Chicago-latrobe 48757 Screw Machine Drill Bit 0.043 in

Product Description

The CHICAGO-LATROBE 48757 is a screw machine length drill bit designed for high-speed steel drilling in general-purpose metalworking applications. Built from high speed steel (HSS) with a bright, uncoated finish, this bit measures 0.043 inches in diameter and corresponds to wire gauge size 57. It features a 118-degree standard point angle and a spiral flute configuration with a right-hand cutting direction. The shorter screw machine length body provides added rigidity and reduced deflection compared to jobber-length bits, making it well suited for close-tolerance drilling on lathes, drill presses, and screw machine setups.

This bit is intended for use in production and job shop environments where accurate small-diameter holes are required. Typical applications include drilling in cast iron, non-ferrous metals, and steel. The straight-cylindrical shank fits standard chucks without modification. With a parallel web and web-thinned geometry, the 48757 reduces thrust requirements at entry, supporting cleaner hole starts in both manual and automated feed operations. It is a practical choice for machinists, maintenance technicians, and fabricators working with tight-tolerance small-bore requirements.

Key Features

• Wire size 57 designation, 0.043-inch diameter with a tolerance of +0.0000 to -0.0005 inches
• High speed steel construction for general-purpose performance in ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned, parallel web geometry for reduced entry thrust
• Screw machine length body provides greater rigidity than jobber-length equivalents
• Bright, uncoated finish — no coating buildup concerns during regrinding
• Right-hand spiral flute with 2-flute configuration for efficient chip evacuation

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard straight-shank chucks across drill press, lathe turret, and screw machine setups. Suitable for drilling cast iron, non-ferrous metal, and steel workpieces.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians following standard machine tool safety procedures. Ensure the spindle is fully stopped and the machine is de-energized before inserting or removing the bit from the chuck. Confirm the straight-cylindrical shank is fully seated and the chuck is tightened to prevent slippage during operation. Use appropriate cutting fluid or coolant as required by workpiece material, even though this bit does not support through-coolant delivery.