M.a. Ford 20640400 Screw Machine Drill Bit 0.404 in

Product Description

The M.A. FORD 20640400 is a screw machine length (stub length) solid carbide drill bit with a 0.404-inch diameter, corresponding to Letter Y sizing. Designed for short-reach drilling applications where rigidity and precision matter, it features a 118-degree faceted point angle with web thinning for reduced thrust at entry. The two-flute spiral design in a right-hand cut configuration delivers efficient chip evacuation. With a bright/uncoated finish and a parallel web construction, this bit is built for shops and machinists running high-precision production or maintenance drilling on hard and abrasive workpiece materials.

This drill bit is suited for drilling cast iron, non-ferrous metals, stainless steel, and steel. The screw machine length format keeps the tool short and stiff, making it a preferred choice for CNC machining centers, drill presses, and manual machines where chatter and deflection must be minimized. The straight-cylindrical shank fits standard drill chucks without an adapter. It is appropriate for toolroom use, production machining, and maintenance repair operations requiring tight diameter tolerances.

Key Features

• Solid carbide construction for superior hardness and wear resistance in ferrous and non-ferrous materials
• 118-degree faceted drill point with web thinning for reduced entry thrust and self-centering performance
• Bright/uncoated finish suitable for use with or without coolant on a wide range of materials
• Short stub length at 2.75 inches overall reduces deflection and improves hole accuracy
• Diameter tolerance of +0.0000 to -0.0005 inches for precision bore sizing
• Two spiral flutes with regular helix for consistent chip clearance

Compatibility

Designed as a Series 206 screw machine length solid carbide drill bit for use in applications requiring Letter Y (0.4040-inch) diameter holes in cast iron, non-ferrous metal, stainless steel, and steel workpieces.

Installation Notes

Installation and use should be performed by qualified machinists or tool and die professionals familiar with carbide tooling. Secure the straight-cylindrical shank firmly in a compatible drill chuck or collet before operation. Solid carbide tooling is brittle — avoid side loading, interrupted cuts without proper setup, or dropping the tool. Verify spindle speed and feed rate are appropriate for the workpiece material and machine before starting.