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All Products ➞ Bordo ➞ Drills ➞ Specialist ➞ Stub Drills ➞ Black Fractional HSS Bulk
19/64" HSS Black Stub Drill
Part Number: | 2020-19/64 |
Brand: | Bordo |
Barcode: | 9326518037934 |
Pack Qty: | 5 |
Diameter (inch): | 19/64 |
Diameter (mm): | 7.54 |
Flute Length (mm): | 40 |
Overall Length (mm): | 70 |
About this item:
- 19/64" 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.