M.a. Ford. 20517720T Screw Machine Drill Bit 0.1772 in

Product Description

The M.A. FORD. 20517720T is a screw machine length drill bit designed for high-precision drilling in demanding trade and industrial applications. Built from solid carbide with a coated finish, it delivers exceptional hardness and wear resistance compared to high-speed steel alternatives. The bit measures 0.1772 inches (4.50 mm) in diameter with an overall length of 2.2047 inches (56.00 mm). The 135-degree split point reduces walking and decreases the thrust required to start a hole, making it well suited for production drilling and precision machining work. Right-hand cut with a slow spiral flute, this bit is installed and operated by machinists and tool-and-die professionals on lathes, drill presses, and CNC equipment.

This drill bit is intended for use on a range of primary workpiece materials including cast iron, non-ferrous metals, stainless steel, and steel. The screw machine length format provides a shorter, stiffer profile than jobber-length bits, reducing deflection and improving hole location accuracy. It is a common choice for close-tolerance production environments where consistent hole diameter and finish quality are required. The straight-cylindrical shank seats securely in standard drill chucks and collets without modification.

Key Features

• Solid carbide construction for superior hardness and extended tool life in ferrous and non-ferrous materials
• 135-degree split point minimizes drill walk and reduces entry thrust
• Web-thinned parallel web configuration improves chip clearance and cutting efficiency
• Slow spiral flute geometry optimized for cast iron, stainless steel, and steel
• Screw machine length (3xD flute-to-diameter ratio) provides added rigidity and reduced deflection
• Diameter tolerance held to +0.0000 to -0.0005 inches for consistent, repeatable hole sizing

Compatibility

Designed as an OEM-style replacement or direct-use tooling for standard drill chucks and collets accepting a 0.1772-inch straight-cylindrical shank, compatible with drill presses, lathes, and CNC machining centers used in metal fabrication and production environments.

Installation Notes

This bit is installed by machinists and tooling professionals in machine shop and production settings. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the straight shank fully and evenly in the chuck or collet and verify runout before beginning a drilling operation. Do not exceed the recommended feed and speed parameters for the workpiece material being drilled.