Hertel 42084 Cobalt Jobber Drill Bit 6mm 135 Degree

Product Description

The HERTEL 42084 is a cobalt jobber-length drill bit designed for general-purpose drilling in tough materials including hardened steels, stainless steel, cast iron, and high-temperature alloys. Built from M35 cobalt steel with an oxide and gold coating, this bit offers improved heat resistance and extended tool life compared to standard high-speed steel alternatives. The 135-degree split point reduces walking and enables faster penetration with less feed pressure. At 93 mm overall length with a 57 mm flute length, it fits standard drill chucks in handheld drills and drill presses. Right-hand spiral flutes clear chips efficiently during through-hole and blind-hole drilling.

This bit suits metal fabrication, maintenance and repair, HVAC installation work, plumbing rough-in, and electrical trade drilling tasks where hard metal penetration is required. The straight cylindrical shank accepts standard three-jaw chucks without adapters. Its 5xD flute-to-diameter ratio is typical for jobber-length drilling in ferrous metals. Both professional tradespeople and production shops use this size regularly for conduit knockouts, pipe hangers, bracket work, and general structural drilling.

Key Features

• M35 cobalt steel construction provides heat and wear resistance for drilling hard ferrous metals
• 135-degree split point reduces drill walking and decreases required feed force
• Oxide and gold coating improves surface lubricity and helps resist corrosion
• Right-hand cut, regular spiral flutes promote efficient chip evacuation
• Straight cylindrical shank fits standard three-jaw drill chucks
• Jobber-length format offers versatility across handheld drills and stationary drill presses

Compatibility

Designed as an OEM-style replacement or direct substitute for jobber-length cobalt drill bits in the 6 mm diameter class, fitting any standard drill press or handheld drill with a three-jaw chuck sized to accept a straight cylindrical shank.

Installation Notes

This bit is installed and used by HVAC technicians, plumbers, electricians, and general metalworkers. Secure the shank firmly in the chuck before operation and verify the workpiece is clamped or fixtured to prevent rotation. Use cutting fluid or coolant when drilling stainless steel or hardened alloys to preserve bit life. Replace the bit if the cutting edges show visible chipping or the coating is fully worn through, as continued use with a dull cobalt bit increases heat and can damage the workpiece.