Guhring 9006600007900 Micro Drill Bit No 68 Cobalt Tin

Product Description

The GUHRING 9006600007900 is a cobalt micro drill bit designed for precision drilling in small-diameter applications. It carries a No. 68 wire gauge designation, equivalent to 1/32 inch (0.0313 inch decimal), with an overall length of 0.984 inches. The 118-degree faceted point with web thinning and tapered web configuration reduces entry force and improves centering accuracy. A TiN coating extends cutting-edge life when working through abrasive or work-hardening materials. This bit is suited for machinists, toolroom technicians, and precision fabricators running high-speed or CNC drilling operations where dimensional control at small diameters is critical.

The 9006600007900 is rated primarily for aluminum and nonferrous metals (material codes K, M, N, P) and secondarily for titanium alloys (material code S). The right-hand spiral flute evacuates chips efficiently in shallow-to-moderate depth holes, with a maximum drilling depth of 0.162 inch (4.12 mm). The straight-cylindrical shank with a 1.00 mm diameter seats securely in standard collet chucks and drill chuck fixtures used in benchtop drill presses, CNC machining centers, and precision hand-held drilling equipment. Series 660 conforms to DIN 1899 specification for micro-diameter twist drills.

Key Features

• No. 68 wire gauge size, 0.0313 inch decimal diameter, 1/32 inch fractional equivalent
• 118-degree faceted point with web thinning for reduced thrust and improved self-centering
• Cobalt tool material provides heat resistance for harder and abrasive workpiece materials
• TiN coating extends tool life and reduces built-up edge on nonferrous materials
• Right-hand regular spiral flute, 5xD flute-to-diameter ratio for efficient chip evacuation
• Conforms to DIN 1899 standard for micro-diameter twist drills

Compatibility

Designed for use in standard collet and drill chuck systems accepting a 1.00 mm straight-cylindrical shank. Primary workpiece materials are aluminum and nonferrous metals; secondary rated for titanium alloys per manufacturer material codes.

Installation Notes

This micro drill bit should be installed by a qualified machinist or toolroom technician familiar with small-diameter tooling. Secure the straight-cylindrical shank fully in a calibrated collet or drill chuck before operation, and verify runout with appropriate gauging before cutting. Always power down and lock out the machine spindle before changing tooling. Micro-diameter drills are brittle at this size range — avoid side loading, use appropriate feed and speed settings for the workpiece material, and do not use the bit to ream or pry.