Guhring 9055230060400 Cobalt Jobber Drill Bit Letter B

Product Description

The GUHRING 9055230060400 is a cobalt jobber-length drill bit sized to Letter B (0.2380 inches) with a 118-degree four-facet split point. Built to DIN 338 standards from M35 cobalt high-speed steel, it delivers consistent performance in demanding production and maintenance drilling applications. The bright uncoated finish keeps the tool ready for use straight out of the package. The split-point geometry reduces walking at entry and lowers thrust force, making it well suited for hand-held drill motors and drill presses alike. Licensed machinists, maintenance mechanics, and metalworking tradespeople are the primary users of this bit.

This drill bit is rated for use in aluminum, as well as ferrous and non-ferrous materials per its K, M, N, and P material group designations. The regular spiral flute with a 5xD flute-to-diameter ratio handles chip evacuation efficiently in both through-hole and blind-hole work. A typical install scenario is production drilling in light manufacturing, HVAC fabrication shops, plumbing rough-in, and electrical panel or enclosure fabrication where consistent, repeatable hole sizing in Letter B diameter is required.

Key Features

• M35 cobalt high-speed steel construction for elevated heat and wear resistance
• 118-degree four-facet split point reduces drill walk and entry thrust
• DIN 338 standard geometry ensures dimensional interchangeability with other DIN-spec tooling
• Web-thinned tapered web improves cutting efficiency and chip flow
• Right-hand spiral flute with 5xD ratio for reliable chip evacuation
• Straight-cylindrical shank fits standard 3-jaw chucks without adapters

Compatibility

Designed as a DIN 338-spec jobber drill for use in any standard 3-jaw drill chuck accepting a 6.04 mm straight-cylindrical shank, compatible with drill presses, cordless and corded hand drills, and CNC drilling operations requiring Letter B diameter.

Installation Notes

This bit is installed and serviced by machinists, maintenance mechanics, and general tradespeople using standard drill chucks. Secure the shank fully in the chuck and verify chuck key is removed before powering the drill. Use appropriate cutting fluid or lubricant for the workpiece material to extend tool life and maintain hole tolerance. Inspect the cutting edges before each use and replace if chipping or wear is observed, as a degraded point will produce oversized or out-of-round holes.