Chicago-latrobe 48917 Screw Machine Drill Bit 17/64 Hss

Product Description

The CHICAGO-LATROBE 48917 is a screw machine length drill bit designed for general-purpose drilling in a wide range of materials. It features a 17/64 inch (0.2656 inch) diameter, a standard 118-degree point angle, and is manufactured from high-speed steel (HSS) with a bright uncoated finish. The left-hand cut configuration makes it particularly useful for removing broken fasteners and for operations where reverse-rotation drilling is required. With an overall length of 2-5/8 inches and a straight shank, this bit fits standard drill chucks and is sized for close-quarters and short-reach applications common in production and maintenance work.

This bit is suited for drilling aluminum, copper, magnesium, slate, thermoplastic, and wood. Its screw machine length body keeps the bit rigid in tight spaces, making it a common choice for drill press work, CNC setups, and manual operations on the bench or in the field. The straight shank and compact overall length allow it to seat securely in standard chucks without extensions. General-purpose machinists, maintenance technicians, and production shops will find this bit useful for everyday left-hand drilling tasks across non-ferrous and non-metallic materials.

Key Features

• Left-hand cut direction for reverse-rotation drilling and broken fastener extraction
• HSS construction provides durability across non-ferrous metals, thermoplastics, and wood
• 118-degree standard point angle for general-purpose entry and centering
• Screw machine length body (2-5/8 inches OAL) adds rigidity in tight or short-reach setups
• Web-thinned, parallel web configuration reduces thrust and improves chip clearance
• Diameter tolerance of +0.0000 to -0.0010 inches meets ISO standards for consistent hole sizing

Compatibility

Designed as a general-purpose screw machine length left-hand drill bit in the CHICAGO-LATROBE Series 157L, suitable for standard straight-shank drill chucks accepting a 0.2656 inch shank diameter. Primary workpiece materials include aluminum, copper, magnesium, slate, thermoplastic, and wood.

Installation Notes

This bit is installed by machinists, maintenance technicians, and tool-and-die professionals using standard drill presses, lathes, or hand drills configured for left-hand (reverse) rotation. Ensure the chuck and spindle are fully stopped before inserting or removing the bit. Secure the shank fully in the chuck to the rated depth to prevent runout. Left-hand bits require the drilling machine to operate in reverse; confirm rotation direction before beginning any operation.