Chicago-latrobe 49404 Screw Machine Drill Bit 0.111 in

Product Description

The CHICAGO-LATROBE 49404 is a screw machine length drill bit designed for high-production drilling in metal fabrication and machining applications. Built from coated high speed steel, this bit features a 135-degree split point for fast penetration and reduced walking on startup. The straight-cylindrical shank seats securely in standard drill chucks and quick-change holders. At 0.111 inches in diameter (Wire Size 34), it is sized for precision hole work in cast iron, steel, and similar ferrous materials. The web-thinned, parallel web configuration reduces thrust load, making it well suited for heavy-duty production environments where consistent hole quality matters.

This bit is built for screw machine and production drilling operations where short flute length and rigid construction improve accuracy in tight setups. The regular spiral flute provides reliable chip evacuation in cast iron and steel workpieces. Licensed machinists, toolmakers, and maintenance technicians will find this bit appropriate for CNC screw machines, drill presses, and hand-held drill applications requiring a compact, stiff cutting tool. It complies with NAS 907 specifications and meets ISO standards, making it suitable for aerospace and industrial production work where dimensional accountability is required.

Key Features

• 0.111 inch diameter (Wire Size 34) with a tight tolerance of +0.0000 to -0.0005 inches
• 135-degree split point reduces thrust and eliminates pilot dimpling on flat surfaces
• Coated high speed steel construction for extended tool life in ferrous materials
• Web-thinned parallel web lowers cutting resistance for heavy-duty production use
• Screw machine length (1-7/8 inches overall, 7/8 inch flute) delivers added rigidity over jobber-length bits
• Meets NAS 907 specification and ISO standards for dimensional consistency

Compatibility

Designed for drilling cast iron and steel workpieces. Primary workpiece materials listed are cast iron and steel. Fits standard straight-shank drill chucks and screw machine tool holders accepting a 0.111 inch shank diameter.

Installation Notes

Installation and use should follow standard machine shop safety practices. Secure the shank fully in the drill chuck or collet before operation, and ensure the spindle is at a complete stop before tool changes. Use appropriate cutting fluid or coolant for the workpiece material to maintain tool life, noting this bit does not support through-coolant delivery. Inspect the cutting edges for wear or chipping before each use, and replace the bit when diameter tolerance can no longer be held.