M.a. Ford 20420400 Carbide Jobber Drill Bit No. 6

Product Description

The M.A. FORD 20420400 is a solid carbide jobber length drill bit in No. 6 wire size (0.2040 inches decimal) with a 118-degree faceted drill point. The bit measures 3.0 inches overall length with a 1.75-inch spiral flute and a straight-cylindrical shank diameter of 0.2040 inches. Web-thinned construction reduces thrust and improves chip evacuation at entry. The bright uncoated finish keeps the carbide substrate exposed for direct heat reading in production environments. Designed for use by machinists and toolroom technicians drilling precision-diameter holes in demanding base materials.

This bit is suited for general-purpose drilling in cast iron, non-ferrous metals, stainless steel, and carbon or alloy steel. The regular spiral geometry and 5xD flute-to-diameter ratio make it appropriate for through-hole and blind-hole applications in manual drill presses, CNC machining centers, and hand-held pneumatic drills where consistent hole tolerance is required. Its diameter tolerance of -0.0005 to 0.0000 inches ensures holes fall within tight limits without secondary reaming in many common production scenarios.

Key Features

• Solid carbide construction provides rigidity and wear resistance in abrasive and hard workpiece materials
• 118-degree faceted point with web thinning reduces entry thrust and improves centering
• Bright uncoated finish suitable for dry cutting and coolant-assisted operations where coating adhesion is not required
• Right-hand cut, regular spiral flute promotes consistent chip evacuation in most drilling orientations
• Diameter tolerance of -0.0005 to 0.0000 inches supports close-tolerance hole applications
• ISO 9001:2015 certified manufacturing ensures dimensional consistency across production lots

Compatibility

Designed as an OEM-style general-purpose jobber length drill bit for use in standard straight-shank drill chucks on CNC machining centers, drill presses, and pneumatic or electric hand drills accepting 0.2040-inch shank diameter tooling. Compatible workpiece materials include cast iron, non-ferrous metals, stainless steel, and steel as identified in Series 204 material codes K, M, N, and P.

Installation Notes

Secure the shank fully in a drill chuck or collet rated for the spindle speed appropriate to the workpiece material and bit diameter before operation. Power down the machine and lock out energy sources before changing tooling. Verify chuck runout within acceptable limits to protect the carbide shank from lateral loading, which can cause chipping or breakage. Follow applicable shop safety codes and machine manufacturer guidelines for RPM and feed rate selection.