Chicago-latrobe 42699 No. 29 Jobber Drill Bit Tialn Hss

Product Description

The CHICAGO-LATROBE 42699 is a jobber length drill bit designed for high-performance drilling in titanium and other hard materials. It is manufactured from high speed steel with a TiAlN coating, which extends tool life and supports elevated cutting speeds. The bit features a 135-degree split point for fast penetration and reduced walking on entry, and a two-flute regular spiral design for efficient chip evacuation. The overall length is 2.875 inches with a flute length of 1.75 inches. It is suited for use in CNC drilling centers, drill presses, and hand-held power tools in aerospace, defense, and precision machining applications. Installation and use are handled by machinists and tool-and-die professionals.

The 42699 is sized at wire gauge No. 29, equivalent to 0.1360 inches in diameter. Its web-thinned, tapered web construction reduces thrust requirements during drilling, making it especially effective in titanium per NAS 907 Type B specification. The straight-cylindrical shank, measuring 1.125 inches in length, seats securely in standard drill chucks and collets. It is intended for precision hole work in aerospace-grade materials and production environments where consistent diameter tolerance is required. The drill bit diameter tolerance is held to -0.0007 to 0.0000 inches, ensuring close-fit hole accuracy.

Key Features

• TiAlN coating increases surface hardness and heat resistance for drilling titanium and hard alloys
• 135-degree split point reduces thrust and eliminates the need for a center punch on most surfaces
• Web-thinned tapered web lowers cutting resistance and improves chip flow
• Meets NAS 907 Type B specification for aerospace drilling applications
• Right-hand cut, two-flute regular spiral for reliable chip evacuation
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed for use in drill presses, CNC machining centers, and power drills equipped with standard chucks or collets accepting a straight-cylindrical shank. Rated for primary workpiece material of titanium per NAS 907 Type B; also suitable for other ferrous and non-ferrous hard materials in precision machining operations.

Installation Notes

Install and remove drill bits only when the spindle is fully stopped and power is locked out. Ensure the shank is fully seated and the chuck or collet is tightened to the tool holder manufacturer specifications before initiating a cut. Use appropriate cutting fluid or coolant compatible with titanium when drilling aerospace-grade materials to manage heat buildup. Inspect the cutting edges and coating for wear before each use and replace the bit if chipping, dulling, or coating breakdown is observed.