Sgs 07389 Circuit Board Drill Bit 2.85 Mm Solid Carbide

Product Description

The SGS 07389 is a solid carbide circuit board drill bit designed for precision drilling in printed circuit board fabrication and similar close-tolerance applications. It measures 2.85 mm (0.1122 inches) in diameter with a 130-degree four-facet point geometry that promotes accurate entry and minimizes walkout on hard or layered substrates. The overall length is 1-1/2 inches (38.10 mm), with a 1/8-inch (3.18 mm) shank diameter that fits standard CNC drill spindles and high-speed drill presses. The uncoated solid carbide construction and heavy-duty grade designation make this bit suitable for demanding drilling cycles where dimensional accuracy is critical. It is a single-piece, right-hand-cut tool intended for professional and production-level use.

This drill bit is suited for drilling circuit boards, composite laminates, and a broad range of engineering materials including aluminum, copper alloys, stainless steel, titanium, cobalt alloys, cast iron, fiber-reinforced polymers, plastics, and nickel-based materials. The 30-degree helix angle and regular spiral flute configuration support efficient chip evacuation in both manual and CNC-driven setups. It is commonly used in electronics manufacturing, aerospace component fabrication, and precision machine shops where small-diameter hole quality is non-negotiable.

Key Features

• 2.85 mm (0.1122 inch) cutting diameter with tight tolerance of -0.0003 to +0.0000 inches for repeatable hole sizing
• 130-degree four-facet point reduces walking and improves hole entry accuracy on hard substrates
• Solid carbide construction provides rigidity and wear resistance in high-cycle drilling applications
• 1/8-inch (3.18 mm) shank compatible with standard CNC router and drill spindle collets
• Regular spiral with 30-degree helix angle supports controlled chip evacuation in deep or stacked material drilling
• Uncoated finish suitable for non-ferrous metals, plastics, and fiber-reinforced polymer laminates

Compatibility

Designed for use with CNC drilling machines, high-speed drill presses, and spindle systems accepting a 1/8-inch shank. Compatible workpiece materials include aluminum, cast iron, cobalt alloy, copper alloy, fiber-reinforced polymers, nickel, plastics, stainless steel, and titanium per SGS Series 105 specifications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or technicians familiar with CNC drilling equipment and small-diameter carbide tooling. Secure the 1/8-inch shank fully in a properly sized collet and verify runout before beginning a drilling cycle, as carbide bits at this diameter are susceptible to breakage from lateral deflection. Always power down and lock out the machine spindle before changing tooling. Follow the equipment manufacturer's recommended feed rate and spindle speed guidelines for the specific workpiece material being drilled.