Guhring 9003050025300 Cobalt Jobber Drill Bit No. 39

Product Description

The GUHRING 9003050025300 is a cobalt jobber length drill bit sized to wire gauge No. 39, equivalent to 0.0995 inches in decimal diameter. Built to DIN 338 standards, this two-flute drill features a 118-degree standard point angle with web thinning for easier penetration and reduced thrust. The oxide coating improves surface hardness and provides basic lubricity. With an overall length of 57 millimeters and a straight-cylindrical shank, the bit is suited for benchtop drilling machines, hand drills, and CNC drill presses. It is a general-purpose tool installed and used by machinists, maintenance technicians, and fabricators working in production or job-shop environments.

This drill bit is engineered for general-purpose drilling in ferrous materials, with primary workpiece material ratings covering cast iron and steel. The regular spiral flute and 5xD flute-to-diameter ratio support chip evacuation in through-hole and blind-hole applications. The maximum drilling depth is 1.032 inches (26.21 millimeters), making it appropriate for thin-stock and moderate-depth drilling operations. The straight-cylindrical shank with a diameter of 0.0996 inches seats securely in standard drill chucks without the need for specialized toolholders.

Key Features

• Wire gauge No. 39 diameter — 0.0995 inches decimal equivalent
• Cobalt construction with oxide coating for improved wear resistance on ferrous materials
• 118-degree standard point angle with web thinning to reduce entry thrust
• DIN 338 specification, Series 305 — consistent geometry for repeatable hole quality
• Two-flute regular spiral design for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber length drill bit rated for cast iron and steel workpiece materials per DIN 338 Series 305 specification. Suitable for use in standard drill chucks accepting a 0.0996-inch straight-cylindrical shank.

Installation Notes

This drill bit is installed and used by machinists and technicians operating drill presses, hand drills, or CNC drilling equipment. Secure the straight-cylindrical shank firmly in the drill chuck before operation and verify chuck key removal before powering the machine. Use appropriate cutting fluid or coolant for steel applications to extend tool life, noting that this bit does not support coolant-through delivery. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or excessive wear is observed.