Hertel 04138871 Cobalt Jobber Drill Bit Wire 40 135 Deg

Product Description

The HERTEL 04138871 is a cobalt jobber-length drill bit in wire gauge size 40, equivalent to 0.0980 inch decimal diameter. The bit features a 135-degree split point with web thinning for reduced thrust and faster starts without a center punch. An oxide and TiN coating adds surface hardness and lubricity for extended tool life in harder workpiece materials. The straight-cylindrical shank seats in standard three-jaw chucks. At 2.375 inches overall length with a 1.375-inch flute length, this is a compact, short-run drill suited for precision holemaking in tight clearances. It is a heavy-duty grade bit built for repeated use in production and maintenance settings.

This bit is designed for holemaking applications in metal fabrication, mechanical assembly, HVAC equipment manufacturing, electrical panel work, and general industrial maintenance. The cobalt steel construction handles hardened steels, stainless steel, cast iron, and high-temperature alloys that would wear standard HSS tooling prematurely. Right-hand spiral flute geometry evacuates chips efficiently in through-hole and blind-hole drilling. It suits drill presses, hand drills, and CNC spindles that accept a straight-cylindrical shank at 0.0980 inch diameter.

Key Features

• Wire gauge size 40 at 0.0980 inch decimal diameter for precision small-hole work
• 135-degree split point with web thinning reduces entry thrust and self-centers on the workpiece
• Cobalt steel construction withstands heat buildup in hard and abrasive materials
• Oxide and TiN dual coating improves surface hardness and reduces friction
• Regular right-hand spiral flute promotes consistent chip evacuation
• Heavy-duty grade rating for sustained production and repetitive drilling cycles

Compatibility

Designed as a jobber-series replacement drill bit for any standard three-jaw chuck or collet system accepting a 0.0980-inch straight-cylindrical shank, covering wire gauge size 40 holemaking requirements in drill presses, hand drills, and CNC machining centers.

Installation Notes

Secure the shank fully in the chuck jaws before tightening to prevent runout. Use cutting fluid or coolant appropriate to the workpiece material to preserve coating life, particularly when drilling stainless or hardened steel. Ensure the drilling machine is powered off and the spindle has come to a complete stop before changing or inspecting the bit. Follow applicable shop safety standards and machine guarding requirements when operating rotary cutting tools.