M.a. Ford 20646880 Screw Machine Drill Bit 15/32 Carbide

Product Description

The M.A. FORD 20646880 is a solid carbide screw machine length drill bit sized at 15/32 inch (0.4688 inches) in diameter, designed for short-hole drilling applications where rigidity and precision matter. Built from solid carbide with a bright/uncoated finish, this bit features a 118-degree faceted point angle and a web-thinned, parallel web configuration that reduces entry force and improves chip evacuation. The straight-cylindrical shank measures 0.4844 inches in diameter and fits standard drill chucks. With an overall length of 3 inches and a flute length of 1-1/4 inches, it is suited for metalworking environments where a compact, stiff tool is required. This bit is intended for use by machinists, tool and die professionals, and skilled trades operators running drilling operations on machine tools or drill presses.

The 20646880 is rated for use on cast iron, non-ferrous metals, stainless steel, and steel. Its 3xD flute-to-diameter ratio and short drill length make it a practical choice for CNC machining centers, manual mills, and drill press setups where tool deflection must be minimized. The spiral flute geometry with a right-hand cut handles chip clearing on through-holes and blind holes in production and job-shop settings alike.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous and non-ferrous drilling
• 118-degree faceted point angle with web-thinned, parallel web for reduced thrust and clean entry
• Bright/uncoated finish suitable for use with cutting fluids or dry on non-ferrous materials
• Straight-cylindrical shank (0.4844 inches) for secure chuck retention
• Short screw machine length (3 inches overall) minimizes deflection in tight setups
• Right-hand spiral flute geometry promotes efficient chip evacuation
• Diameter tolerance held to +0.0000 to -0.0005 inches for consistent hole sizing

Compatibility

Designed for use in standard drill chucks and collet systems accepting a 0.4844-inch straight-cylindrical shank. Rated for drilling cast iron, non-ferrous metal, stainless steel, and steel workpieces. Part of the M.A. FORD Series 206 screw machine length carbide drill line.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tooling technicians familiar with speeds, feeds, and workholding requirements for carbide cutting tools. Ensure the machine spindle and chuck are free of runout before seating the shank to protect the carbide from chipping due to lateral loading. Coolant-through is not supported on this bit; apply cutting fluid externally when drilling stainless steel or cast iron. Never use carbide drills in hand-held drill applications where vibration and off-axis forces can cause brittle fracture.