Guhring 9006600006500 Micro Drill Bit 0.0256 in Cobalt

Product Description

The GUHRING 9006600006500 is a micro drill bit designed for precision drilling in demanding materials. Built from cobalt and finished with a TiN (titanium nitride) coating, it delivers extended tool life in applications where standard high-speed steel falls short. The bit measures 0.0256 inches in diameter with an overall length of 0.984 inches and a maximum drilling depth of 0.126 inches. A 118-degree faceted point with web thinning and a tapered web configuration promote accurate entry and reduced thrust force. Spiral fluting with a right-hand cut clears chips efficiently at small diameters. This bit is sized and built for machining technicians and toolroom professionals working with tight tolerances.

This bit is suited for precision drilling in aluminum, titanium alloy, and similar workpiece materials requiring tight dimensional control at small diameters. The Series 660 design follows DIN 1899 specification, making it appropriate for CNC machining centers, drill presses, and manual precision work where micro-diameter holes are required. The straight-cylindrical shank fits standard collet and chuck systems. A 5xD flute-to-diameter ratio supports chip evacuation in short, controlled drilling cycles typical of precision manufacturing and toolroom environments.

Key Features

• Cobalt construction with TiN coating for extended tool life in hard and abrasive materials
• 0.0256 inch diameter with diameter tolerance of +0.000 to -0.004 mm for precise hole sizing
• 118-degree faceted point with web thinning reduces entry thrust and improves centering
• Spiral flute with right-hand cut promotes chip clearance at micro diameters
• Straight-cylindrical shank with 1.00 mm shank diameter fits standard collet and chuck systems
• Conforms to DIN 1899 specification for consistent dimensional standards

Compatibility

Designed as an OEM-style replacement or direct tooling selection for applications requiring DIN 1899 micro drill bits in straight-cylindrical shank configurations. Primary workpiece materials are aluminum and titanium alloy per supplier-specified material codes K, M, N, P, and S.

Installation Notes

Installation and use of this micro drill bit should be performed by qualified machining technicians familiar with small-diameter tooling. Always verify spindle runout and collet condition before chucking micro-diameter bits, as even minor runout can cause breakage at this size. Reduce feed rates and spindle speeds relative to standard drill bit recommendations when working with cobalt micro tooling in hard materials. No coolant-through capability is present on this bit, so adequate external lubrication or air blast should be applied as required by the workpiece material.