Chicago-latrobe 41615 Jobber Drill Bit 15/64 in Hss Tin

Product Description

The CHICAGO-LATROBE 41615 is a jobber-length drill bit designed for heavy-duty metal drilling applications. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, it delivers increased surface hardness and extended tool life compared to uncoated HSS bits. The 135-degree split point reduces walking on contact and lowers the thrust required to start a hole, making it well suited for hard or work-hardened materials. At 3-7/8 inches overall length with a 2-5/8-inch flute, this bit fits standard jobber-length chucks and is sized at 15/64 inch (0.2344 inch decimal). It is installed by machinists, maintenance technicians, and trade professionals who need consistent hole quality in ferrous and hard metals.

The 41615 is intended for production and maintenance drilling in cast iron, stainless steel, and carbon steel workpieces. The two-flute right-hand spiral design with a tapered web and web-thinned point clears chips efficiently in both hand-held and drill-press setups. The straight-cylindrical shank seats securely in standard three-jaw chucks. This bit is suited for use in fabrication shops, industrial maintenance, and field service where a reliable, coated HSS jobber bit is required for everyday metal-removal work.

Key Features

• TiN coating increases surface hardness and reduces friction for longer tool life in ferrous metals
• 135-degree split point starts on contact without a center punch and reduces thrust requirements
• Web-thinned, tapered web construction improves chip evacuation and reduces heat buildup
• Right-hand, two-flute regular spiral design compatible with standard drill presses and hand drills
• Straight-cylindrical shank fits conventional three-jaw chucks without adapters
• Meets NAS 907 Type B specification for heavy-duty HSS drill bit performance

Compatibility

Designed as a jobber-length replacement drill bit for use in standard three-jaw chucks accepting a straight-cylindrical shank; primary workpiece materials include cast iron, stainless steel, and carbon steel per the Series 150ASP-TN specification.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill press, milling machine, or hand drill with a compatible three-jaw chuck. Secure the shank fully in the chuck before operation and verify workpiece clamping to prevent bit walking or breakage. Appropriate cutting fluid or coolant is recommended when drilling stainless steel or other work-hardening alloys to manage heat and extend bit life. Inspect the cutting edges for wear or chipping before each use and replace the bit if the TiN coating is fully worn through at the point.