Chicago-latrobe 49419 Screw Machine Drill Bit 0.073 in

Product Description

The CHICAGO-LATROBE 49419 is a screw machine length drill bit engineered for high-productivity drilling in metal fabrication and maintenance applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned parallel web construction that reduces walking and lowers thrust on entry. At 0.073 inches in diameter (Wire Size 49), it falls within the 0.0000 to 0.1000 inch decimal range and holds a tight diameter tolerance of +0.0000 to -0.0005 inches. The compact screw machine length body makes it well suited for drill presses, CNC turret lathes, and close-clearance hand drilling where a jobber-length bit would interfere.

This bit is intended for right-hand cutting in cast iron and steel workpieces. The screw machine length format — with a flute length of 11/16 inches and an overall length of 1-11/16 inches — provides added rigidity compared to standard jobber-length bits, making it a practical choice for production shops, machine shops, and field maintenance environments. It is sold individually but requires a minimum order of 12 units. The Series 159 designation and NAS 907 specification classify it as a heavy-duty grade bit built to ISO standards.

Key Features

• 135-degree split point reduces drill walking and decreases required thrust at the workpiece surface
• Web-thinned parallel web design improves chip evacuation and extends cutting life in steel and cast iron
• Screw machine length body increases rigidity versus jobber-length bits in close-clearance setups
• Tight diameter tolerance of +0.0000 to -0.0005 inches supports precision hole sizing
• High speed steel construction with coated finish for improved wear resistance
• Meets NAS 907 and ISO standards; classified as heavy-duty grade

Compatibility

Designed as an OEM-style replacement or direct-use bit for standard straight-shank drill chucks and collet holders accepting a 0.073 inch cylindrical shank. Primary workpiece materials listed by the manufacturer are cast iron and steel.

Installation Notes

Install in a drill chuck or collet holder rated for the shank diameter and confirm secure seating before operation. Secure the workpiece firmly to prevent movement during drilling. Use appropriate cutting fluid or coolant when drilling steel to manage heat buildup; note this bit does not support coolant-through delivery. Inspect the split point for wear or chipping before each use and replace the bit if the cutting edge is compromised.