M.a. Ford. 20509950A Screw Machine Length Drill Bit

Product Description

The M.A. FORD. 20509950A is a screw machine length drill bit designed for precision hole-making in tight-tolerance applications. Manufactured from solid carbide and finished with a coating, this bit features a 135-degree split point with web thinning for reduced thrust and improved centering on entry. The 0.0995 inch diameter corresponds to wire gauge size 39. With a slow spiral flute geometry and a straight-cylindrical shank, this bit is suited for short-reach drilling operations where rigidity and accuracy are critical. It is sold individually and installed by machinists, toolroom technicians, and metalworking professionals.

This drill bit is optimized for use in CNC machining centers, drill presses, and screw machine setups where a compact flute-to-length ratio is required. The Series 205 geometry with a 3xD flute-to-diameter ratio keeps the tool short and stiff, reducing deflection during drilling. Primary workpiece materials include cast iron, non-ferrous metals, stainless steel, and steel. The single-margin design and slow spiral promote chip evacuation in these materials without sacrificing hole finish quality.

Key Features

• Solid carbide construction for rigidity and wear resistance in metalworking applications
• 135-degree drill point angle with web thinning for self-centering entry and reduced thrust
• Slow spiral flute geometry promotes controlled chip evacuation in ferrous and non-ferrous materials
• Straight-cylindrical shank at 0.0995 inches for standard collet and chuck compatibility
• Right-hand cut with 2 flutes and a single margin for precision bore geometry
• Diameter tolerance held to +0.0000 to -0.0005 inches for tight-tolerance hole requirements

Compatibility

Designed as an OEM-style replacement and standard-service drill bit for screw machine and CNC drilling operations in cast iron, non-ferrous metal, stainless steel, and steel workpieces requiring a wire gauge 39 diameter hole.

Installation Notes

This bit is installed by machinists and toolroom technicians using standard collets or drill chucks compatible with a straight-cylindrical shank. Ensure the spindle and workpiece are secured before engaging the cutting tool. No coolant-through capability is present on this bit, so external coolant or cutting fluid should be applied as required by the workpiece material and shop practice. Follow applicable machine guarding and PPE requirements per shop safety standards.