Import -20916-5 Mechanics Drill Bit 5/16 in Hss

Product Description

The IMPORT -20916-5 is a mechanics-length drill bit designed for general-purpose drilling in metal and ferrous materials. It measures 5/16 inch (0.3125 inch) in diameter with a 4-inch overall length and a 2.5-inch flute length. The 135-degree split point geometry reduces walking at startup and lowers thrust required to enter the workpiece. Constructed from high-speed steel with an oxide finish, this bit is built for shop and field use by machinists, pipefitters, ironworkers, and maintenance technicians who need a reliable, right-hand-cut drill for everyday metal removal tasks.

This bit is suited for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloys, and stainless steel. The mechanics-length format offers a shorter, stiffer profile compared to jobber-length bits, making it a preferred choice in tight-clearance setups or on drill presses where reduced deflection matters. The three-flat Weldon shank locks into compatible chuck holders and prevents slipping under torque. Web-thinned geometry at the tip reduces cutting resistance on harder alloys.

Key Features

• 135-degree split point reduces bit walking and lowers required drill thrust
• High-speed steel construction handles carbon steel, cast iron, stainless steel, and high-alloy materials
• Weldon flat shank with three flats resists slipping in compatible holders
• Mechanics-length body provides added rigidity over jobber-length bits
• Web-thinned, parallel web design reduces cutting resistance on tough alloys
• Oxide finish provides basic corrosion and heat resistance during use

Compatibility

Designed as a general-purpose mechanics-length drill bit compatible with Weldon-shank drill chucks and holders accepting a 5/16-inch round shank with three flats.

Installation Notes

Installation should be performed by qualified machinists or trade professionals familiar with drill press or handheld power tool operation. Secure the Weldon shank fully in the holder before applying power, and verify the set screws engage the flats to prevent rotation under load. Always wear appropriate eye protection and secure the workpiece before drilling. For stainless steel or high-alloy materials, use a cutting fluid to extend bit life and reduce heat buildup.