Chicago-latrobe 48561 Screw Machine Drill Bit 61/64 in Hss

Product Description

The CHICAGO-LATROBE 48561 is a screw machine length drill bit designed for general-purpose drilling in metal fabrication and machining environments. Built from high speed steel with a coated finish, it measures 0.9531 inches (61/64 inch) in diameter and features a 118-degree standard point angle with web thinning for reduced thrust at entry. The straight-cylindrical shank and regular spiral flute geometry keep the bit stable in chuck-style holders. At 5.875 inches overall length with a 3.875-inch flute length, this is a stub-length configuration that offers greater rigidity than jobber-length bits, making it well suited for drilling on manual mills, drill presses, and screw machine applications.

The 48561 is rated for use in cast iron, non-ferrous metals, and steel, covering the primary workpiece materials common in job shops, maintenance facilities, and production environments. The two-flute spiral design promotes chip evacuation during through-hole and blind-hole operations. Series 157 bits are positioned as a general-purpose tool, appropriate for operators who need consistent performance across a range of material hardnesses without specialty coatings or point geometries. No coolant-through capability is present, so external cutting fluid or dry cutting applies depending on the workpiece material and machine setup.

Key Features

• 61/64 inch (0.9531 inch) diameter with a tight tolerance of +0.0000 to -0.0012 inches
• 118-degree standard point angle with web thinning for reduced entry thrust
• High speed steel construction with coated finish for improved wear resistance
• Screw machine (stub) length for increased rigidity over jobber-length bits
• Right-hand cut, two-flute regular spiral design promotes consistent chip removal
• ISO standards compliance; suitable for cast iron, non-ferrous metals, and steel

Compatibility

Designed as an OEM-style replacement or direct-fit screw machine drill bit for standard straight-shank chuck holders used in drill presses, manual mills, and screw machine setups where a stub-length bit in the 0.6000-inch-and-above diameter range is specified.

Installation Notes

Installation is performed by machining professionals or maintenance technicians using a standard drill press, milling machine, or screw machine with a compatible chuck. Secure the straight-cylindrical shank fully in the chuck to the recommended grip depth before operation. Apply appropriate cutting fluid for ferrous workpieces unless dry cutting is specified for the material. Inspect the cutting edges and web condition before each use; a worn or damaged point reduces hole quality and increases thrust load on the spindle.