HSS 1/8in (3.18mm) Jobber Drill Bit - Black Series (10PK)


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Alpha Black Series 1/8 inch Jobber Drill Bit (10 per pack)


  • Tempered black oxide finish reduces friction between bit and workpiece
  • 118� split point for precision hole starting
  • Fully ground premium quality M2 HSS
  • Corrosion resistant finish
  • Ideal for drilling hard metals (coolant recommended)
  • Not recommended for soft materials or non-ferrous metals
  • Available in common metric, imperial and panel/stub sizes.


Overall Length 70mm
Flute Length 42mm
Stainless Steel RPM 1274
Tool Steel RPM 1911
Cast Iron RPM 2548
Malleable Iron RPM 2866
Medium Carbon Steel RPM 3185
Free Cutting Steel RPM 4564
Alum, Brass, Plastic RPM 6476
Wood RPM 9660
Feed per RPM (mm / rev) .05-.15
Standard pack Qty 10


The flute form, web thickness and split point of the standard Alpha drills are suitable for most materials forming fine chips. For effective drilling, the rigidity of the drilland work piece are most important. The shorter the flute length the more rigid the drill. Long drills must be adequately supported to reduce vibration.

The following are important in drill use :

  • Clamp the work piece securely
  • Select the correct speed and feed
  • Use an appropriate coolant or lubricant
  • Ensure the shank is securely held. Aviod using worn drill chucks as the drill may slip during use.
  • Regrind the point or replace the drill before it dulls, do not force a worn drill.
  • When deep hole drilling, withdraw frequently to clear the chips ( deep holes start at 4X the diameter)
  • For stainless steel, manganese and high tensile steels, do not allow the drill to swell as it will cause work-hardening. Use a slower speed and heavier feed for these materials.

QTY: 10 per pack


SKU 005-0153
Brand Alpha
Shipping Weight 0.0100kg
Shipping Width 0.050m
Shipping Height 0.010m
Shipping Length 0.010m

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