Chicago-latrobe 49407 Screw Machine Drill Bit 0.104 in Hss

Product Description

The CHICAGO-LATROBE 49407 is a screw machine length drill bit designed for high-production drilling in metal fabrication, mechanical assembly, and general machining applications. Built from high speed steel with a coated finish, this bit measures 0.104 inches (No. 37 wire gauge) in diameter and features a 135-degree split point for fast penetration and reduced walking on entry. The shortened screw machine length body provides added rigidity compared to jobber-length bits, making it a practical choice for drill press and CNC turret work where stub-length tooling is preferred. Web thinning further reduces thrust requirements when drilling into tough materials.

This bit is suited for drilling cast iron and steel in both production shop and field service environments. The right-hand spiral flute geometry handles standard through-hole and blind-hole drilling tasks. The straight-cylindrical shank seats securely in standard drill chucks and quick-change holders. Series 159 heavy-duty grade construction supports demanding cycle rates where bit longevity and dimensional consistency are required. Machinists, tool-and-die techs, and maintenance trades working with steel fabrication will find this bit appropriate for repetitive small-diameter hole work.

Key Features

• 0.104 inches (No. 37 wire gauge) diameter with tight tolerance of +0.0000 to -0.0005 inches
• 135-degree split point reduces thrust and minimizes bit walk on hard surfaces
• Web-thinned parallel web lowers cutting resistance in cast iron and steel
• Screw machine length body increases rigidity over jobber-length alternatives
• High speed steel construction with coated finish for extended tool life
• Meets NAS 907 and ISO standards for heavy-duty drilling applications

Compatibility

Designed as a heavy-duty screw machine length replacement drill bit for use in standard drill chucks and quick-change holders accepting straight-cylindrical shanks; compatible with primary workpiece materials including cast iron and steel as specified by the manufacturer.

Installation Notes

Install into a properly sized drill chuck or quick-change holder rated for the shank diameter and ensure the chuck is fully tightened before operation. De-energize or lock out all power to the drill press, CNC turret, or hand drill before changing bits. Use appropriate cutting fluid or coolant for steel and cast iron applications to maintain bit life and surface finish. Inspect the cutting edges and point geometry before each use and replace if chipping or excessive wear is observed.