Chicago-latrobe 70216 Jobber Drill Bit Letter E 1/4 in Hss Tin

Product Description

The CHICAGO-LATROBE 70216 is a jobber-length twist drill bit sized at letter E (0.2500 inches / 1/4 inches) with a 118-degree standard point angle. Manufactured from high-speed steel with a titanium nitride (TiN) coating, this bit is engineered for general-purpose drilling in cast iron and steel. The 4-inch overall length and 2-3/4-inch flute length put it squarely in the standard jobber range, making it a go-to choice for machinists, maintenance technicians, and fabricators who need repeatable, accurate holes in ferrous materials without frequent bit changes.

Designed for general-purpose production and maintenance drilling, this bit fits comfortably in bench drill presses, drill motors, and machining centers used in metalworking shops, fabrication facilities, and industrial maintenance environments. The TiN coating extends tool life compared to uncoated HSS by reducing friction and heat buildup during cutting. Its straight cylindrical shank accepts standard drill chucks without adapters. Primary workpiece materials listed for this bit are cast iron and steel, making it well suited for structural steel work, equipment maintenance, and light production drilling.

Key Features

• High-speed steel construction with titanium nitride coating for extended wear life in ferrous materials
• 118-degree standard point angle for general-purpose drilling in cast iron and steel
• Right-hand cut with regular spiral fluting and a tapered, web-thinned point to reduce thrust and improve chip evacuation
• Straight cylindrical shank (1/4 inches diameter) fits standard drill chucks directly
• Meets DIN 338 standard for jobber-length drill bits
• 2-flute design for efficient chip clearance in typical metalworking applications

Compatibility

Designed as an OEM-style general-purpose jobber drill bit suitable for use in standard 3-jaw drill chucks accommodating a 1/4-inch straight shank. Primary workpiece materials are cast iron and steel as specified by the manufacturer.

Installation Notes

Secure the shank fully in the drill chuck before operation and verify the chuck is tightened with a chuck key before starting the spindle. Power down the drill press or disconnect the tool before changing bits. Use appropriate cutting fluid or coolant when drilling steel to manage heat, even though this bit is not coolant-through rated. Always wear eye protection and secure workpieces in a vise or fixture to prevent rotation during drilling.