Chicago-latrobe 49106 Screw Machine Drill Bit 0.1065in Lh

Product Description

The CHICAGO-LATROBE 49106 is a screw machine length, left-hand cut drill bit designed for high-speed steel performance in general-purpose drilling applications. Built to Series 157L specifications, it measures 0.1065 inches in diameter (Wire Size 36) with an overall length of 1-13/16 inches and a flute length of 13/16 inches. The bright, uncoated finish suits a range of base materials. The 118-degree standard point angle and web-thinned, parallel-web construction reduce thrust force and improve chip evacuation. This bit is typically installed and operated by machinists, maintenance technicians, and trade professionals working with portable or stationary drilling equipment.

The 49106 is suited for drilling into non-ferrous and softer materials including aluminum, copper, magnesium, slate, thermoplastic, and wood. The screw machine length body — shorter than a jobber-length bit — provides added rigidity and reduced deflection in close-tolerance work, turret lathe setups, and screw machine operations. The left-hand spiral flute is specifically useful in reverse-rotation applications, such as extracting broken fasteners or drilling with left-hand spindles.

Key Features

• Left-hand cut spiral flute for reverse-rotation and broken fastener extraction applications
• 118-degree standard point angle with web-thinned, parallel-web design for reduced thrust
• Screw machine length body (1-13/16 inches overall) provides rigidity and minimizes deflection
• High speed steel construction for general-purpose durability across a range of workpiece materials
• Bright, uncoated finish — no coating to chip or peel during regrinding
• Diameter tolerance of +0.0000 to -0.0005 inches for consistent, repeatable hole sizing

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard straight-shank drill chucks on portable drills, drill presses, turret lathes, and screw machines. Compatible with workpiece materials including aluminum, copper, magnesium, slate, thermoplastic, and wood per manufacturer specifications.

Installation Notes

This bit is installed and operated by machinists or trade professionals familiar with drilling equipment and left-hand rotation setups. Secure the straight-cylindrical shank firmly in a keyed or keyless chuck before operation. Verify spindle rotation direction matches the left-hand cut geometry before starting the machine. Use appropriate cutting fluid for the workpiece material where applicable, and ensure the workpiece is clamped securely to prevent movement during drilling.