Guhring 9006590073700 Cobalt Stub Drill Bit 0.2902in

Product Description

The GUHRING 9006590073700 is a cobalt screw machine (stub) length drill bit engineered for demanding metal-cutting applications. Built to DIN 1897 standards, it features a 0.2902-inch diameter with a parabolic flute geometry and a 130-degree split point that reduces walking and lowers thrust on entry. The straight-cylindrical shank measures 0.2902 inches in diameter and 1.5748 inches in length, fitting standard drill chucks without adapters. Web thinning with a parallel web configuration reduces cutting resistance in tough materials. This bit is rated for heavy-duty use and is the correct tool when a standard jobber-length bit lacks the rigidity required for close-tolerance work in hard alloys.

This drill bit is designed for machining titanium alloy and similarly hard workpiece materials where a shorter flute length provides added stiffness and reduced deflection. With a maximum drilling depth of 0.9040 inches (22.95 mm) and a 3xD flute-to-diameter ratio, it suits CNC machining centers, drill presses, and manual operations in production or maintenance environments. The right-hand cut, two-flute parabolic design promotes efficient chip evacuation in deep holes without coolant-through capability, making it appropriate for applications using external flood or mist coolant. It is sold individually but carries a minimum order quantity of 10 units.

Key Features

• Cobalt construction for heat resistance and durability in hard-alloy cutting
• 130-degree split point reduces thrust and prevents bit walking on entry
• Parabolic flute profile improves chip evacuation in deep-hole drilling
• Web-thinned parallel web reduces cutting resistance in difficult materials
• Stub length body increases rigidity and minimizes deflection
• Diameter tolerance of +0.000 to -0.022 mm for consistent hole sizing

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit suited for use in standard drill chucks accepting a 0.2902-inch straight-cylindrical shank. Primary workpiece material is titanium alloy; also appropriate for other high-strength metals requiring a heavy-duty cobalt bit in the 0.2500 to 0.3000-inch diameter range.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician. Secure the shank fully in a drill chuck or collet and confirm runout before cutting. Always power down and lock out the machine before changing tooling. Use appropriate external coolant or cutting fluid when working titanium or other hard alloys to extend tool life and maintain hole tolerances.