Chicago-latrobe 49400 Screw Machine Drill Bit Wire 30 Hss

Product Description

The CHICAGO-LATROBE 49400 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from high speed steel with a coated finish, it carries a wire gauge size of 30, which equals 0.1285 inches in decimal. The 135-degree split point reduces walking and lowers thrust at entry, making it well suited for work on hard or abrasive ferrous materials. The parallel web with web-thinning further reduces cutting resistance. At 1-15/16 inches overall length with a 15/16-inch flute, this stub-length geometry provides added rigidity for accurate hole placement in heavy-duty applications.

This bit is used in screw machine operations, CNC drilling, and manual drill press work where a short, stiff tool is needed to hold position and resist deflection. The straight cylindrical shank fits standard drill chucks without adaptation. Primary target materials are cast iron and steel, covering a broad range of production machining, maintenance, and fabrication tasks. The regular spiral flute promotes chip evacuation without aggressive curl, which helps maintain hole quality in interrupted cuts or deep-for-diameter holes common in these materials.

Key Features

• Wire size 30 (0.1285 inches) with a tight diameter tolerance of +0.0000 to -0.0007 inches for consistent fit
• 135-degree split point reduces entry thrust and minimizes center-punch dependency
• Web-thinned parallel web lowers cutting resistance in hard ferrous materials
• Screw machine (stub) length provides extra rigidity to resist deflection and improve hole accuracy
• High speed steel construction with coated finish for extended tool life in production environments
• Right-hand spiral flute with 2 flutes promotes efficient chip removal
• Meets NAS 907 specification and ISO standards for heavy-duty drill bit grade

Compatibility

Designed as a heavy-duty OEM-style screw machine length drill bit for use in cast iron and steel applications; fits any standard drill chuck accepting a straight cylindrical shank at this diameter range.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance technicians familiar with drill press or CNC equipment operation. Secure the shank fully in the chuck and verify runout before cutting. Power down and lock out equipment before changing bits or clearing chips. Do not exceed the recommended feed and speed parameters for high speed steel tooling in the material being drilled.