Guhring 9055200063500 Cobalt Stub Drill Bit 0.25 in

Product Description

The GUHRING 9055200063500 is a cobalt stub-length (screw machine length) drill bit designed for precise, high-speed drilling in metal and non-ferrous materials. Built to DIN 1897 standards, this right-hand cut bit features a 118-degree four facet split point and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. At 0.25 inches (1/4 inch, Letter E) in diameter, it delivers clean entry in tight-clearance applications where standard-length bits are impractical. Licensed machinists, tool-and-die technicians, and maintenance professionals rely on this bit for production drilling in aluminum and similar workpiece materials.

This bit is suited for screw machine operations, CNC drill presses, and handheld production drilling setups where a short, rigid tool is needed to minimize deflection and chatter. The straight-cylindrical shank seats cleanly in standard chucks and collet holders. Its 3xD flute-to-diameter ratio and regular spiral geometry promote steady chip clearing over the 0.846-inch maximum drilling depth. Typical applications include aluminum plate, cast components, and general fabrication work in shop and field environments.

Key Features

• Cobalt tool material for heat and wear resistance in metal drilling
• 118-degree four facet split point with web thinning reduces thrust and self-centers on entry
• Stub length (DIN 1897) construction increases rigidity and reduces deflection versus jobber-length bits
• Two spiral flutes with regular helix promote efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet systems
• Right-hand cut; no coolant-through requirement simplifies setup

Compatibility

Designed as an OEM-style replacement or production-use stub drill bit conforming to DIN 1897 specification, fitting standard straight-shank chucks and collet holders sized for a 6.35 mm (0.25 inch) shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Ensure the drill press or CNC spindle is fully powered down and locked out before changing bits. Secure the straight-cylindrical shank firmly in a properly sized chuck or collet to the full shank engagement depth to prevent slippage and runout. Follow applicable shop safety standards and manufacturer guidelines for feed rate and speed selection based on workpiece material.