Chicago-latrobe 48742 Screw Machine Drill Bit Hss

Product Description

The CHICAGO-LATROBE 48742 is a screw machine length drill bit designed for high-volume drilling in metalworking and machining applications. Built from high speed steel with a bright/uncoated finish, it features a standard 118-degree split point and a right-hand spiral flute for efficient chip evacuation. The straight cylindrical shank fits standard drill chucks without modification. At 1-3/4 inches overall length with a 3/4-inch flute length, this stub-style bit offers added rigidity compared to jobber-length alternatives, reducing deflection in short-hole drilling operations. The web-thinned parallel web construction reduces thrust and improves hole entry. Diameter tolerance is held to +0.0000 to -0.0005 inches.

The 48742 is suited for production drilling in cast iron, non-ferrous metals, and steel. Its screw machine length makes it a practical choice for turret lathes, automatic screw machines, CNC machining centers, and drill presses where a shorter cutting tool improves stability and precision. Wire gauge size 42 corresponds to a 0.0935-inch diameter, commonly used in precision tapping pilot holes and close-tolerance through-hole work in light manufacturing and tool-and-die environments. The general purpose grade and ISO compliance make it a standard-stocked option across machine shops and fabrication facilities.

Key Features

• Wire size 42 (0.0935 inches) with diameter tolerance of +0.0000 to -0.0005 inches
• High speed steel construction for general purpose metal cutting
• 118-degree standard point angle with web-thinned tip to reduce entry thrust
• Screw machine (stub) length at 1-3/4 inches overall for improved rigidity
• Right-hand cut, regular spiral flute for consistent chip removal
• Bright/uncoated finish suitable for cutting oils and standard coolants
• ISO-compliant Series 157 construction

Compatibility

Designed for use in cast iron, non-ferrous metals, and steel. Compatible with standard straight-shank drill chucks on drill presses, turret lathes, CNC machining centers, and automatic screw machines requiring a stub-length bit in wire gauge size 42.

Installation Notes

Installation and use should be performed by a qualified machinist or tool operator. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck. Secure the straight cylindrical shank firmly in the chuck to the full depth of the jaws to prevent slippage under load. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole tolerance.