Guhring 9003290070000 Cobalt Stub Drill Bit 7mm

Product Description

The GUHRING 9003290070000 is a cobalt (M35 material grade) screw machine length drill bit designed for demanding metal-cutting applications. Built to DIN 1897 standards, it features a 7.00 mm diameter, a 130-degree point angle for self-centering on tough materials, and a web-thinned tapered web configuration that reduces thrust and improves chip evacuation. The oxide finish provides baseline lubricity and heat resistance. With an overall length of 2.9134 inches and a flute length of 1.3386 inches, this stub-length bit is suited for work in confined spaces or on short-stroke machines. It is installed and operated by machinists and tool-room technicians.

This drill bit is intended for production drilling in steel, stainless steel, cast iron, and high-temperature alloys. The stub length and rigid geometry make it a practical choice for CNC machining centers, turret lathes, drill presses, and screw machines where overhang must be minimized and rigidity maximized. The 2-flute regular spiral configuration handles chip clearing in through-hole and blind-hole drilling across these workpiece materials. It is suited for both job-shop and production environments where tool consistency and dimensional accuracy are required.

Key Features

• Cobalt M35 construction for elevated heat resistance when drilling hard and abrasive metals
• 130-degree point angle with cone relief geometry for positive self-centering and reduced walking
• Web-thinned tapered web reduces axial thrust and improves cutting efficiency
• Oxide finish for lubricity and basic corrosion resistance during storage and use
• DIN 1897 stub length provides extra rigidity and reduced deflection versus jobber-length bits
• Straight cylindrical shank with 0.2756 inch diameter for standard chuck and collet compatibility
• Diameter tolerance of +0.000 to -0.022 mm for consistent, repeatable hole sizing

Compatibility

Designed as an OEM-style stub drill bit for use in any standard straight-shank chuck or collet rated for 7.00 mm shanks. Primary workpiece materials include steel, stainless steel, cast iron, and high-temperature alloys per the manufacturer specification.

Installation Notes

Installation is performed by a machinist or tool-room technician. Secure the straight shank fully in a compatible drill chuck or collet and verify runout before production use. Power down or de-energize the machine spindle completely before inserting or removing the bit. Do not exceed the recommended maximum drilling depth of 1.3386 inches per pass without clearing chips to prevent flute packing and bit breakage.