Micro 100 DR-125-2 1/8" carbide jobber drill bit 118°

Micro 100 1/8" carbide jobber bit

The Micro 100 DR-125-2 is a solid-carbide jobber-length drill bit with a 1/8 inch diameter and a 118-degree conventional point. Bright uncoated finish suits general-purpose drilling in ferrous and non-ferrous materials where coolant-through is not required. Machinists and maintenance technicians choose it for rigid set-ups that demand the stiffness and wear resistance of carbide over high-speed steel. Decimal equivalent 0.1250 inch matches standard fractional sizing for precise hole-making.

Thermals noise and power in normal use

Carbide construction runs cooler than high-speed steel at equivalent feeds because the substrate conducts heat away from the cutting edges. No moving parts means the bit itself produces no audible noise; sound levels depend entirely on the machine spindle and workpiece fixturing. Power draw at the spindle is determined by the drill press or milling machine, not by the accessory, so the bit adds no extra electrical load beyond the cutting forces generated in the material.

Upgrades from high-speed steel jobber bits

This bit replaces standard high-speed steel jobber drills when tool life, hole accuracy or cutting speed must improve in abrasive or work-hardening alloys. The jump is worth it when a shop runs enough holes that fewer tool changes offset the higher upfront cost of carbide. It does not suit hand-held drilling, deep-hole applications requiring coolant-through, or operations where the rigidity of the set-up cannot prevent carbide chipping. Buyers needing larger diameters, different point angles or coated variants must select other part numbers.