Chicago-latrobe 48919 19/64 in Hss Screw Machine Drill Bit

Product Description

The CHICAGO-LATROBE 48919 is a screw machine length drill bit designed for left-hand cutting applications in general-purpose drilling operations. Built from high-speed steel (HSS) with a bright uncoated finish, this bit features a 19/64-inch (0.2969 inch) diameter, a standard 118-degree drill point angle, and a regular spiral flute configuration. The screw machine length format provides a shorter, more rigid profile compared to jobber-length bits, reducing deflection and improving hole accuracy in production and repair environments. Web-thinned construction reduces cutting resistance at the tip. Machinists, tool and die technicians, and maintenance trades install this bit in drill presses, lathes, and hand-held drilling equipment.

This bit is suited for drilling aluminum, copper, magnesium, slate, thermoplastic, and wood. The left-hand cutting direction makes it particularly useful for extracting broken right-hand screws and fasteners, as the reverse cutting action can back out a damaged fastener while drilling. Its straight shank and compact overall length of 2-3/4 inches make it compatible with standard drill chucks in both benchtop and portable equipment. This is a single-piece package intended for individual replacement or stock.

Key Features

• Left-hand cut direction aids broken fastener removal during reverse drilling
• HSS construction provides durability across a range of non-ferrous and soft materials
• 118-degree standard drill point angle for general-purpose entry performance
• Web-thinned tip reduces thrust force and improves penetration efficiency
• Screw machine length (2-3/4 inches OAL) delivers increased rigidity over jobber-length bits
• Bright uncoated finish maintains sharp edges and allows easy visual inspection for wear

Compatibility

The 48919 belongs to CHICAGO-LATROBE Series 157L and is rated for use in aluminum, copper, magnesium, slate, thermoplastic, and wood. It fits any standard drill chuck accepting a 0.2969-inch straight shank.

Installation Notes

Installation is performed by machinists, maintenance technicians, or trade professionals operating drill presses, CNC equipment, or hand drills. Ensure the drill chuck is fully tightened and the workpiece is securely fixtured before operation. When using a left-hand bit for fastener extraction, confirm the drilling equipment is set to reverse rotation before engaging the bit. Inspect the cutting edges before each use and replace bits that show chipping or heat discoloration.