Chicago-latrobe 45712 Jobber Drill Bit Wire 42 Hss

Product Description

The CHICAGO-LATROBE 45712 is a jobber-length twist drill bit in wire gauge size 42, with a decimal diameter of 0.0935 inches. Built from high-speed steel with an oxide coating, it features a 135-degree split point and a tapered, web-thinned core for reduced thrust and cleaner entry. The 2-flute spiral flute design with regular helix promotes efficient chip evacuation. At 2.25 inches overall length with a 1.25-inch flute length, this bit is sized for precision work in tight quarters. It meets NAS 907 Type B standards and is rated as heavy-duty for demanding production environments. Installation is typically performed by machinists, maintenance mechanics, or metal fabricators.

This bit is suited for drilling cast iron, stainless steel, and carbon steel in both shop and field settings. The straight-cylindrical shank seats securely in standard drill chucks and collets. The 135-degree split point self-centers on contact, reducing the need for a center punch on flat stock. The oxide finish provides mild lubricity and corrosion resistance during cutting operations. At 0.0935 inches diameter, this bit is commonly used for tapping prep, instrument-panel work, and precision hole placement in metal fabrication and maintenance applications.

Key Features

• Wire gauge size 42 with 0.0935-inch decimal diameter and diameter tolerance of -0.0005 to 0.0000 inches
• 135-degree split point with web thinning for self-centering and reduced drilling thrust
• High-speed steel construction with oxide coating for durability and mild lubricity
• Regular-helix spiral flutes for efficient chip removal in ferrous metals
• Straight-cylindrical shank (0.0935 inches) fits standard chucks and collets
• Meets NAS 907 Type B specification for high-performance, heavy-duty applications

Compatibility

Designed as an OEM-style replacement and production-grade bit compatible with standard drill chucks and collets accepting a 0.0935-inch straight-cylindrical shank. Rated for use in cast iron, stainless steel, and steel workpieces per the NAS 907 Type B specification.

Installation Notes

Installation and use should be performed by qualified machinists or mechanics familiar with small-diameter drill bits. Secure the straight-cylindrical shank firmly in a properly sized collet or keyed chuck before operation to prevent slippage and bit breakage. At this diameter, use appropriate cutting fluid for stainless steel and cast iron to extend bit life and maintain hole tolerance. Inspect the split point for chipping before each use, as small-diameter bits are susceptible to tip damage if dropped or improperly stored.