Guhring 9003010009900 Cobalt Micro Drill Bit Size 61

Product Description

The GUHRING 9003010009900 is a cobalt micro drill bit in wire gauge size 61, with a decimal diameter of 0.0390 inches and an overall length of 0.984 inches. The 118-degree faceted point and web-thinned, tapered web geometry reduce entry force and improve centering on entry. The spiral flute design promotes chip evacuation in confined bore depths. This bit is intended for use in CNC machining centers, drill presses, and handheld precision drilling applications. Machinists and toolroom technicians working with non-ferrous metals and titanium alloys are the primary installers. The bright, uncoated finish is suited for applications where coating buildup would compromise dimensional accuracy at this scale.

This drill bit is specified for drilling aluminum and non-ferrous materials as the primary workpiece material, with titanium alloys listed as a secondary workpiece material. The 5xD flute-to-diameter ratio and maximum drilling depth of 0.209 inches make it appropriate for shallow, precision bore work in production and prototype environments. The straight-cylindrical shank with a 1.50 mm shank diameter seats directly in standard collet chucks and micro drill chucks without adapter sleeves, making it a straightforward tool change in high-mix precision shops.

Key Features

• Wire gauge size 61 with 0.0390-inch decimal diameter and diameter tolerance of +0.000 to -0.004 mm for tight bore control
• 118-degree faceted point with web thinning for reduced thrust and accurate self-starting on flat and curved surfaces
• Cobalt construction provides heat and wear resistance when drilling aluminum and titanium alloys
• Spiral flute with regular helix angle supports chip clearance in shallow holes up to 0.209 inches deep
• Bright, uncoated finish eliminates coating delamination risk in micro-diameter applications
• Straight-cylindrical shank at 1.50 mm seats in standard micro drill chucks and collets without modification

Compatibility

The 9003010009900 is rated for primary use in aluminum and non-ferrous materials (material codes K, M, N, P) and secondary use in titanium alloys (material code S), conforming to DIN 1899 specification for micro drills in Series 301.

Installation Notes

This bit is installed and replaced by machinists or toolroom technicians operating CNC equipment or precision drill presses. Secure the straight-cylindrical shank fully in a collet or micro drill chuck before operation, and verify runout with a dial indicator when bore tolerances are critical. At micro diameters, excessive feed rate or misaligned workpiece fixturing are the primary causes of bit breakage. Coolant-through is not supported on this bit, so apply external cutting fluid appropriate to the workpiece material when drilling titanium alloys.