Sgs 07298 Circuit Board Drill Bit No. 73 Solid Carbide

Product Description

The SGS 07298 is a solid carbide circuit board drill bit designed for precision drilling in printed circuit board fabrication and related fine-tolerance applications. It carries a wire gauge size of No. 73, corresponding to a decimal diameter of 0.0240 inches (0.61 mm), with a 130-degree four-facet point geometry that promotes accurate entry and minimizes walking on hard, abrasive substrates. The 1/8-inch (0.1250-inch decimal) shank diameter fits standard PCB drilling spindles and CNC drill chucks. Overall length is 1.5 inches, with a flute length of 0.3400 inches. The uncoated solid carbide construction provides the rigidity and edge retention required at sub-millimeter diameters.

This drill bit is suited for small-hole drilling operations in electronics manufacturing, prototyping shops, and precision machining environments. The regular spiral with a 30-degree helix angle and tapered web configuration handles a broad range of workpiece materials, including aluminum, copper alloy, plastics, fiber-reinforced polymers, stainless steel, titanium, cobalt alloy, cast iron, and nickel-based alloys. Right-hand cutting direction is standard for conventional CNC and benchtop drilling setups used by machinists and electronics fabricators.

Key Features

• No. 73 wire size - 0.0240-inch (0.61 mm) diameter for fine-tolerance circuit board holes
• 130-degree four-facet point reduces walking and improves entry accuracy on hard substrates
• Solid carbide construction delivers rigidity and edge retention at sub-millimeter scales
• Regular spiral with 30-degree helix angle clears chips efficiently across multiple material types
• Tapered web configuration adds strength at the drill tip without sacrificing cut quality
• Uncoated finish compatible with a wide range of materials including fiber-reinforced polymers and titanium alloys

Compatibility

Designed for use with standard 1/8-inch shank PCB drilling spindles, CNC drill presses, and compatible collet chucks used in circuit board fabrication and precision drilling applications. Compatible workpiece materials include aluminum, cast iron, cobalt alloy, copper alloy, fiber-reinforced polymers, nickel, plastics, stainless steel, and titanium.

Installation Notes

This bit is installed by machinists or electronics fabrication technicians using a collet or chuck sized for the 1/8-inch shank. Ensure the spindle and workpiece are secured before initiating the drilling cycle. At this diameter, feed rate and spindle speed must be carefully controlled to avoid bit breakage - consult the machine manufacturer guidelines for recommended parameters for carbide tooling at sub-0.030-inch diameters. Inspect the bit for tip chipping before each use, as solid carbide at this scale is brittle and sensitive to side loading.