Import -20870-U Letter U Mechanics Drill Bit Hss

Product Description

The IMPORT -20870-U is a Letter U mechanics drill bit designed for general-purpose metal drilling in professional shop and field applications. Built from high-speed steel with an oxide finish, it features a 135-degree split point that self-centers on contact and reduces the need for a center punch. The Weldon flat shank with three flats provides positive drive and prevents slipping in compatible chucks. At 4.25 inches overall length with a 2.6875-inch flute, this bit is sized for standard mechanics drilling tasks where control and chip evacuation matter.

This bit is suited for right-hand cutting in a range of ferrous materials including carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel stock. The mechanics length format keeps the bit rigid and maneuverable in tight spaces common to machine shop work, maintenance environments, and production drilling setups. The spiral flute type with a parallel web configuration and web-thinned point supports consistent chip clearing during through-hole and blind-hole operations.

Key Features

• Letter U size — 0.3680 inch decimal equivalent
• 135-degree split point for self-centering entry without center punch
• High-speed steel construction with oxide coating for wear resistance
• Weldon flat shank with three flats for positive drive in compatible chucks
• Web-thinned, parallel web configuration for reduced thrust and improved chip flow
• Right-hand cut, regular spiral flute — general-purpose performance across common ferrous materials

Compatibility

Designed for use with drill chucks and tool holders accepting a Weldon flat shank. Suitable for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel workpieces.

Installation Notes

Install and service by machinists, tool-and-die technicians, or qualified maintenance mechanics. Secure the Weldon shank fully in a compatible set-screw chuck or holder before operation and verify all set screws are torqued to the holder manufacturer specification. Power down and lock out the machine before changing bits. Do not run this bit in reverse or use it on non-ferrous materials without confirming suitability for the workpiece.