M.a. Ford 20531250T 5/16 in Carbide Screw Machine Drill Bit

Product Description

The M.A. FORD 20531250T is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Built from solid carbide, this bit measures 0.3125 inches (5/16 inch) in diameter with an overall length of 2-13/16 inches and a flute length of 1-5/8 inches. The 135-degree split point and web-thinned geometry reduce walking at entry and lower thrust requirements, making it well-suited for production drilling and precision work. It is installed and used by machinists, tool and die tradespeople, and maintenance technicians requiring tight-tolerance hole-making in tough materials.

The 20531250T is designed for drilling cast iron, non-ferrous metals, stainless steel, and steel. Its screw machine length body fits standard drill chucks and CNC machining centers where shorter flute-to-diameter ratios improve rigidity and reduce deflection. The slow spiral flute design promotes chip evacuation in materials that produce long, stringy chips, such as stainless steel. This bit is appropriate for both manual drilling setups and automated production environments requiring consistent hole quality and repeatable diameter tolerance.

Key Features

• Solid carbide construction for extended tool life in ferrous and non-ferrous materials
• 135-degree split point with web thinning reduces entry thrust and prevents bit walking
• Slow spiral flute promotes controlled chip evacuation in stainless steel and cast iron
• Parallel web configuration maintains consistent core strength along the flute length
• Straight-cylindrical shank at 0.3125 inches diameter fits standard chucks without adapters
• Diameter tolerance of +0.0000 to -0.0005 inches supports tight-tolerance hole specifications
• 3xD flute-to-diameter ratio provides added rigidity in short-reach drilling setups

Compatibility

The M.A. FORD Series 205 screw machine length drill bit is designed for use in standard drill chucks, CNC machining centers, and drill presses that accept a 0.3125-inch straight-cylindrical shank. Suitable for primary workpiece materials including cast iron, non-ferrous metal, stainless steel, and steel.

Installation Notes

Installation and tool changes should be performed with the machine powered down and the spindle fully stopped. Secure the straight-cylindrical shank firmly in the chuck or collet before operation to prevent runout. Solid carbide tooling is brittle and should not be subjected to side loading or interrupted cuts beyond the tool rating. Follow applicable workplace safety standards and machine manufacturer guidelines for speeds, feeds, and coolant use.