Chicago-latrobe 49209 9/64 in Screw Machine Drill Bit Hss

Product Description

The CHICAGO-LATROBE 49209 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from high speed steel (HSS) with a coated finish, it features a 135-degree split point that reduces walking and lowers thrust on entry. The web-thinned, parallel-web construction supports consistent chip evacuation through spiral flutes. At 0.1406 inches (9/64 inch) in diameter, with a tight tolerance of +0.0000 to -0.0007 inches, this bit delivers precise hole sizing in demanding shop and field applications. Its shorter screw machine length body provides added rigidity compared to jobber-length bits, making it well suited for automated and CNC drilling setups.

This drill bit is rated for heavy-duty performance in ferrous materials, specifically cast iron and steel. The straight-cylindrical shank fits standard drill chucks without adapters. Screw machine length bits like the 49209 are commonly used in turret lathes, screw machines, CNC machining centers, and drill press applications where rigidity and repeatability are priorities. The Series 159 designation identifies this as part of CHICAGO-LATROBE's heavy-duty coated HSS line, built to NAS 907 and ISO standards.

Key Features

• 9/64 inch (0.1406 inch) diameter with tight +0.0000 to -0.0007 inch tolerance
• 135-degree split point reduces thrust and minimizes bit walking on entry
• Web-thinned, parallel-web design promotes chip clearing and extends tool life
• Screw machine length body provides greater rigidity than jobber-length alternatives
• High speed steel with coated finish for improved wear resistance in steel and cast iron
• Meets NAS 907 and ISO standards; Series 159 heavy-duty grade

Compatibility

Designed as a direct-fit replacement or standard tooling selection for screw machines, turret lathes, CNC drilling stations, and drill presses accepting straight-cylindrical shank bits in the 0.1000 to 0.1500 inch diameter range.

Installation Notes

This bit is installed and removed by a licensed machinist or qualified tooling technician using a standard drill chuck or collet sized to accept a straight-cylindrical shank. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify chuck runout and clamping torque per machine manufacturer specifications before beginning a drilling operation. Use appropriate cutting fluid for the workpiece material to maximize bit life and hole quality.