BORDO 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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BORDO 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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Bordo Metric Cobalt Tough HSS-Co5 Twist Drills.
DIN338
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.
The 135° point should be used to cut harder steel materials especially in deep hole applications.
In these situations it will produce thicker chips minimising work hardening of the cavity.
Faster penetration reduces abrasion and friction along the cutting edges.
Cobalt HSS Twist drills are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile steel.
Bronze Finish (gold oxide) surface treatment. The metallic brown coloured low temperature temper treatment is normally only used on cobalt tools for identification purposes.

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Bordo Fractional Cobalt Tough HSS-Co5 Twist Drills.
ANSI B94-11
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.
The 135° point should be used to cut harder steel materials especially in deep hole applications.
In these situations it will produce thicker chips minimising work hardening of the cavity.
Faster penetration reduces abrasion and friction along the cutting edges.
Cobalt HSS Twist drills are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile steel.
Bronze Finish (gold oxide) surface treatment. The metallic brown coloured low temperature temper treatment is normally only used on cobalt tools for identification purposes.

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