Hertel 30204650 Circuit Board Drill Bit No. 56 Solid Carbide

Product Description

The HERTEL 30204650 is a solid carbide circuit board drill bit sized to wire gauge No. 56, with a decimal diameter of 0.0465 inches (1.18 mm). It features a 130-degree drill point angle, a fast spiral flute design with a 35-degree helix angle, and a tapered web configuration. The 0.125-inch (1/8 inch) straight shank seats cleanly in standard collet chucks. Right-hand cutting direction and bright polished finish make this bit well-suited for precision drilling in PCB fabrication and tight-tolerance machining work performed by machinists and electronics assembly technicians.

This bit is designed for drilling small-diameter holes in a range of materials including alloy steel, carbon steel, cast iron, stainless steel, high-temperature alloys, and titanium. Its fast spiral geometry promotes efficient chip evacuation at the small diameters common in circuit board and precision component work. The short overall length of 1.5 inches and 0.4-inch flute length make it appropriate for shallow, controlled drilling in bench-top drill presses, CNC machines, and precision hand-held drilling fixtures.

Key Features

• Solid carbide construction for rigidity and wear resistance at small diameters
• No. 56 wire gauge size — 0.0465 inches (1.18 mm) decimal diameter
• 130-degree drill point angle for clean entry in hard and abrasive materials
• Fast spiral flute with 35-degree helix angle for efficient chip evacuation
• Tapered web configuration adds strength at the cutting tip
• Bright polished finish — no coating buildup that could affect hole tolerances
• Diameter tolerance held to -0.0003 to +0.0000 inches for tight-fit applications

Compatibility

Designed as an OEM-style replacement or standard tooling option for any drilling application requiring a No. 56 wire gauge solid carbide bit with a 1/8-inch straight shank in CNC machining centers, drill presses, or precision PCB drilling equipment.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or trained technicians. Ensure the spindle and collet chuck are fully de-energized and at rest before inserting or removing the bit. Use a collet sized precisely to the 0.125-inch shank diameter to prevent runout. At these small diameters, solid carbide is brittle — avoid side loads, interrupted cuts without proper feed rate adjustment, and excessive hand pressure that can cause breakage.