Chicago-latrobe 48227 Screw Machine Drill Bit 27/64 in Hss

Product Description

The CHICAGO-LATROBE 48227 is a screw machine length drill bit engineered for heavy-duty drilling in cast iron and steel. It measures 27/64 inch (0.4200 inch) in diameter with an overall length of 3-3/8 inches and a flute length of 2 inches. The bit is manufactured from high speed steel with a coated finish for added wear resistance. A 135-degree split point reduces walking on entry and lowers thrust requirements compared to a standard 118-degree point. Web thinning with a parallel web configuration further improves chip clearance and cutting efficiency. This is a professional-grade tool suited for machine shop and trade applications where consistent hole quality in ferrous materials is required.

The 48227 is designed for screw machine length applications where a shorter, stiffer bit is preferred over jobber length. Its reduced overhang improves rigidity, making it well suited for drill press, CNC machining center, and production drilling operations. Primary workpiece materials are cast iron and steel. The straight cylindrical shank is compatible with standard drill chucks and collet holders. Series 2159 indicates this bit conforms to CHICAGO-LATROBE heavy-duty specifications and meets NAS 907 and ISO standards for dimensional accuracy.

Key Features

• 27/64 inch diameter with a tight tolerance of +0.0000 to -0.0010 inch for precise hole sizing
• 135-degree split point with web thinning reduces thrust and prevents bit walking
• High speed steel construction with coated finish for extended tool life in ferrous materials
• Screw machine length body provides added rigidity over standard jobber length bits
• Regular spiral, 2-flute configuration promotes efficient chip evacuation
• Meets NAS 907 and ISO standards; Series 2159 heavy-duty designation

Compatibility

Designed for drilling cast iron and steel workpieces. The straight cylindrical shank fits standard drill chucks and collet systems used in drill presses, lathes, and CNC machining centers that accept 27/64 inch shank tooling.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotary cutting tools. Secure the shank fully in the chuck or collet and verify concentricity before operation. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life, noting that this bit does not support coolant-through delivery.