Chicago-latrobe 53875 Letter H Jobber Drill Bit Hss Tin

Product Description

The CHICAGO-LATROBE 53875 is a jobber length drill bit sized at Letter H (0.2660 inches) with a 135-degree split point and a parabolic flute profile. Built from heavy-duty high speed steel with a titanium nitride (TiN) coating, it is designed for cutting steel alloy and similarly tough ferrous materials. The overall length is 4-1/8 inches with a 2-7/8 inch flute length and a straight-cylindrical shank of 0.2660 inches in diameter. The web-thinned, tapered-web geometry reduces thrust and improves chip evacuation. This bit is part of the Series 150DHT and is intended for use by machinists, maintenance techs, and metalworking tradespeople who require consistent performance in production or field drilling operations.

This drill bit is suited for drilling steel alloy workpieces in both shop and field settings. The parabolic flute design promotes efficient chip removal during deep-hole drilling, reducing the need for peck cycles in moderate-depth applications. The TiN coating extends tool life and reduces friction at the cutting edge. Right-hand cut rotation is standard for use with conventional drill presses, hand drills, and CNC setups. The straight-cylindrical shank seats reliably in standard Jacobs-style chucks and collet holders. Typical applications include structural steel fabrication, maintenance and repair operations, and general metalworking where a letter-size bit is specified.

Key Features

• Letter H size: 0.2660 inches diameter with a tolerance of -0.0010 to 0.0000 inches
• 135-degree split point reduces walking and lowers required thrust force
• Parabolic flute geometry improves chip evacuation in steel alloy materials
• Titanium nitride (TiN) coating increases surface hardness and extends tool life
• Web-thinned, tapered-web construction reduces drill pressure at entry
• Heavy-duty high speed steel grade rated for demanding production and MRO use

Compatibility

Designed as an OEM-style jobber length drill bit for use in standard drill chucks and collet systems accepting a 0.2660-inch straight-cylindrical shank; suitable for drilling steel alloy and comparable ferrous materials as indicated by the Series 150DHT specification.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with rotary cutting tools. Secure the shank fully in the chuck or collet and verify runout before operation. Always wear appropriate eye protection and follow applicable workplace safety standards when drilling metal. Inspect the cutting edges before each use and replace the bit if chipping, excessive wear, or dimensional drift beyond tolerance is observed.