Chicago-Latrobe 47360 12.80mm HSS 118° Jobber Drill Bit

Chicago-Latrobe 47360 12.80mm Jobber Drill Bit

This high-speed steel jobber drill bit measures 12.80 mm with a 118-degree point angle. It suits metalworkers and maintenance technicians drilling precise holes in steel and alloy. The radial point design aids accurate starting without a centre punch. It is not for operators needing coolant-through capability or carbide-tipped longevity.

12.8 mm capacity with .5039 decimal equivalent

The 12.8 mm diameter handles standard structural and fabrication hole sizes up to this metric dimension. Black oxide finish adds lubricity and corrosion resistance during extended drilling cycles. The bit lacks coolant holes, so deep-hole chip evacuation relies on frequent pecking. It runs out of effective reach beyond the standard jobber flute length.

Thermals and power draw in normal use

High-speed steel construction manages heat build-up during intermittent drilling in mild steel. The 118-degree point reduces thrust force, lowering motor load on handheld or bench machines. Black oxide surface retains cutting fluid film, limiting friction at the cutting lips. No coolant-through design means external lubrication is required for sustained high-speed operation.