Guhring 9003290040000 Cobalt Stub Drill Bit 4mm

Product Description

The GUHRING 9003290040000 is a cobalt (M35 grade) screw machine length drill bit designed for demanding drilling applications in hard and abrasive materials. Built to DIN 1897 standards, this stub-length bit features a 4.00 mm diameter, a 130-degree split point with web thinning, and an oxide finish. The right-hand spiral flute geometry and tapered web configuration deliver efficient chip evacuation and consistent hole quality. Licensed tradespeople and machinists working with titanium alloys and similar tough metals rely on this type of bit for its thermal resistance and edge retention under high-feed conditions.

This bit is suited for precision drilling in metalworking environments including aerospace, industrial maintenance, and fabrication shops. The stub length format — with a 22.00 mm flute length and 55.00 mm overall length — provides added rigidity compared to jobber-length bits, reducing deflection in short-depth applications. The straight-cylindrical shank is compatible with standard drill chucks and collets. Primary workpiece material is titanium alloy, though the cobalt composition also handles hardened steel and stainless steel in typical trade scenarios.

Key Features

• Cobalt M35 material grade for superior heat and wear resistance in hard metals
• 130-degree point angle with web thinning for reduced thrust and cleaner entry
• DIN 1897 stub length for increased rigidity and reduced deflection
• Oxide surface finish for added lubricity and corrosion resistance
• Tapered web configuration with regular spiral flute for efficient chip removal
• Straight-cylindrical shank fits standard drill chucks and collets without adapters

Compatibility

Designed as an OEM-style replacement or direct-fit option for applications requiring a DIN 1897 stub-length drill bit with a 4.00 mm straight-cylindrical shank. Compatible with standard drill chucks and collets accepting a 4.00 mm shank diameter. Primary rated workpiece material is titanium alloy per Series 329 specifications.

Installation Notes

Installation of this bit should be performed by qualified machinists or tool-and-die professionals familiar with cutting tool setup. Ensure the drill chuck or collet is fully tightened and the shank is fully seated before operation. Power down the machine and lock out energy sources before changing bits. Do not exceed the rated maximum drilling depth of 22.00 mm to avoid bit deflection or breakage.