Guhring 9006590020000 Cobalt Stub Drill Bit 0.0787 in

Product Description

The GUHRING 9006590020000 is a stub-length (screw machine length) cobalt drill bit designed for demanding hole-making in titanium alloy and other hard materials. Built to DIN 1897 standards, it carries a 0.0787-inch diameter with a 130-degree split point and a web-thinned, parabolic flute geometry. The parallel web configuration reduces walking at entry and promotes chip evacuation in deep, interrupted cuts. At 1.496 inches overall length with a 0.472-inch flute length, this bit is sized for short-reach, high-rigidity drilling setups. It is a heavy-duty grade tool intended for production machining environments where tool life and hole accuracy matter.

This drill bit is used in screw machine operations, CNC drilling, and manual drill press work where a stub-length tool provides added rigidity over jobber-length alternatives. The cobalt construction handles work-hardening materials such as titanium alloy, stainless steel, and high-strength steel alloys. The straight-cylindrical shank seats directly in standard drill chucks or collets without additional adapters. A right-hand cut and parabolic flute design are well-suited for through-hole and blind-hole applications in both production shops and maintenance environments.

Key Features

• Cobalt tool material for elevated heat resistance and durability in hard-metal drilling
• 130-degree drill point angle with web thinning reduces entry force and improves self-centering
• Parabolic flute geometry promotes efficient chip evacuation at a 3xD flute-to-diameter ratio
• Stub (screw machine) length increases rigidity and reduces deflection in tight setups
• Straight-cylindrical shank fits standard chucks and collet systems without adapters
• Built to DIN 1897 specification for consistent dimensional tolerancing

Compatibility

Designed as an OEM-specification stub-length drill bit per DIN 1897, suitable for use in standard drill chucks, collet holders, and screw machine spindles accepting a straight-cylindrical shank at 0.0787-inch diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist or tooling technician. Ensure the drill press, CNC machine, or screw machine spindle is fully powered down and locked out before seating or removing the bit from the chuck or collet. Confirm shank engagement depth and chuck runout before beginning a drilling cycle. Do not exceed the maximum drilling depth of 0.354 inches per pass without clearing chips, as this bit does not support coolant-through delivery.