristics
• Flute - 35° helix, open profile designed for efficient swarf evacuation.
• Point - The notched point reduces end thrust and optimizes centre cutting efficiency with chisel strength.

YELLOW BAND General Machining Guide

WHITE BAND Tap Characteristics
• Material Types - Designed for highly abrasive materials such as Cast Iron and reinforced plastics.
• Flutes - Increased number of flutes reduces torque and increases tap life.

WHITE BAND Characteristics (For both Tap and Drill)
• Material Properties - Used to tap materials with hardness up to 300HB, tensile strength up to 1000N/mm².
• Surface Finish - TiAIN coating increases the surface hardness of the tool to around 87Rc with an excellent hot hardness working
  temperature and high oxidation temperature making it suitable for dry machining.

WHITE BAND Drill Characteristics
• Flute - Slow helix, parabolic flute designed with reinforced web for high rigidity under extreme conditions.
• Point - The double angled "DX" point, 118° / 70° minimizes wear on the outer corners of the drill point in highly abrasive materials such
  as Cast Iron and Reinforced Plastics. The point is web thinned for easier penetration.

The machinability of different steels is just as varied as their properties. Soft-tough construction steels place completely different demands on the tools, and the green band combination of taps and drills has been perfected for this range of steels.

GREEN BAND Tap Characteristics
• HSSE - Vanadium content for toughness
• Thread and flute configuration design for free cutting and structural steels in the general purpose range of
  medium tensile strengths.

GREEN BAND Characteristics (For both Tap and Drill)
• Material Properties - Used to machine materials with hardness up to 250HB, tensile strength up
  900N/mm².
• Surface Finish - TiN Coating increases surface materials with hardness to 85Rc, with excellent resistance
  to abrasion and cold welding.

GREEN BAND Drill Characteristics
• Flute - 33° helix, open profile designed with reinforced web for high rigidity under extreme conditions.
• Point - The 130° SPLIT POINT provides self centering and easier penetration.