Chicago-latrobe 41793 Jobber Drill Bit Letter W Hss Tin

Product Description

The CHICAGO-LATROBE 41793 is a jobber length drill bit in Letter W size, equivalent to 0.3860 inches in decimal, designed for high-performance metal drilling in trade and industrial applications. Built from high speed steel with a titanium nitride (TiN) coating, this bit delivers extended tool life and heat resistance in demanding materials. The 135-degree split point starts without a center punch and reduces walking on hard surfaces. At 5.125 inches overall length with a 3.75-inch flute, this is a standard jobber proportion suited to drill press and hand drill use by machinists, pipefitters, and maintenance technicians.

This bit is engineered for cutting cast iron, stainless steel, and carbon steel — materials commonly encountered in mechanical, HVAC, and plumbing rough-in work. The Series 150ASP-TN designation indicates a heavy-duty, web-thinned construction meeting NAS 907 Type B standards. The straight-cylindrical shank with a 1.375-inch shank diameter fits standard drill chucks and is compatible with bench drill presses and portable electric drills. Right-hand spiral flute geometry clears chips efficiently on through-hole drilling applications.

Key Features

• Letter W size — 0.3860 inches decimal equivalent for precise hole sizing
• 135-degree split point reduces thrust and eliminates walking on hard stock
• Titanium nitride (TiN) coating increases surface hardness and extends tool life in ferrous materials
• Web-thinned, tapered web construction reduces cutting resistance in stainless steel and cast iron
• Regular spiral, 2-flute design promotes efficient chip evacuation on deep holes
• Meets NAS 907 Type B specification for heavy-duty jobber drill performance

Compatibility

Rated for primary use in cast iron, stainless steel, and steel workpieces. Designed as an OEM-style jobber length drill bit compatible with standard straight-shank drill chucks on bench drill presses and portable drills.

Installation Notes

Installation is performed by machinists, maintenance technicians, and trade professionals using standard drill press or portable drill equipment. Secure the workpiece firmly before drilling and confirm the chuck is tightened to full engagement on the straight shank. When drilling stainless steel or cast iron, use a cutting fluid or coolant to preserve coating life and reduce heat buildup. Inspect the cutting edges for wear before reuse — a dull TiN-coated bit should be replaced, not field-sharpened without proper grinding equipment.