M.a. Ford 20648440 Carbide Screw Machine Drill Bit 31/64

Product Description

The M.A. FORD 20648440 is a solid carbide screw machine length drill bit designed for high-precision drilling in demanding industrial and machining applications. Built to Series 206 specifications, it features a 118-degree faceted point angle, a regular spiral flute, and a web-thinned parallel web configuration for improved chip evacuation and reduced thrust. The bit measures 0.4844 inches (31/64 inch) in diameter with an overall length of 3 inches and a straight-cylindrical shank. Its bright/uncoated finish suits applications where coating is not required or where the base carbide substrate performs best unmodified.

This drill bit is engineered for right-hand cutting in a short-length format, making it well-suited for screw machine operations, CNC machining centers, and production drilling environments where rigidity and hole accuracy are critical. Primary workpiece materials include cast iron, non-ferrous metals, stainless steel, and steel. The 3xD flute-to-diameter ratio and 1.25-inch flute length support controlled chip removal in these materials. It is typically installed and operated by machinists and tool-and-die professionals working in precision manufacturing settings.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous and non-ferrous materials
• 118-degree faceted drill point with web-thinned parallel web for reduced entry thrust
• Regular spiral flute, 1.25-inch flute length, 3xD ratio for efficient chip evacuation
• Straight-cylindrical shank at 0.4844 inches for standard chuck and collet compatibility
• Right-hand cut with bright/uncoated finish suitable for cast iron, stainless steel, and steel
• Diameter tolerance held to +0.0000 to -0.0005 inches for tight-tolerance hole work

Compatibility

Designed as an OEM-style screw machine length drill bit for use in standard straight-shank drill chucks and collets on screw machines, lathes, and CNC machining centers requiring a 31/64-inch diameter hole in the 0.4500 to 0.5000 inch size range.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with carbide tooling. Ensure the spindle and chuck are fully powered down before loading or removing the bit. Carbide tooling is brittle and should not be subjected to side-loading, interrupted cuts beyond its rated capability, or improper runout conditions that can cause chipping or fracture. Verify chuck or collet runout is within acceptable limits before production use.