M.a. Ford 20508100 Screw Machine Drill Bit 46 Wire

Product Description

The M.A. FORD 20508100 is a screw machine length drill bit sized for wire gauge 46, equivalent to 0.0810 inches in diameter. Manufactured from solid carbide throughout, it features a 135-degree split point with web thinning for fast, accurate starts and reduced thrust on entry. The slow spiral flute geometry is optimized for chip evacuation in challenging materials. With a straight cylindrical shank of the same 0.0810-inch diameter, it seats securely in standard drill chucks and quick-change holders. Overall length is 1.75 inches, keeping it rigid and minimizing deflection in small-hole drilling applications where positional accuracy matters.

This bit is intended for production and maintenance drilling in cast iron, non-ferrous metals, stainless steel, and general steel. The screw machine length format is common in CNC drilling centers, manual drill presses, and benchtop machines where a short, stiff tool is preferred over a jobber-length bit. The 0.75-inch flute length supports a 3xD depth-to-diameter ratio, making it practical for shallow through-holes and countersink prep work typical in fabrication and machining environments. Licensed machinists, tool-and-die technicians, and maintenance mechanics are the primary users of this product.

Key Features

• Solid carbide construction for hardness and wear resistance in ferrous and non-ferrous materials
• 135-degree web-thinned split point reduces walking and lowers entry thrust
• Slow spiral flute geometry promotes chip clearing in cast iron and stainless steel
• Screw machine length body limits deflection and improves hole location accuracy
• Single-margin design with straight cylindrical shank for straightforward chuck mounting
• Bright uncoated finish suitable for use with cutting fluid or dry in appropriate materials

Compatibility

Designed for use in standard drill chucks, collet holders, and quick-change tooling systems that accept a 0.0810-inch straight cylindrical shank. Suited for drilling cast iron, non-ferrous metal, stainless steel, and steel workpieces as noted in the product specifications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with small-diameter carbide tooling. Secure the shank fully in the chuck or collet before applying power, and confirm runout is within acceptable limits before drilling, as carbide is brittle and sensitive to lateral loading. Apply appropriate cutting fluid when drilling stainless steel or hardened steel to extend tool life and prevent work hardening at the hole entrance. Avoid side pressure or interrupted cuts that could cause chipping or breakage of the carbide body.