Guhring 9038990004700 Micro Drill Bit 0.47mm Carbide

Product Description

The GUHRING 9038990004700 is a solid carbide micro drill bit designed for precision drilling in demanding metalworking applications. Built to Series 3899 specifications, it features a 0.47 mm diameter, a 140-degree faceted point angle, and a TiAlN coating that extends tool life in abrasive and high-temperature cutting conditions. The straight-cylindrical shank measures 3.00 mm in diameter, and the overall length is 38.00 mm. A web-thinned geometry reduces thrust force at entry, improving accuracy in small-diameter work. This bit is intended for use in CNC machining centers, drill presses, and precision hand-held spindle equipment operated by machinists and tool-and-die professionals.

The 9038990004700 is rated for primary use in cast iron and steel workpieces, consistent with ISO material codes K and P. The flute length is 7.00 mm with a maximum recommended drilling depth of 6.30 mm, following a 5xD flute-to-diameter ratio. It is suited for short, precise hole-making operations in production environments where tight tolerances and repeatable results are required. The h7 shank diameter tolerance ensures consistent seating in collet chucks and precision tool holders.

Key Features

• 0.47 mm cutting diameter with h7 shank diameter tolerance for accurate collet seating
• TiAlN coating provides heat and wear resistance in ferrous metal drilling
• 140-degree faceted point reduces walking and improves hole location accuracy
• Web-thinned geometry lowers thrust force at entry
• Solid carbide K40 grade construction for rigidity in micro-diameter applications
• Right-hand spiral flute with regular spiral type for efficient chip evacuation

Compatibility

Designed for use in cast iron and steel workpieces per ISO material codes K and P. Compatible with standard 3.00 mm straight-cylindrical collet chucks and precision tool holders accepting h7 shank tolerances.

Installation Notes

Installation should be performed by a qualified machinist familiar with micro-diameter tooling. Ensure the collet and tool holder are clean and free of debris before seating the shank to avoid runout. Do not exceed the maximum recommended drilling depth of 6.30 mm in a single pass without retracting to clear chips. This bit does not support coolant-through delivery; external or flood coolant should be used where applicable to manage heat at the cutting edge.