Additional information
| Size | No. 30 (3.26mm), No. 20 (4.09mm), No. 11 (4.85mm) |
|---|
BORDO Stub Drills Bright HSS Metric
- 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.
- 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.
Related products
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Long Series HSSBORDO Long Series Black HSS Metric
- ANSI B94-11
- 118° chisel point with 30° helix.
- 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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Colour BandBORDO Yellow Band HSS Aluminium Drilling
- 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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Colour BandBORDO Red Band HSS-Co TiAlN Tough Treatable Steel Drilling
- Bordo Metric Red Band HSS-Co TiAlN Coated Twist Drills for Tough Treatable Steel.
- DIN338
- 130° UX point with two helical parabolic flutes with 33 degrees of helix angle.
- 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 – Tough Treatable Steel – Series.
- TiAlN coating increases tool surface hardness to 87Rc.
- For machining materials with Hardness < 470 HB : Tensile Strength <1500 N/mm2.
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Colour BandBORDO White Band HSS-Co TiAlN Cast Iron Drilling
- 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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