Import BDNA--20927-1 Drill Bit 31/64 Inch Hss Weldon

Product Description

The IMPORT BDNA--20927-1 is a mechanics drill bit designed for general-purpose metal drilling in demanding trade and industrial applications. It measures 31/64 inches (0.4844 inches decimal) in diameter with a 4-7/8 inch overall length and a 3-1/4 inch flute length. The 135-degree split point reduces walking on contact and allows drilling without a center punch on most metal surfaces. Constructed from high-speed steel with an oxide finish, this bit is built for repeated use across a range of ferrous metals. The Weldon flat shank with three flats provides positive engagement in compatible chucks, minimizing slippage under torque.

This drill bit is suited for use on carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel stock. It fits standard drilling applications in fabrication shops, maintenance environments, and field service work where consistent, accurate hole sizing in metal is required. The right-hand spiral flute design with web-thinned, parallel web configuration supports efficient chip evacuation during through-hole drilling. This bit is a single-piece, individually packaged unit appropriate for bench drill presses and handheld drill motors equipped with Weldon-compatible chucks.

Key Features

• 135-degree split point reduces drill walking and eliminates the need for center-punching on most metals
• High-speed steel construction provides heat resistance during extended drilling cycles
• Oxide finish helps resist corrosion and light surface wear
• Weldon flat shank with three flats ensures positive chuck engagement and reduces bit slippage
• Web-thinned parallel web reduces thrust force required during drilling
• Right-hand cut with regular spiral flutes for efficient chip removal

Compatibility

Designed for use in drill presses and handheld drill motors equipped with Weldon flat shank chucks. Suitable for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel workpieces.

Installation Notes

Secure the Weldon flat shank firmly in a compatible three-flat chuck before operation to prevent rotation or pullout under load. Always reduce feed pressure as the bit exits the workpiece to avoid grabbing. Power down and disconnect the drill motor before changing bits or inspecting the cutting edge. Wear appropriate eye protection and secure the workpiece before drilling.