Import -20870-M Mechanics Drill Bit Letter M Hss

Product Description

The IMPORT -20870-M is a Letter M mechanics drill bit designed for general-purpose drilling in metalworking applications. Built from high-speed steel with an oxide finish, it features a 135-degree split point that reduces walking and allows self-centering on contact. The Weldon flat shank with three flats provides a secure, slip-resistant grip in compatible chucks. At 0.2950 inches in diameter with an overall length of 3.875 inches and a flute length of 2.375 inches, this bit is sized for typical hand-drill and drill-press setups used by machinists and maintenance mechanics.

This bit is suited for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel stock. The spiral flute geometry and web-thinned parallel web configuration promote efficient chip evacuation during through-hole and blind-hole operations. It is commonly used in maintenance, repair, and fabrication environments where a reliable general-purpose drill bit is needed across a range of ferrous materials.

Key Features

• Letter M diameter — 0.2950 inches for precise sizing in standard drill charts
• 135-degree split point reduces drill walking and improves hole entry accuracy
• High-speed steel construction handles carbon steel, cast iron, and stainless steel
• Weldon flat shank with three flats prevents rotation slippage in the chuck
• Web-thinned parallel web reduces cutting resistance and improves chip flow
• Oxide coating provides basic corrosion resistance and reduces friction during cutting

Compatibility

Designed as a general-purpose replacement mechanics drill bit compatible with Weldon flat shank drill chucks and holders used in standard hand drills and drill presses for ferrous metal drilling applications.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance mechanic familiar with drill press or hand-drill operation. Ensure the chuck and Weldon shank interface is fully secured before operation to prevent bit slippage. Appropriate cutting fluid or coolant should be applied externally, as this bit does not support coolant-through operation. Always wear appropriate PPE including eye protection when drilling metal stock.