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Product Number: 2000-21/64 21/64" Black HSS Jobber

Product Attributes
Packaging   bulk
Diameter (mm)   8.33
Diameter (inch)   21/64
Flute Length (mm)   84
Overall Length (mm)   117
Pack Quantity   5
 
Technical Data
Spindle Speed Stainless Steel RPM   459
Spindle Speed Tool Steel RPM   688
Spindle Speed Cast Iron RPM   918
Spindle Speed Malleable Iron RPM   1032
Spindle Speed Med. Carbon Steel RPM   1147
Spindle Speed Free Cutting Steel RPM   1644
Spindle Speed Aluminium/Brass RPM   2332
Spindle Speed Wood/Plastic RPM   3479
Feed per revolution mm   0.17
 

9326518001867Bar Code No.
 

 Product Information
Black Finish Jobber Drills (also called blue finish) acheive their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating. This surface helps to keep lubricant on the tool, particularly important on the cutting edges, thus reducing friction and cold welding. The result is increased tool life. Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.


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