KINCROME 5 Piece HSS Drill Bit Set – Metric
Contents
Sizes: 4.0, 5.0, 6.0, 8.0, 10mm
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Bright Finish HSSBORDO Wire Gauge Bright Finish HSS Jobber Drill Set
- Bordo Wire Gauge Quick Silver M2-HSS Twist Drills.
- 118° Split Point (crankshaft point).
- Split point is self centering and reduces the need for end thrust. Friction at workpiece is reduced.
- 118° point angles are ideal for use in materials such as mild steel and cast iron.
- The 118° point creates easily controlled chips which are wide and thin.
- 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.
- Gauge size drill calculations are generally made utilising a reference book or table.
- For example, to drill a hole which is 10 thou (thousandth of an inch = .001) bigger than a 1/8? bolt, the user must first work out that 1/8? is 125 thou, so the required hole size is 135 thou. Using a reference table establishes that you would need a number 29.
- Number drill bit gauge sizes are analogous to, but different from, American wire gauge.
- Number gauge is most commonly used from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest).
- Number gauge is actually defined down to size 97, but these smallest sizes are very rarely used.
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Metal DrillingKINCROME 3 Piece Spiral Step Drill Set
Contents
- K21830 4-12mm Spiral Step Drill
- K21831 4-20mm Spiral Step Drill
- K21832 4-30mm Spiral Step Drill
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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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