Chicago-latrobe 41777 Letter G Jobber Drill Bit Tin Hss

Product Description

The CHICAGO-LATROBE 41777 is a jobber-length drill bit designed for high-performance drilling in ferrous metals and hard materials. Sized at Letter G (0.2610 inches decimal), it features a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. The flutes are spiral with a regular helix, running 2.875 inches in length along a 4.125-inch overall body. The TiN (Titanium Nitride) coating increases surface hardness and extends tool life in production drilling applications. The two-flute design promotes efficient chip evacuation. This bit is built to NAS 907 Type B standards and is classified as heavy duty grade, making it a dependable choice for licensed tradespeople and machining professionals.

This drill bit is suited for drilling cast iron, stainless steel, and carbon steel in both shop and field environments. The straight-cylindrical shank with a 0.2610-inch diameter seats securely in standard drill chucks. The web-thinned, tapered web configuration reduces cutting resistance when breaking through hard or work-hardened materials. Typical applications include fabrication shops, maintenance and repair operations, and mechanical contractors drilling through structural steel, pipe fittings, and similar components. The bit ships individually and is intended for use in hand drills, drill presses, and milling machine setups requiring a jobber-length bit in the G-size range.

Key Features

• Letter G size — 0.2610 inches decimal diameter with a tolerance of -0.0010 to 0.0000 inches
• 135-degree split point reduces drill walking and entry thrust on hard metals
• TiN (Titanium Nitride) coating for increased surface hardness and extended tool life
• Web-thinned, tapered web lowers cutting resistance in cast iron and stainless steel
• NAS 907 Type B standard — heavy duty grade for production and demanding MRO use
• Right-hand cut, 2-flute spiral design promotes consistent chip clearance

Compatibility

Designed for use in standard drill chucks accepting a straight-cylindrical shank. Primary workpiece materials include cast iron, stainless steel, and carbon steel. Belongs to the CHICAGO-LATROBE Series 150ASP-TN family of TiN-coated jobber-length drill bits.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists, fabricators, or mechanical tradespeople familiar with proper drilling procedures. Secure the straight-cylindrical shank firmly in the chuck before operation and verify the workpiece is clamped or fixtured to prevent movement. Apply appropriate cutting fluid when drilling stainless steel or other work-hardening alloys to maintain bit temperature and edge life. Do not exceed the recommended RPM range for the material and bit diameter, and avoid excessive feed pressure that can deflect or snap a jobber-length bit.