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Sherwood Drill Bits 114pcs HSS Ground Flute Jobber Drill

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Last Updated
02 Nov 2021
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1 unit

Specification of Sherwood Drill Bits 114pcs HSS Ground Flute Jobber Drill


Sherwood HSS Jobber Drill Ground Flute Set-114 Pieces



Sherwood Jobber drills are general-purpose drills for steels, cast steel, grey cast iron, malleable cast iron, brass, aluminium alloy of nickel and graphite. With precision-ground flutes and black finish (W-finish), this is the most common surface finish and is the result of a steam tempering operation in which steam is just passed over the product during a controlled tempering cycle, producing a black oxide layer. Black tools aregenerally recommended for applications where the ferrous oxide layer aids chip flow, helps to dissipate heat by retaining some coolant on the tool surface and also helps to prevent the tool from staining.



 



HSS Jobber Drill Ground Flute Set-114 Pieces

Industrial quality. Ground flute, blue finish. Supplied in indexing metal cases.

Point angle: 118, helix angle: normal, web thickness: standard, relief angle: 10-20, tolerance of diameter: h8, tolerance of shank: f11.

 


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