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All Products  ➞ Bordo ➞ Drills ➞ Specialist ➞ Stub Drills ➞ Black Fractional HSS Bulk

7/16" HSS Black Stub Drill

Part Number:2020-7/16
Brand:Bordo
Barcode:9326518038023
Pack Qty:5
Diameter (inch):7/16
Diameter (mm):11.11
Flute Length (mm):52
Overall Length (mm):87

About this item:
  • 7/16" HSS Black Stub Drill
  • 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.
  • Black Finish Stub Drills (also called blue finish) achieve their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating.
  • Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.