BORDO Extra Long Series Bright HSS Metric

HSS Extra Long Twist Drill
135° Split Point (crankshaft point).
Split point is self centering and the short distance from the drill axis to the outer corners results in faster penetration, reducing the need for end thrust.
Bright Finish Twist Drills have no surface treatment and are supplied in the as-ground condition. These tools are suitable for general purpose use, particularly for non-ferrous applications.

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BORDO Stub Drills Black HSS Fractional

Stub drills (screw machine twist drills) have a shorter overall length than Twist drills for maximum rigidity and longer tool life.
135° Split Point (crankshaft point).
Split point is self centering and the short distance from the drill axis to the outer corners results in faster penetration, reducing the need for end thrust.
They are designed primarily for machining operations in lathes (screw machines) but can also be used in manual hand held drills.
Bordo Stub Drills have two helical flutes with 30 degrees of helix angle. This provides fast chip ejection and very stable drilling operation.
Black Finish Stub Drills (also called blue finish) achieve their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating.
Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.

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HSS-Co5 (Cobalt) Extra Deep Hole Drills
DIN1869
HSS-Co5 (Cobalt), 130° UX Point, 40° Helix Parabolic.
Cobalt HSS drills are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile steel.

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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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