Split point is self centering reducing the need for end thrust.
The 135° point provides superior performance when drilling harder steel materials.
In most situations it will produce thicker chips minimising work hardening of the cavity.
Faster penetration reduces abrasion and friction along the cutting edges.
Black Finish Drills (also called blue finish) achieve their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating.
This surface helps to keep lubricant on the tool, particularly important on the cutting edges, thus reducing friction and cold welding.
The result is increased tool life.
Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.
Bordo Metric Yellow Band HSS Twist Drills for Aluminium and its alloys.
DIN338
130° web thinned point with two helical flutes with 35 degrees of helix angle.
The alloying elements which achieve varying Aluminium Alloys have an effect on the machining properties of these materials.
This generally creates a difficult long chip formation and material which has tendencies to stick to the tool, placing a unique set of demands on tooling. Yellow Band Series contends with these difficulties.
For machining materials with Hardness < 200 HB : Tensile Strength <700 N/mm2.
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Bordo Metric White Band HSS-Co TiAlN Coated Twist Drills for Cast Iron.
DIN338
118° / 70° DX point with two helical flutes with 33 degrees of helix angle.
A highly abrasive material with damping and thermal conductivity, high strength and resistance to wear. Cast Iron is used extensively for mass produced components.
The White Band Series is designed for this specific purpose. TiAlN coating increases tool surface hardness to 87Rc.
For machining materials with Hardness < 300 HB : Tensile Strength <10900 N/mm2.
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Chisel point is suitable for general purpose drilling.
Black Finish Twist Drills (also called blue finish) achieve their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating.
This surface helps to keep lubricant on the tool, particularly important on the cutting edges, thus reducing friction and cold welding. The result is increased tool life.
Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.
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This product has multiple variants. The options may be chosen on the product page
Bordo Metric Blue Band HSS-Co TiAlN Coated Twist Drills for Stainless Steel.
DIN338
Multi-faceted point with two helical flutes with 35 degrees of helix angle.
The machining of stainless steels is difficult due to its work hardening properties, toughness and poor thermal conductivity, which places high demands on the cutting tools.
The Blue Band – Stainless Steel – Series has been specifically designed to suit these difficult machining requirements.
TiAlN coating increases tool surface hardness to 87Rc.
For machining materials with Hardness < 350 HB : Tensile Strength <1250 N/mm2.
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This product has multiple variants. The options may be chosen on the product page