M.a. Ford. 20503940T Screw Machine Drill Bit Solid Carbide

Product Description

The M.A. FORD. 20503940T is a screw machine length drill bit engineered for precision drilling in demanding industrial and machining applications. Built from solid carbide with a coated finish, this bit delivers the rigidity and wear resistance required when working in cast iron, stainless steel, steel, and non-ferrous metals. The 135-degree split point reduces walking at entry and lowers thrust force needed to start the cut. At 1.0 mm (0.0394 inches) in diameter with a 1.4961-inch overall length, it is sized for tight-tolerance work where a standard jobber bit is too long for controlled, accurate drilling. Licensed machinists and tool-and-die professionals are the primary users of this Series 205 bit.

This drill bit is designed for screw machine and short-hole drilling operations where rigidity and runout control are critical. The slow spiral flute geometry and parallel web configuration make it well suited for materials that require a controlled chip evacuation rate, including stainless steel and cast iron. The straight-cylindrical shank seats securely in collet chucks, drill press spindles, and CNC tool holders with standard round-shank bores. It is commonly used in production machining environments, job shops, and precision fabrication settings.

Key Features

• Solid carbide construction for maximum rigidity and wear resistance in hard and abrasive materials
• 135-degree split point reduces entry thrust and minimizes drill walk on flat or curved surfaces
• Slow spiral flute with parallel web supports controlled chip flow in cast iron, stainless steel, and non-ferrous metals
• Web-thinned geometry reduces cutting resistance without compromising core strength
• Screw machine (stub) length provides greater stiffness than jobber-length bits at this diameter
• Coated finish extends cutting life in high-cycle production environments

Compatibility

Designed as an OEM-style replacement or direct substitute for screw machine length solid carbide drill bits in the 0.0394-inch (1.00 mm) diameter class, compatible with any tool holder accepting a 0.0394-inch straight-cylindrical shank.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or tooling technicians. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Seat the straight-cylindrical shank fully in the collet or chuck and confirm runout with an indicator before beginning production drilling. At this diameter, excessive feed rate or lateral force will result in bit breakage - follow the tooling manufacturer's recommended speeds and feeds for the workpiece material.