M.a. Ford. 20513780T Screw Machine Drill Bit 0.1378 in

Product Description

The M.A. FORD. 20513780T is a screw machine length drill bit designed for precise, short-reach drilling in production and machining environments. Built from solid carbide with a coated finish, it measures 0.1378 inches (3.50 mm) in diameter and features a 135-degree split point for accurate self-centering entry with reduced thrust. The slow spiral flute geometry and web-thinned parallel web configuration make it well suited for controlled chip evacuation in demanding materials. Overall length is 1.9291 inches (49.00 mm), with a flute length of approximately 0.9449 inches (24.00 mm). This bit is intended for right-hand cutting with a straight-cylindrical shank and is sold individually.

The 20513780T is built for machining cast iron, non-ferrous metals, stainless steel, and steel. Its screw machine length profile makes it a practical choice for CNC machining centers, drill presses, and turret lathes where rigidity and runout control matter. The 3xD flute-to-diameter ratio is appropriate for shallow-to-moderate depth holes in materials that generate significant cutting forces. Machinists, tool-and-die professionals, and production shop technicians are the primary users of this Series 205 bit.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous and non-ferrous materials
• 135-degree split point promotes self-centering and reduces walking on entry
• Slow spiral flute with web-thinned parallel web for controlled chip flow
• Screw machine length (1.9291 inches overall) provides added stiffness over jobber-length bits
• Right-hand cut with straight-cylindrical shank for standard chuck compatibility
• Diameter tolerance held to +0.0000 to -0.0005 inches for close-tolerance hole applications

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for standard straight-shank chuck systems. Primary workpiece materials listed by the manufacturer are cast iron, non-ferrous metal, stainless steel, and steel.

Installation Notes

Installation of this bit requires a compatible straight-shank chuck sized for 0.1378-inch shanks. Ensure the machine spindle and chuck are clean and free of debris before seating the bit to maintain concentricity and prevent premature breakage. Coolant-through is not supported on this bit, so external coolant or cutting fluid should be applied according to shop practice for the workpiece material. Always verify spindle speed and feed rate against the manufacturer's recommended parameters for solid carbide tooling before beginning a cut.