Harvey Tool EFG0310-C6 Micro Drill Bit No. 68 Solid Carbide

Product Description

The HARVEY TOOL EFG0310-C6 is a solid carbide micro drill bit engineered for precision drilling in hardened steel applications. It carries a No. 68 wire gauge designation, equivalent to 0.0310 inches (1/32 inch) in diameter, and features a 140-degree point angle optimized for accurate entry and reduced walking on hard, abrasive workpiece surfaces. The AlTiN Nano coating provides thermal resistance and surface hardness to extend tool life under the elevated cutting temperatures typical in hardened steel drilling. At 50 mm overall length with an 11 mm spiral flute, this bit is suited for controlled, short-depth holes in tight-tolerance applications. Installation is right-hand cut only.

This micro drill bit is part of the Harvey Tool Miniature High Performance Drills series for hardened steels. It is intended for use in CNC machining centers, precision drill presses, and manual mills where small-diameter, tight-tolerance hole making in hardened ferrous materials is required. Typical applications include tooling and die work, mold components, and precision instrument parts where hole diameter tolerance and surface finish are critical. The h6 shank tolerance on the 3 mm shank diameter ensures consistent tool holding in collet-style chucks.

Key Features

• Solid carbide construction for rigidity and wear resistance in hardened steel
• AlTiN Nano coating for high-temperature resistance and extended tool life
• 140-degree point angle reduces thrust force and improves point stability on entry
• No. 68 wire gauge size, 0.0310 inches diameter with h6 diameter tolerance
• Spiral flute geometry promotes chip evacuation in deep micro-holes
• Right-hand cut, compatible with standard CNC and manual spindle rotation

Compatibility

Designed for drilling hardened steel as both primary and secondary workpiece material. The 3 mm shank diameter with h6 tolerance is suited for precision collet chucks and tool holders accepting 3 mm shanks on CNC machining centers and precision drill presses.

Installation Notes

Installation and use of this tool should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and the machine is in a safe, locked state before inserting or removing the bit from the tool holder. Use a properly sized collet matched to the 3 mm shank for secure clamping and minimal runout. Do not exceed manufacturer-recommended feeds and speeds for the workpiece material and coating type, as micro-diameter carbide tooling is susceptible to breakage from excessive feed rates or lateral loading.