Chicago-latrobe 48237 Screw Machine Drill Bit 0.257 in Hss

Product Description

The CHICAGO-LATROBE 48237 is a screw machine length drill bit designed for heavy-duty drilling in cast iron and steel. Built from high speed steel (HSS) with a coated finish, it features a 135-degree split point that reduces walking and requires less feed pressure at start. The stub-length body is stiffer than jobber-length bits, making it well suited for drill press work and production environments where rigidity and hole accuracy matter. At 0.257 inches in diameter (Letter F), it holds a tight tolerance of +0.0000 to -0.0010 inches. Two spiral flutes with web thinning and a parallel web configuration promote chip evacuation and reduce torque in tougher materials.

This bit is used in production machining, maintenance shops, and fabrication environments where short, rigid tooling is preferred. It is rated for ferrous materials including cast iron and steel. The straight-cylindrical shank fits standard drill chucks and collet-style holders without modification. Screw machine length bits like this one are a common choice on drill presses, milling machine setups, and CNC applications requiring reduced runout and improved hole straightness. It is sold individually and packaged as a single unit.

Key Features

• 135-degree split point reduces bit walking and lowers entry force on hard materials
• Web-thinned, parallel web design reduces torque and improves chip flow
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Screw machine (stub) length provides greater rigidity than jobber-length bits
• Right-hand cut with 2 regular spiral flutes for consistent chip evacuation
• Meets NAS 907 and ISO standards for dimensional accuracy and tool performance

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for production drilling applications in cast iron and steel. Fits any standard drill chuck or collet holder accepting a straight-cylindrical shank at 0.257 inches diameter.

Installation Notes

Installation of this bit is performed by machinists, tool-and-die tradespeople, and maintenance technicians. Secure the shank fully in the chuck or collet before operation and verify runout with a dial indicator on precision work. Power down and lock out the machine before changing bits. Do not exceed the recommended speed and feed range for the workpiece material and bit diameter.