Import -20870-H Letter H Mechanics Drill Bit Hss

Product Description

The IMPORT -20870-H is a Letter H mechanics drill bit designed for general-purpose drilling in metalworking applications. It is manufactured from high-speed steel with an oxide finish and features a 135-degree split point that reduces walking and allows for fast, accurate starts without a center punch. The Weldon flat shank with three flats provides a secure, slip-resistant grip in compatible chucks. At 0.2660 inches in decimal diameter, this bit covers the standard Letter H size. Right-hand spiral flutes with a parallel web configuration and web-thinned geometry reduce cutting resistance and improve chip evacuation.

This mechanics-length drill bit is suited for shop and field use in metalworking environments. The shorter mechanics-length body provides rigidity for drilling in tight or confined spaces on machine setups, fixtures, and fabrication work. Primary workpiece materials include carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel applications. It is a standard stock item sold individually with a minimum order quantity of 3 units.

Key Features

• Letter H size — 0.2660 inch decimal diameter for precise hole sizing
• 135-degree split point reduces drill walk and eliminates need for center punching
• High-speed steel construction handles carbon steel, stainless steel, cast iron, and high alloy steel
• Oxide finish provides basic lubricity and surface protection during cutting
• Weldon flat shank with 3 flats prevents chuck slippage under torque
• Web-thinned parallel web reduces thrust force and improves penetration rate

Compatibility

Designed as a general-purpose mechanics-length drill bit compatible with Weldon flat shank chucks and drill presses, lathes, and milling machines that accept this shank style.

Installation Notes

This bit is installed by a machinist or metalworker into a Weldon-compatible chuck and should be seated fully against the flat before tightening set screws. Ensure the workpiece is secured before drilling to prevent movement. Use appropriate cutting fluid when drilling stainless steel or high alloy materials to extend tool life. Inspect the cutting edge for wear or chipping before each use.