Guhring 9038990007900 Micro Drill Bit 1/32 in Carbide

Product Description

The GUHRING 9038990007900 is a solid carbide micro drill bit designed for precision drilling in demanding metalworking applications. Built to Series 3899 specifications, it features a 1/32 inch (0.0311 inch decimal) diameter with a 140-degree faceted point and a TiAlN coating that extends tool life under high-heat cutting conditions. The straight-cylindrical shank measures 3.00 mm in diameter, and the overall length is 38.00 mm. Web thinning reduces thrust force at the cutting tip, improving hole entry and chip evacuation. This bit is suited for machinists, tool and die technicians, and precision fabricators working with tight-tolerance bores in ferrous and cast materials.

This micro drill bit is engineered for use in cast iron and steel workpieces, classified under material codes K and P. The spiral flute geometry and 5xD flute-to-diameter ratio support chip clearance in shallow-to-moderate depth holes, with a maximum drilling depth of 6.82 mm (0.269 inch). It is appropriate for CNC machining centers, drill presses, and precision hand-held spindle tools where h7 diameter tolerance is required. The right-hand cutting direction is standard for conventional drill chuck setups. This bit is sold individually with a minimum order quantity of one.

Key Features

• Solid carbide K40 material grade for hardness and wear resistance in ferrous materials
• TiAlN coating extends tool life by reducing heat transfer into the substrate
• 140-degree faceted point with web thinning reduces entry thrust and improves centering
• Straight-cylindrical shank for secure seating in standard drill chucks and collets
• h7 diameter tolerance ensures consistent bore sizing for precision fitment
• Right-hand spiral flute geometry promotes efficient chip evacuation in cast iron and steel

Compatibility

Designed for use in cast iron and steel workpieces (material grades K and P). Compatible with standard drill chucks and collets accepting a 3.00 mm straight-cylindrical shank. Part of the GUHRING Series 3899 micro drill line.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or tooling technicians familiar with CNC or manual drilling equipment. Ensure the spindle and workpiece are properly secured before operation, and verify chuck or collet runout is within acceptable limits to avoid bit deflection or breakage at this diameter. Coolant-through is not supported on this bit; use external coolant or cutting fluid as appropriate for the workpiece material. Do not exceed the rated maximum drilling depth of 6.82 mm without pecking cycles to clear chips.