M.a. Ford 20404200A Jobber Drill Bit Wire Size 58 Carbide

Product Description

The M.A. FORD 20404200A is a solid carbide jobber-length drill bit designed for precision drilling in demanding metalworking applications. It carries a wire gauge size of 58, corresponding to a decimal diameter of 0.0420 inches, and features a 118-degree, 4-facet point for accurate self-starting and reduced walking on hard surfaces. The bit is coated with ALtima AlTiN (Aluminum Titanium Nitride), which improves heat resistance and extends tool life in high-speed cutting environments. At 1.5 inches overall length with a 0.75-inch flute length, this is a compact-format drill suited for tight-clearance work. It is installed and used by machinists, tool-and-die technicians, and precision metalworking professionals.

This drill bit is built for general-purpose drilling in steel, stainless steel, and cast iron. Its regular spiral flute geometry and right-hand cutting direction make it compatible with standard drill presses, CNC machining centers, and hand-held power tools where a straight-shank bit is accepted. The 5xD flute-to-diameter ratio provides effective chip evacuation in short, deep holes relative to the bit diameter. Web thinning reduces thrust requirements, which is particularly useful at this small diameter where feed force control is critical.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• ALtima AlTiN coating improves thermal resistance and extends cutting life in steel and stainless steel
• 118-degree, 4-facet point for accurate entry and reduced drill walk
• Web-thinned design reduces axial thrust at small diameters
• Right-hand, regular spiral flute geometry for standard CNC and manual machine compatibility
• Diameter tolerance held to +0.0000 to -0.0005 inches for precision fit applications

Compatibility

Designed as a general-purpose replacement or production drill bit for applications in steel, stainless steel, and cast iron. Accepts straight-shank collets and chucks sized for a 0.0420-inch shank diameter. Part of M.A. FORD Series 204.

Installation Notes

This bit is installed by machinists and CNC operators using a collet, drill chuck, or toolholder rated for the 0.0420-inch straight shank diameter. Ensure the spindle and workpiece are properly secured before operation. At this diameter, use appropriate low-feed, high-speed parameters to avoid bit deflection or breakage. Do not apply coolant through the tool, as this bit does not support through-coolant delivery.