Chicago-latrobe 41771 Letter a Hss Tin Drill Bit 135

Product Description

The CHICAGO-LATROBE 41771 is a jobber-length drill bit sized to Letter A (0.2340 inches) and built for high-performance metal drilling in trade and industrial applications. Manufactured from high speed steel with a titanium nitride (TiN) coating, it features a 135-degree split point that reduces walking and lowers thrust on entry. The regular spiral flute evacuates chips efficiently, and the web-thinned, tapered web design extends tool life under demanding cutting conditions. Overall length is 3.875 inches with a 2.625-inch flute length. The straight-cylindrical shank measures 1.25 inches in diameter, making it compatible with standard drill chucks. This bit is rated heavy duty and meets NAS 907 Type B standards.

This drill bit is suited for production and maintenance drilling in ferrous materials. Primary workpiece materials include cast iron, stainless steel, and carbon steel. The TiN coating reduces friction and increases surface hardness, extending service intervals when drilling harder alloys. Typical installation scenarios include fabrication shops, mechanical contractors, and field service work where a reliable, precision-ground drill is needed for tight-tolerance holes in metal components. Right-hand cut with two flutes and a regular spiral make it appropriate for use in standard drill presses, CNC equipment, and hand-held power drills.

Key Features

• Letter A size — 0.2340 inches diameter — with diameter tolerance of -0.0007 to 0.0000 inches
• 135-degree split point reduces bit walking and cutting thrust
• Titanium nitride (TiN) coating for reduced friction and extended tool life
• Web-thinned tapered web construction for improved chip clearance
• Meets NAS 907 Type B standard — rated for heavy-duty use
• Right-hand cut, 2-flute regular spiral for efficient chip evacuation

Compatibility

Designed as an OEM-style jobber-length drill bit for use in standard drill chucks accepting a straight-cylindrical shank; rated for cast iron, stainless steel, and carbon steel workpieces per NAS 907 Type B specification.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists, maintenance technicians, or licensed trade professionals familiar with rotary cutting tools. Secure the straight-cylindrical shank firmly in the drill chuck before operation and verify chuck key is removed before powering the machine. Use appropriate cutting fluid or coolant when drilling stainless steel or hardened alloys to prevent premature edge wear. Always wear eye protection and follow applicable shop safety procedures when operating drill presses or power hand drills.