Guhring 9038990012000 Micro Drill Bit 1.2mm Carbide

Product Description

The GUHRING 9038990012000 is a solid carbide micro drill bit designed for precision drilling in demanding industrial and machining applications. It features a 1.2 mm diameter (0.0472 inches), a 140-degree faceted point, and a TiAlN coating that extends tool life under elevated cutting temperatures. The spiral flute geometry promotes efficient chip evacuation, and the web-thinned design reduces thrust force at entry. With an overall length of 38 mm and a 3 mm straight-cylindrical shank, this bit is suited for CNC machining centers, drill presses, and precision hand-fed setups where tight hole tolerances are required. It is installed and operated by machinists and tool-and-die professionals working to close tolerances.

The 9038990012000 is built for drilling cast iron and steel — ISO material codes K and P — at depths up to 8.2 mm (0.323 inches). The flute-to-diameter ratio of 5xD makes it appropriate for moderately deep micro-holes in production and toolroom environments. The h7 diameter tolerance on the drill ensures consistent, repeatable hole sizing across high-volume runs. This bit does not support coolant-through delivery, so external coolant or misting is the standard approach for heat management in continuous-cycle use.

Key Features

• Solid carbide construction with M40 grade carbide substrate for rigidity and wear resistance
• TiAlN coating provides oxidation resistance and extended tool life at elevated cutting speeds
• 140-degree faceted point with web thinning reduces entry thrust and improves centering accuracy
• h7 diameter tolerance ensures consistent hole sizing for precision fitment applications
• 5xD flute-to-diameter ratio supports drilling depths up to 8.2 mm
• Right-hand spiral flute promotes upward chip evacuation in standard CNC and manual drilling setups

Compatibility

Designed as a Series 3899 micro drill bit for use in CNC machining centers and precision drilling equipment accepting a 3 mm straight-cylindrical shank. Primary workpiece compatibility is rated for cast iron (ISO code K) and steel (ISO code P).

Installation Notes

Installation and operation should be performed by qualified machinists familiar with micro-tooling practices. Secure the 3 mm shank in a precision collet or drill chuck rated for the shank diameter to minimize runout. Power down and lock out the spindle before loading or unloading the bit. Because this bit does not support coolant-through delivery, apply external coolant or air mist to control heat buildup during continuous drilling cycles. Avoid excessive feed rates that can cause micro-drill deflection or breakage in hard or interrupted-cut materials.