Chicago-latrobe 49123 Screw Machine Drill Bit 0.0595 in

Product Description

The CHICAGO-LATROBE 49123 is a screw machine length drill bit designed for general-purpose drilling in a wide range of materials. Built from high speed steel with a bright, uncoated finish, it measures 0.0595 inches in diameter and features a standard 118-degree point angle. The left-hand spiral flute design and straight-cylindrical shank make this a specialized tool for applications where reverse-rotation extraction or left-hand drilling is required. The shortened screw machine length provides added rigidity over jobber-length bits, reducing deflection in tight or confined drilling setups. Diameter tolerance is held to +0.0000 to -0.0005 inches, consistent with ISO standards.

This bit is suited for trade and machining applications involving aluminum, copper, magnesium, slate, thermoplastic, and wood. The screw machine length format is commonly used in drill press, turret lathe, and CNC work where a shorter, stiffer bit improves hole accuracy and reduces runout. The left-hand cutting direction makes it a practical choice for backing out broken fasteners or for use in left-hand drill configurations. Series 157L positions this bit within a general-purpose line aimed at production and maintenance environments.

Key Features

• Left-hand cutting direction for reverse-rotation and broken-fastener extraction applications
• High speed steel construction with bright, uncoated finish for use across a wide material range
• Screw machine length format provides increased rigidity and reduced deflection vs. jobber-length bits
• 118-degree standard point angle with web-thinned, parallel web configuration
• Diameter tolerance of +0.0000 to -0.0005 inches; meets ISO standards
• 2-flute regular spiral design with 0.625-inch flute length

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard straight-shank drill chucks across drill presses, lathes, and handheld drilling equipment. Suitable for drilling aluminum, copper, magnesium, slate, thermoplastic, and wood per manufacturer specifications.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or tradespeople familiar with proper chuck mounting and drilling procedures. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before operation. Left-hand bits require a reverse-rotation spindle or left-hand drill motor to cut effectively. Inspect the cutting edge for wear or damage before each use and replace if chipping or dullness is observed.