Guhring 9003010006400 Cobalt Micro Drill Bit Size 72

Product Description

The GUHRING 9003010006400 is a cobalt micro drill bit designed for precision drilling in small-diameter applications. Built to DIN 1899 specification, this Series 301 bit carries a wire gauge size of 72, corresponding to a decimal diameter of 0.0252 inches. It features a 118-degree faceted point angle with web thinning on a tapered web configuration, which reduces entry force and improves centering on hard materials. The overall length is 0.984 inches with a straight-cylindrical shank diameter of 1.00 mm. The bright, uncoated cobalt construction offers heat resistance suitable for demanding workpiece materials. Right-hand spiral flutes evacuate chips efficiently during the cut.

This bit is suited for drilling aluminum, titanium alloy, and similar materials in precision manufacturing, aerospace component work, and high-tolerance machining environments. The 5xD flute-to-diameter ratio supports drilling to a maximum depth of 0.1280 inches (3.24 mm). It is typically used in CNC machining centers, drill presses, and precision hand-held equipment where consistent hole size and surface finish in micro-diameter bores are required. The regular spiral type and straight-cylindrical shank make it compatible with standard collet and chuck systems sized for 1.00 mm shanks.

Key Features

• Wire gauge size 72 with 0.0252-inch decimal diameter for micro-precision drilling
• 118-degree faceted point with web thinning and tapered web for improved entry and reduced thrust
• Cobalt tool material provides elevated heat resistance for aluminum and titanium alloy applications
• Bright/uncoated finish - no coating thickness to affect tight-tolerance hole sizing
• Straight-cylindrical 1.00 mm shank fits standard collet and micro-chuck tooling
• Conforms to DIN 1899 specification for consistent dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-fit micro drill bit for precision machining setups requiring a wire size 72, 1.00 mm shank, straight-cylindrical bit conforming to DIN 1899 Series 301 standards.

Installation Notes

Installation and use of micro drill bits should be performed by qualified machinists or tooling technicians familiar with small-diameter tooling practices. Ensure the spindle and chuck or collet are fully powered down and locked out before inserting or removing the bit. Confirm the collet or chuck is rated for a 1.00 mm shank diameter to prevent runout or tool slippage. Avoid side-loading or bending forces during drilling, as cobalt micro bits are brittle at this diameter and susceptible to breakage under off-axis loads.