Chicago-latrobe 48247 Screw Machine Drill Bit 0.323 in

Product Description

The CHICAGO-LATROBE 48247 is a screw machine length drill bit engineered for high-productivity metal drilling in industrial and trade applications. Built from high speed steel with a coated finish, it features a 135-degree split point for fast penetration and reduced walking on hard surfaces. The parallel web construction includes web thinning to lower thrust requirements during entry. At 0.323 inches in diameter (letter size P) with a straight-cylindrical shank, this bit fits standard drill chucks and is designed for right-hand cutting with a two-flute regular spiral configuration. Its compact screw machine length provides added rigidity over jobber-length bits, making it well-suited for CNC screw machines, drill presses, and turret lathes.

This bit is rated for primary workpiece materials including cast iron and steel, covering the most common materials encountered in machining, fabrication, and heavy mechanical service. The shortened flute and overall length reduce deflection and improve hole straightness in production drilling environments. Machinists, tool-and-die technicians, and industrial maintenance professionals will find this bit appropriate for high-cycle drilling in ferrous materials. The Series 2159 designation identifies it within the CHICAGO-LATROBE heavy-duty screw machine drill line, and it carries NAS 907 specification compliance under the NAS standard.

Key Features

• 0.323 inch diameter (letter size P) with a diameter tolerance of +0.0000 to -0.0010 inches for precision fitment
• 135-degree split point reduces thrust and prevents bit walking on hard workpieces
• Web-thinned parallel web lowers entry resistance in tough ferrous materials
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Screw machine length body adds rigidity and reduces deflection compared to jobber-length bits
• Meets NAS 907 specification under the NAS standard; ISO-compliant manufacturing

Compatibility

Designed for use in standard straight-shank drill chucks on CNC screw machines, turret lathes, drill presses, and hand-held power drills when drilling cast iron and steel workpieces.

Installation Notes

Installation and use should follow standard machining safety practices: secure the workpiece firmly before drilling and confirm chuck grip on the straight-cylindrical shank is fully seated. Power down and de-energize the machine before changing or inspecting bits. Use appropriate cutting fluid or coolant as recommended by your machine setup, noting this bit does not have coolant-through capability. Disposal of worn HSS tooling should comply with applicable shop waste and sharps-handling procedures.