Guhring 9055190062500 Cobalt Drill Bit Letter D

Product Description

The GUHRING 9055190062500 is a cobalt jobber-length drill bit sized to Letter D (0.2460 inches) with a titanium nitride (TiN) coating. Built to DIN 338 standards from M35 cobalt steel, this bit delivers the heat resistance and edge retention needed for production drilling in ferrous and non-ferrous materials. It features a 118-degree four-facet split point for accurate starting without a center punch, a web-thinned tapered web to reduce thrust, and a regular spiral flute geometry that evacuates chips efficiently. The straight-cylindrical shank measures 6.25 mm in diameter, fitting standard drill chucks. Overall length is 101 mm with a 63 mm flute length.

This bit is suited for general-purpose and production drilling applications across a range of workpiece materials including aluminum, mild steel, stainless steel, and cast materials. The TiN coating extends tool life in repetitive drilling cycles. It is a single-piece package appropriate for shop use, CNC setup, or field service work where a Letter D hole is required. Maximum drilling depth is 53.63 mm. The Series 5519 designation places it within a well-established jobber-drill family used by machinists, maintenance mechanics, and industrial tradespeople.

Key Features

• M35 cobalt steel construction for elevated heat resistance in harder materials
• Titanium nitride (TiN) coating reduces friction and extends cutting life
• 118-degree four-facet split point for self-centering starts and reduced thrust
• Web-thinned tapered web lowers drilling torque and improves chip clearance
• DIN 338 standard jobber length with 5xD flute-to-diameter ratio
• Right-hand cut, two-flute regular spiral for broad material compatibility

Compatibility

Designed as a DIN 338 jobber-length replacement drill bit for applications requiring a Letter D (0.2460-inch) diameter hole. Compatible workpiece material codes K, M, N, and P cover aluminum, cast materials, non-ferrous metals, and steel as specified in the supplier data.

Installation Notes

Installation of this drill bit is performed by machinists or maintenance mechanics using a standard drill press, milling machine, or hand drill with a compatible chuck accepting a 6.25 mm straight-cylindrical shank. De-energize and lock out any power equipment before changing tooling. Do not exceed the rated maximum drilling depth of 53.63 mm, and use appropriate cutting fluid for the workpiece material to preserve coating life.