Sgs 07390 Circuit Board Drill Bit Size 33 Solid Carbide

Product Description

The SGS 07390 is a solid carbide circuit board drill bit designed for precision drilling in printed circuit board fabrication and other tight-tolerance applications. It carries a wire gauge size of 33, which corresponds to a decimal diameter of 0.1130 inches (2.87 mm), with a 1/8 inch (0.1250 inch decimal) shank diameter. The 130-degree four-facet point geometry reduces walking and improves hole entry accuracy. At 1.5 inches overall length with a regular right-hand spiral and 30-degree helix angle, this bit is built for clean, consistent throughput in automated and manual drilling setups. Solid carbide construction provides the rigidity and edge retention required for hard and abrasive workpiece materials.

This bit is suited for production and repair drilling in PCB manufacturing environments as well as precision machining applications involving aluminum, copper alloy, cast iron, stainless steel, titanium, cobalt alloy, nickel, plastics, and fiber-reinforced polymers. The uncoated finish makes it appropriate for applications where coating buildup or heat transfer properties are a concern. It is sold individually and is commonly used by PCB fabricators, CNC machinists, and electronics repair technicians working with tight hole tolerances.

Key Features

• Wire size 33 diameter: 0.1130 inches (2.87 mm) with a tolerance of -0.0003 to +0.0000 inches
• 130-degree four-facet point for accurate hole entry and reduced bit walking
• Solid carbide construction for rigidity and extended edge life in abrasive materials
• 1/8 inch shank diameter (0.1250 inches decimal, 3.18 mm) for standard collet and chuck compatibility
• Regular spiral with 30-degree helix angle and tapered web for efficient chip evacuation
• Right-hand cut with 2 flutes; uncoated finish compatible with a broad range of workpiece materials

Compatibility

The SGS 07390 is rated for use with aluminum, cast iron, cobalt alloy, copper alloy, fiber-reinforced polymers, nickel, plastics, stainless steel, and titanium workpiece materials per SGS Series 105 specifications.

Installation Notes

This bit is installed in a standard 1/8 inch collet, drill chuck, or CNC spindle compatible with the shank diameter. Secure the shank fully before operation and verify spindle runout is within tolerance for circuit board work, as small-diameter carbide bits are brittle and susceptible to breakage from lateral loading. Power down and lock out any CNC or drilling equipment before changing bits. Carbide tooling should not be used in applications that produce shock loads or interrupted cuts beyond the material ratings listed by the manufacturer.