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Product Number: 2003-4.20 4.2 mm Black HSS Jobber

Product Attributes
Packaging   bulk
Diameter (mm)   4.20
Flute Length (mm)   43
Overall Length (mm)   75
Pack Quantity   10
 
Technical Data
Spindle Speed Stainless Steel RPM   910
Spindle Speed Tool Steel RPM   1365
Spindle Speed Cast Iron RPM   1820
Spindle Speed Malleable Iron RPM   2048
Spindle Speed Med. Carbon Steel RPM   2275
Spindle Speed Free Cutting Steel RPM   3261
Spindle Speed Aluminium/Brass RPM   4626
Spindle Speed Wood/Plastic RPM   6901
Feed per revolution mm   0.12
 

9326518000655Bar 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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