Chicago-latrobe 48580 Screw Machine Drill Bit 1.25 in Hss

Product Description

The CHICAGO-LATROBE 48580 is a screw machine length drill bit designed for high-volume drilling in metalworking and machining applications. Built from high speed steel (HSS) with a coated finish, it features a 1.25 inch diameter, a 118-degree standard point angle, and a right-hand spiral flute configuration. The shortened screw machine length body provides added rigidity compared to jobber-length bits, reducing deflection in close-clearance setups. At 6.75 inches overall with a 4.375-inch flute length, it fits standard chucks and drilling fixtures used in production environments. Diameter tolerance is held to +0.0000 to -0.0015 inches, meeting ISO standards for precision fit.

This bit is suited for drilling cast iron, non-ferrous metals, and steel in both light manufacturing and job shop environments. The Series 157 designation places it in CHICAGO-LATROBE's general purpose line, making it appropriate for CNC drilling machines, drill presses, and turret lathes where screw machine length tooling is specified. It is a practical choice for machinists and tool-room technicians who need a reliable, off-the-shelf bit for production runs or one-off setups on common ferrous and non-ferrous workpieces.

Key Features

• 1.25 inch diameter with tight tolerance of +0.0000 to -0.0015 inches for accurate hole sizing
• 118-degree standard point angle for general purpose drilling in steel, cast iron, and non-ferrous metals
• High speed steel construction with coated finish for improved wear resistance
• Screw machine length body (6.75 inches overall) provides greater rigidity and reduced deflection
• Right-hand cut, regular spiral, 2-flute design promotes efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without modification

Compatibility

Designed for use in drill presses, CNC machining centers, turret lathes, and other equipment accepting straight-shank tooling with a 1.25 inch diameter bit. Suitable for drilling cast iron, non-ferrous metals, and steel workpieces per Series 157 general purpose specifications.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or toolroom technicians familiar with drilling operations and machine tool safety. Secure the shank fully in the chuck and verify runout before commencing a cut. Power down and de-energize the machine before changing tooling. Always operate within the spindle speed and feed rate limits recommended for the workpiece material and bit diameter to avoid premature wear or breakage.