Additional information
| Size | No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7, No. 8 |
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BORDO HSS Centre Drill
- Bright Finish HSS No.1 Centre Drill 118° / 60°
- Centre Drills are used with a lathe to centre drill stock for mounting in the lathe.
- They are designed to drill a small diameter pilot hole followed by a 60° countersink which provides a bearing surface for the 60° point of the lathe centre.
- Centre drills are also used extensively with milling machines to accurately start holes.
- The hole locations can be dialled in using the milling machine’s calibrated hand wheels.
- The hole is then started using the centre drill.
- The large diameter shank on the centre drill holds the drill point right on centre.
- Once the hole is started, the centre drill is replaced with a drill of the desired diameter and the finished hole is then drilled.
Related products
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Long Series HSSBORDO Long Series Black HSS Fractional
- 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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Extra Long HSSBORDO 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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Colour BandBORDO Blue Band HSS-Co TiAlN Stainless Steel Drilling Metric
- 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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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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