Sgs 07391 Circuit Board Drill Bit 2.9 Mm Solid Carbide

Product Description

The SGS 07391 is a solid carbide circuit board drill bit engineered for precision drilling in PCB fabrication and electronic assembly applications. It measures 2.9 mm (0.1142 inches) in diameter with a 1/8-inch (3.18 mm) shank diameter and an overall length of 1.5 inches (38.10 mm). The 130-degree four-facet point geometry reduces thrust and walking at entry, which is critical when drilling into multilayer boards or composite substrates. The uncoated solid carbide construction provides the rigidity and edge retention needed for high-speed, small-diameter boring. Weighing approximately 0.1 pounds, this is a single-piece, single-use consumable tool suited for production and bench work alike.

This drill bit is rated for use in a wide range of workpiece materials including aluminum, cast iron, cobalt alloy, copper alloy, fiber-reinforced polymers, nickel, plastics, stainless steel, and titanium. It is well-suited for electronics manufacturing, prototype board work, and precision machining environments where tight hole tolerances and clean entry are required. The heavy-duty grade designation indicates it is built for demanding drilling conditions rather than light-duty or intermittent use. Typical installations involve CNC drilling machines, PCB drill presses, or high-speed rotary spindles used by machinists and electronics technicians.

Key Features

• 2.9 mm (0.1142 inch) drill diameter with a tolerance of -0.0003 to +0.0000 inches for tight, repeatable hole sizing
• 130-degree four-facet point reduces thrust and improves entry precision on thin or laminated substrates
• Solid carbide construction delivers rigidity and edge retention in abrasive and hard materials
• 1/8-inch shank diameter is compatible with standard PCB drill chucks and CNC spindle tooling
• Regular spiral with 30-degree helix angle and tapered web for efficient chip evacuation
• Uncoated finish suitable for non-ferrous metals, composites, and polymers without coating adhesion concerns

Compatibility

Designed for use in CNC PCB drilling machines and high-speed drill presses 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 material application codes K, M, N, P, and S.

Installation Notes

This bit is installed by machinists or electronics technicians into a compatible collet or chuck accepting a 1/8-inch shank. Ensure spindle and workpiece are fully secured before operation. Do not exceed the spindle speed rating of the machine or the manufacturer-recommended feed rate for the specific substrate material. Inspect the cutting edge before each use — solid carbide bits are brittle and should be replaced if chipping or edge wear is observed.