Chicago-latrobe 50835 Cobalt Screw Machine Drill Bit 0.257 in

Product Description

The CHICAGO-LATROBE 50835 is a cobalt screw machine length drill bit designed for heavy-duty drilling in ferrous metals, cast iron, and steel. It carries a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to standard 118-degree geometry. The web-thinned, parallel web configuration supports consistent chip evacuation through two spiral flutes. At 2-5/8 inches overall length with a 1-7/16-inch flute length, this stubby-profile bit fits drill presses and CNC applications where rigidity is critical. It is manufactured from M42 cobalt high-speed steel, giving it heat resistance suitable for interrupted cuts and abrasive workpieces. The straight-cylindrical shank seats directly in standard drill chucks without adapters.

This bit is sized at letter F (0.2570 inches decimal equivalent) and falls within the 0.2500 to 0.3000 inch diameter range of the Series 559 line. It is suited for production-floor and maintenance environments where short-length bits are preferred to reduce deflection in hard materials. Right-hand cutting direction and regular spiral flute geometry make it compatible with conventional drill press and hand drill setups targeting cast iron and steel workpieces. HVAC fabricators, pipefitters, millwrights, and metal fabricators routinely reach for this geometry when drilling pilot holes, tap-prep holes, or clearance holes in structural steel and cast components.

Key Features

• M42 cobalt steel construction provides heat and wear resistance in hard and abrasive metals
• 135-degree split point reduces center-punch dependency and lowers entry thrust
• Web-thinned parallel web improves chip flow and reduces heat buildup at the cutting edge
• Screw machine length (2-5/8 inches overall) maximizes rigidity and minimizes deflection
• Diameter tolerance of +0.0000 to -0.0010 inches ensures consistent hole sizing for tapping and clearance fits
• ISO-standard geometry for compatibility with production tooling systems

Compatibility

Designed for use in steel and cast iron workpieces as an OEM-style production drill bit in the CHICAGO-LATROBE Series 559 heavy-duty cobalt line. No specific machine model compatibility was stated by the manufacturer for this SKU.

Installation Notes

Secure the straight-cylindrical shank firmly in a keyed or keyless drill chuck rated for the intended spindle speed before operation. Reduce spindle RPM and increase feed pressure when drilling cast iron or hardened steel to prevent work-hardening at the cut surface. Apply cutting fluid or a compatible metalworking lubricant to extend edge life, particularly in deep-hole applications. Inspect the split point for chipping or wear before each use and replace the bit when diameter tolerance can no longer be maintained.